CVE-2025-21860

Publication date 12 March 2025

Last updated 12 March 2025

Ubuntu priority

Medium

Why this priority?

In the Linux kernel, the following vulnerability has been resolved: mm/zswap: fix inconsistency when zswap_store_page() fails Commit b7c0ccdfbafd ("mm: zswap: support large folios in zswap_store()") skips charging any zswap entries when it failed to zswap the entire folio. However, when some base pages are zswapped but it failed to zswap the entire folio, the zswap operation is rolled back. When freeing zswap entries for those pages, zswap_entry_free() uncharges the zswap entries that were not previously charged, causing zswap charging to become inconsistent. This inconsistency triggers two warnings with following steps: # On a machine with 64GiB of RAM and 36GiB of zswap $ stress-ng --bigheap 2 # wait until the OOM-killer kills stress-ng $ sudo reboot The two warnings are: in mm/memcontrol.c:163, function obj_cgroup_release(): WARN_ON_ONCE(nr_bytes & (PAGE_SIZE - 1)); in mm/page_counter.c:60, function page_counter_cancel(): if (WARN_ONCE(new < 0, "page_counter underflow: %ld nr_pages=%lu\n", new, nr_pages)) zswap_stored_pages also becomes inconsistent in the same way. As suggested by Kanchana, increment zswap_stored_pages and charge zswap entries within zswap_store_page() when it succeeds. This way, zswap_entry_free() will decrement the counter and uncharge the entries when it failed to zswap the entire folio. While this could potentially be optimized by batching objcg charging and incrementing the counter, let's focus on fixing the bug this time and leave the optimization for later after some evaluation. After resolving the inconsistency, the warnings disappear. [[email protected]: refactor zswap_store_page()] Link: https://lkml.kernel.org/r/[email protected]

Status

Package Ubuntu Release Status
linux 24.10 oracular
Needs evaluation
24.04 LTS noble
Needs evaluation
22.04 LTS jammy
Needs evaluation
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
linux-allwinner-5.19 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored end of kernel support
20.04 LTS focal Not in release
linux-aws 24.10 oracular
Needs evaluation
24.04 LTS noble
Needs evaluation
22.04 LTS jammy
Needs evaluation
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
linux-aws-5.0 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic Ignored superseded by linux-aws-5.3
linux-aws-5.11 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Ignored superseded by linux-aws-5.13
linux-aws-5.13 24.10 oracular Not in release
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20.04 LTS focal Ignored superseded by linux-aws-5.15
linux-aws-5.15 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal
Needs evaluation
linux-aws-5.19 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored superseded by linux-aws-6.2
20.04 LTS focal Not in release
linux-aws-5.3 24.10 oracular Not in release
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18.04 LTS bionic Ignored superseded by linux-aws-5.4
linux-aws-5.4 24.10 oracular Not in release
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22.04 LTS jammy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Needs evaluation
linux-aws-5.8 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Ignored superseded by linux-aws-5.11
linux-aws-6.2 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored superseded by linux-aws-6.5
20.04 LTS focal Not in release
linux-aws-6.5 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored superseded by linux-aws-6.8
20.04 LTS focal Not in release
linux-aws-6.8 24.10 oracular Not in release
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22.04 LTS jammy
Needs evaluation
20.04 LTS focal Not in release
linux-aws-fips 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
20.04 LTS focal FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
18.04 LTS bionic FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
linux-aws-hwe 24.10 oracular Not in release
24.04 LTS noble Not in release
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16.04 LTS xenial
Needs evaluation
linux-azure 24.10 oracular
Needs evaluation
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Needs evaluation
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Needs evaluation
18.04 LTS bionic Ignored superseded by linux-azure-5.3
16.04 LTS xenial
Needs evaluation
linux-azure-4.15 24.10 oracular Not in release
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18.04 LTS bionic
Needs evaluation
linux-azure-5.11 24.10 oracular Not in release
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20.04 LTS focal Ignored superseded by linux-azure-5.13
linux-azure-5.13 24.10 oracular Not in release
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linux-azure-5.15 24.10 oracular Not in release
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Needs evaluation
linux-azure-5.19 24.10 oracular Not in release
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linux-azure-5.3 24.10 oracular Not in release
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18.04 LTS bionic Ignored superseded by linux-azure-5.4
linux-azure-5.4 24.10 oracular Not in release
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Needs evaluation
linux-azure-5.8 24.10 oracular Not in release
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linux-azure-6.2 24.10 oracular Not in release
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linux-azure-6.5 24.10 oracular Not in release
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linux-azure-6.8 24.10 oracular Not in release
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Needs evaluation
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linux-azure-edge 24.10 oracular Not in release
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18.04 LTS bionic Ignored superseded by linux-azure-5.3
linux-azure-fde 24.10 oracular Not in release
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Needs evaluation
20.04 LTS focal Ignored superseded by linux-azure-fde-5.15
linux-azure-fde-5.15 24.10 oracular Not in release
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Needs evaluation
linux-azure-fde-5.19 24.10 oracular Not in release
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linux-azure-fde-6.2 24.10 oracular Not in release
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linux-azure-fips 24.10 oracular Not in release
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22.04 LTS jammy FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
20.04 LTS focal FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
18.04 LTS bionic FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
linux-bluefield 24.10 oracular Not in release
24.04 LTS noble Not in release
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Needs evaluation
linux-fips 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
20.04 LTS focal FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
18.04 LTS bionic FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
16.04 LTS xenial FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
linux-gcp 24.10 oracular
Needs evaluation
24.04 LTS noble
Needs evaluation
22.04 LTS jammy
Needs evaluation
20.04 LTS focal
Needs evaluation
18.04 LTS bionic Ignored superseded by linux-gcp-5.3
16.04 LTS xenial
Needs evaluation
linux-gcp-4.15 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Needs evaluation
linux-gcp-5.11 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Ignored superseded by linux-gcp-5.13
linux-gcp-5.13 24.10 oracular Not in release
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20.04 LTS focal Ignored superseded by linux-gcp-5.15
linux-gcp-5.15 24.10 oracular Not in release
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20.04 LTS focal
Needs evaluation
linux-gcp-5.19 24.10 oracular Not in release
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22.04 LTS jammy Ignored superseded by linux-gcp-6.2
20.04 LTS focal Not in release
linux-gcp-5.3 24.10 oracular Not in release
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18.04 LTS bionic Ignored superseded by linux-gcp-5.4
linux-gcp-5.4 24.10 oracular Not in release
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20.04 LTS focal Not in release
18.04 LTS bionic
Needs evaluation
linux-gcp-5.8 24.10 oracular Not in release
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20.04 LTS focal Ignored superseded by linux-gcp-5.11
linux-gcp-6.2 24.10 oracular Not in release
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22.04 LTS jammy Ignored superseded by linux-gcp-6.5
20.04 LTS focal Not in release
linux-gcp-6.5 24.10 oracular Not in release
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linux-gcp-6.8 24.10 oracular Not in release
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Needs evaluation
20.04 LTS focal Not in release
linux-gcp-fips 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
20.04 LTS focal FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
18.04 LTS bionic FIPS Updates FIPS compliant package with security fixes. Available with Ubuntu Pro.
Needs evaluation
linux-gke 24.10 oracular Not in release
24.04 LTS noble
Needs evaluation
22.04 LTS jammy
Needs evaluation
20.04 LTS focal Ignored end of kernel support
linux-gke-4.15 24.10 oracular Not in release
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18.04 LTS bionic Ignored superseded by linux-gke-5.0
linux-gke-5.15 24.10 oracular Not in release
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20.04 LTS focal Ignored end of kernel support
linux-gke-5.4 24.10 oracular Not in release
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20.04 LTS focal Not in release
18.04 LTS bionic Ignored end of kernel support
linux-gkeop 24.10 oracular Not in release
24.04 LTS noble
Needs evaluation
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Needs evaluation
20.04 LTS focal Ignored end of kernel support
linux-gkeop-5.15 24.10 oracular Not in release
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20.04 LTS focal Ignored end of kernel support
linux-gkeop-5.4 24.10 oracular Not in release
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18.04 LTS bionic Ignored end of kernel support
linux-hwe 24.10 oracular Not in release
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18.04 LTS bionic Ignored replaced by linux-hwe-5.4
16.04 LTS xenial
Needs evaluation
linux-hwe-5.11 24.10 oracular Not in release
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linux-hwe-5.13 24.10 oracular Not in release
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linux-hwe-5.15 24.10 oracular Not in release
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Needs evaluation
linux-hwe-5.19 24.10 oracular Not in release
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linux-hwe-5.4 24.10 oracular Not in release
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18.04 LTS bionic
Needs evaluation
linux-hwe-5.8 24.10 oracular Not in release
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linux-hwe-6.11 24.10 oracular Not in release
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Needs evaluation
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linux-hwe-6.2 24.10 oracular Not in release
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linux-hwe-6.5 24.10 oracular Not in release
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Needs evaluation
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linux-hwe-edge 24.10 oracular Not in release
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18.04 LTS bionic Ignored superseded by linux-hwe-5.4
16.04 LTS xenial Ignored superseded by linux-hwe
linux-ibm 24.10 oracular Not in release
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Needs evaluation
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Needs evaluation
linux-ibm-5.15 24.10 oracular Not in release
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linux-ibm-5.4 24.10 oracular Not in release
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Needs evaluation
linux-intel-5.13 24.10 oracular Not in release
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linux-intel-iot-realtime 24.10 oracular Not in release
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Needs evaluation
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linux-intel-iotg-5.15 24.10 oracular Not in release
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Needs evaluation
linux-iot 24.10 oracular Not in release
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linux-kvm 24.10 oracular Not in release
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18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
linux-lowlatency 24.10 oracular
Needs evaluation
24.04 LTS noble
Needs evaluation
22.04 LTS jammy
Needs evaluation
20.04 LTS focal Not in release
linux-lowlatency-hwe-5.15 24.10 oracular Not in release
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20.04 LTS focal
Needs evaluation
linux-lowlatency-hwe-5.19 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored superseded by linux-lowlatency-hwe-6.2
20.04 LTS focal Not in release
linux-lowlatency-hwe-6.11 24.10 oracular Not in release
24.04 LTS noble
Needs evaluation
22.04 LTS jammy Not in release
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linux-lowlatency-hwe-6.2 24.10 oracular Not in release
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22.04 LTS jammy Ignored superseded by linux-lowlatency-hwe-6.5
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linux-lowlatency-hwe-6.5 24.10 oracular Not in release
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22.04 LTS jammy Ignored superseded by linux-lowlatency-hwe-6.8
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linux-lowlatency-hwe-6.8 24.10 oracular Not in release
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linux-lts-xenial 24.10 oracular Not in release
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linux-nvidia 24.10 oracular Not in release
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Needs evaluation
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linux-nvidia-6.2 24.10 oracular Not in release
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linux-nvidia-6.8 24.10 oracular Not in release
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linux-nvidia-lowlatency 24.10 oracular Not in release
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22.04 LTS jammy Not in release
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linux-oem 24.10 oracular Not in release
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18.04 LTS bionic Ignored replaced by linux-hwe-5.4
linux-oem-5.10 24.10 oracular Not in release
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20.04 LTS focal Ignored superseded by linux-oem-5.13
linux-oem-5.13 24.10 oracular Not in release
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linux-oem-5.14 24.10 oracular Not in release
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linux-oem-5.17 24.10 oracular Not in release
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linux-oem-5.6 24.10 oracular Not in release
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linux-oem-6.0 24.10 oracular Not in release
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linux-oem-6.1 24.10 oracular Not in release
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linux-oem-6.11 24.10 oracular Not in release
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linux-oem-6.5 24.10 oracular Not in release
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linux-oem-6.8 24.10 oracular Not in release
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linux-oracle 24.10 oracular
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linux-oracle-5.0 24.10 oracular Not in release
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linux-oracle-5.3 24.10 oracular Not in release
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linux-oracle-5.4 24.10 oracular Not in release
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linux-oracle-5.8 24.10 oracular Not in release
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linux-raspi 24.10 oracular
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linux-raspi-5.4 24.10 oracular Not in release
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linux-raspi-realtime 24.10 oracular Not in release
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linux-raspi2 24.10 oracular Not in release
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linux-realtime 24.10 oracular
Needs evaluation
24.04 LTS noble
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linux-riscv 24.10 oracular
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24.04 LTS noble
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22.04 LTS jammy Ignored end of kernel support
20.04 LTS focal Ignored superseded by linux-riscv-5.8
linux-riscv-5.11 24.10 oracular Not in release
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20.04 LTS focal Ignored superseded by linux-riscv-5.13
linux-riscv-5.15 24.10 oracular Not in release
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linux-riscv-5.19 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored end of kernel support
20.04 LTS focal Not in release
linux-riscv-5.8 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Ignored superseded by linux-riscv-5.11
linux-riscv-6.5 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored superseded by linux-riscv-6.8
20.04 LTS focal Not in release
linux-riscv-6.8 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy
Needs evaluation
20.04 LTS focal Not in release
linux-starfive-5.19 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored end of kernel support
20.04 LTS focal Not in release
linux-starfive-6.2 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored superseded by linux-starfive-6.5
20.04 LTS focal Not in release
linux-starfive-6.5 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Ignored end of kernel support
20.04 LTS focal Not in release
linux-xilinx-zynqmp 24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy
Needs evaluation
20.04 LTS focal
Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
linux