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Vulnerability record · CVE-2026-46100 · published 27 May 2026

CVE-2026-46100: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.17% · top 94.0%
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
25 Jun 2026Last modified by NVD

Description

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:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-46100), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.