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

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.

Timeline

  1. ID reserved

    By Linux

  2. · 14 days later

    Published

  3. · 2 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-46100, by who scored it
Scored byCVSSScoreVector
LinuxCNA (assigner)3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Analyzed3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.14% · top 97% of all CVEs (15 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Affected products

  • Linux · Linux

    • affected 9d5403b1036cdcd4be0f9f5568612c0e60e73d79 – < f51f85c044809fbd39ac8ae07ac99bc43ce32bd5
    • affected 9d5403b1036cdcd4be0f9f5568612c0e60e73d79 – < 48c7a0eaeea41da17d1d84d2d7a4c40be122b246
    • affected 9d5403b1036cdcd4be0f9f5568612c0e60e73d79 – < fbfc6578eaca12daa0c09df1e9ba7f2c657b49da

  • Linux · Linux

    • affected 6.17
    • unaffected < 6.17
    • unaffected 6.18.27 – ≤ 6.18.*
    • unaffected 7.0.4 – ≤ 7.0.*
    • unaffected 7.1 – ≤ *

References

References3

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .