Integer Overflow or Wraparound Affecting kernel-rt package, versions <0:5.14.0-427.35.1.el9_4
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Test your applications- Snyk ID SNYK-ALMALINUX9-KERNELRT-8340067
- published 4 Nov 2024
- disclosed 11 Sep 2024
Introduced: 11 Sep 2024
CVE-2024-42131 Open this link in a new tabHow to fix?
Upgrade AlmaLinux:9 kernel-rt to version 0:5.14.0-427.35.1.el9_4 or higher.
This issue was patched in ALSA-2024:6567.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt package and not the kernel-rt package as distributed by AlmaLinux.
See How to fix? for AlmaLinux:9 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
mm: avoid overflows in dirty throttling logic
The dirty throttling logic is interspersed with assumptions that dirty limits in PAGE_SIZE units fit into 32-bit (so that various multiplications fit into 64-bits). If limits end up being larger, we will hit overflows, possible divisions by 0 etc. Fix these problems by never allowing so large dirty limits as they have dubious practical value anyway. For dirty_bytes / dirty_background_bytes interfaces we can just refuse to set so large limits. For dirty_ratio / dirty_background_ratio it isn't so simple as the dirty limit is computed from the amount of available memory which can change due to memory hotplug etc. So when converting dirty limits from ratios to numbers of pages, we just don't allow the result to exceed UINT_MAX.
This is root-only triggerable problem which occurs when the operator sets dirty limits to >16 TB.
References
- https://errata.almalinux.org/9/ALSA-2024-6567.html
- https://errata.almalinux.org/8/ALSA-2024-7000.html
- https://errata.almalinux.org/8/ALSA-2024-7001.html
- https://access.redhat.com/security/cve/CVE-2024-42131
- https://access.redhat.com/errata/RHSA-2024:6567
- https://access.redhat.com/errata/RHSA-2024:7000
- https://access.redhat.com/errata/RHSA-2024:7001
- https://git.kernel.org/stable/c/2b2d2b8766db028bd827af34075f221ae9e9efff
- https://git.kernel.org/stable/c/4d3817b64eda07491bdd86a234629fe0764fb42a
- https://git.kernel.org/stable/c/385d838df280eba6c8680f9777bfa0d0bfe7e8b2
- https://git.kernel.org/stable/c/7a49389771ae7666f4dc3426e2a4594bf23ae290
- https://git.kernel.org/stable/c/8e0b5e7f2895eccef5c2a0018b589266f90c4805
- https://git.kernel.org/stable/c/a25e8536184516b55ef89ab91dd2eea429de28d2
- https://git.kernel.org/stable/c/bd16a7ee339aef3ee4c90cb23902afb6af379ea0
- https://git.kernel.org/stable/c/c83ed422c24f0d4b264f89291d4fabe285f80dbc