High 7.8Published May 27, 2026

CVE-2026-46100fs: afs: revert mmap_prepare() change

Updated under an hour ago (Oct 27, 2026, 4:50 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: fs: afs: revert mmap_prepare() change Partially reverts commit 9d5403b1036c ("fs: convert most other generic_file_*mmap() users to .mmap_prepare()"). This is because the .mmap invocation establishes a refcount, but .mmap_prepare is called at a point where a merge or an allocation failure might happen after the call, which would leak the refcount increment. Functionality is being added to permit the use of .mmap_prepare in this case, but in the interim, we need to fix this.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 9d5403b1036cdcd4be0f9f5568612c0e60e73d79 before f51f85c044809fbd39ac8ae07ac99bc43ce32bd5; from 9d5403b1036cdcd4be0f9f5568612c0e60e73d79 before 48c7a0eaeea41da17d1d84d2d7a4c40be122b246; from 9d5403b1036cdcd4be0f9f5568612c0e60e73d79 before fbfc6578eaca12daa0c09df1e9ba7f2c657b49da	CNA record
linux linux_kernel linux:linux_kernel	from 6.17 before 6.18.27; from 6.19 before 7.0.4	NVD

References

References

https://git.kernel.org/stable/c/f51f85c044809fbd39ac8ae07ac99bc43ce32bd5	patch
https://git.kernel.org/stable/c/48c7a0eaeea41da17d1d84d2d7a4c40be122b246	patch
https://git.kernel.org/stable/c/fbfc6578eaca12daa0c09df1e9ba7f2c657b49da	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.