Use After Free The advisory has been revoked - it doesn't affect any version of package kernel-doc (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL8-KERNELDOC-6983913
- published22 May 2024
- disclosed21 May 2024
Introduced: 21 May 2024
CVE-2021-47388 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:8.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-doc package and not the kernel-doc package as distributed by RHEL.
In the Linux kernel, the following vulnerability has been resolved:
mac80211: fix use-after-free in CCMP/GCMP RX
When PN checking is done in mac80211, for fragmentation we need to copy the PN to the RX struct so we can later use it to do a comparison, since commit bf30ca922a0c ("mac80211: check defrag PN against current frame").
Unfortunately, in that commit I used the 'hdr' variable without it being necessarily valid, so use-after-free could occur if it was necessary to reallocate (parts of) the frame.
Fix this by reloading the variable after the code that results in the reallocations, if any.
This fixes https://bugzilla.kernel.org/show_bug.cgi?id=214401.
References
- https://access.redhat.com/security/cve/CVE-2021-47388
- https://git.kernel.org/stable/c/27d3eb5616ee2c0a3b30c3fa34813368ed1f3dc9
- https://git.kernel.org/stable/c/31de381aef0ab1b342f62485118dc8a19363dc78
- https://git.kernel.org/stable/c/3d5d629c99c468458022e9b381789de3595bf4dd
- https://git.kernel.org/stable/c/447d001b875d0e7f211c4ba004916028da994258
- https://git.kernel.org/stable/c/50149e0866a82cef33e680ee68dc380a5bc75d32
- https://git.kernel.org/stable/c/57de2dcb18742dc2860861c9f496da7d42b67da0
- https://git.kernel.org/stable/c/94513069eb549737bcfc3d988d6ed4da948a2de8
- https://git.kernel.org/stable/c/f556e1d6fb9f2923a9a36f3df638c7d79ba09dbb