Out-of-Bounds Affecting kernel-rt package, versions *
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Test your applications- Snyk ID SNYK-RHEL7-KERNELRT-7628483
- published 5 Aug 2024
- disclosed 29 Jul 2024
How to fix?
There is no fixed version for RHEL:7 kernel-rt.
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 RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
s390/mm: Fix VM_FAULT_HWPOISON handling in do_exception()
There is no support for HWPOISON, MEMORY_FAILURE, or ARCH_HAS_COPY_MC on s390. Therefore we do not expect to see VM_FAULT_HWPOISON in do_exception().
However, since commit af19487f00f3 ("mm: make PTE_MARKER_SWAPIN_ERROR more general"), it is possible to see VM_FAULT_HWPOISON in combination with PTE_MARKER_POISONED, even on architectures that do not support HWPOISON otherwise. In this case, we will end up on the BUG() in do_exception().
Fix this by treating VM_FAULT_HWPOISON the same as VM_FAULT_SIGBUS, similar to x86 when MEMORY_FAILURE is not configured. Also print unexpected fault flags, for easier debugging.
Note that VM_FAULT_HWPOISON_LARGE is not expected, because s390 cannot support swap entries on other levels than PTE level.
References
- https://access.redhat.com/security/cve/CVE-2024-41021
- https://git.kernel.org/stable/c/73a9260b7366d2906ec011e100319359fe2277d0
- https://git.kernel.org/stable/c/9e13767ccefdc4f8aa92514b592b60f6b54882ff
- https://git.kernel.org/stable/c/a3aefb871222a9880602d1a44a558177b4143e3b
- https://git.kernel.org/stable/c/df39038cd89525d465c2c8827eb64116873f141a