CVE-2024-38580 Affecting kernel-rt-debug package, versions <0:5.14.0-427.28.1.el9_4
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Test your applications- Snyk ID SNYK-ALMALINUX9-KERNELRTDEBUG-8330437
- published 4 Nov 2024
- disclosed 31 Jul 2024
Introduced: 31 Jul 2024
CVE-2024-38580 Open this link in a new tabHow to fix?
Upgrade AlmaLinux:9 kernel-rt-debug to version 0:5.14.0-427.28.1.el9_4 or higher.
This issue was patched in ALSA-2024:4928.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug package and not the kernel-rt-debug 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:
epoll: be better about file lifetimes
epoll can call out to vfs_poll() with a file pointer that may race with the last 'fput()'. That would make f_count go down to zero, and while the ep->mtx locking means that the resulting file pointer tear-down will be blocked until the poll returns, it means that f_count is already dead, and any use of it won't actually get a reference to the file any more: it's dead regardless.
Make sure we have a valid ref on the file pointer before we call down to vfs_poll() from the epoll routines.
References
- https://errata.almalinux.org/9/ALSA-2024-4928.html
- https://access.redhat.com/security/cve/CVE-2024-38580
- https://access.redhat.com/errata/RHSA-2024:4928
- https://git.kernel.org/stable/c/16e3182f6322575eb7c12e728ad3c7986a189d5d
- https://git.kernel.org/stable/c/4efaa5acf0a1d2b5947f98abb3acf8bfd966422b
- https://git.kernel.org/stable/c/4f65f4defe4e23659275ce5153541cd4f76ce2d2
- https://git.kernel.org/stable/c/559214eb4e5c3d05e69428af2fae2691ba1eb784
- https://git.kernel.org/stable/c/cbfd1088e24ec4c1199756a37cb8e4cd0a4b016e