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CVE-2025-39689ftrace: Also allocate and copy hash for reading of filter files

Description

In the Linux kernel, the following vulnerability has been resolved: ftrace: Also allocate and copy hash for reading of filter files Currently the reader of set_ftrace_filter and set_ftrace_notrace just adds the pointer to the global tracer hash to its iterator. Unlike the writer that allocates a copy of the hash, the reader keeps the pointer to the filter hashes. This is problematic because this pointer is static across function calls that release the locks that can update the global tracer hashes. This can cause UAF and similar bugs. Allocate and copy the hash for reading the filter files like it is done for the writers. This not only fixes UAF bugs, but also makes the code a bit simpler as it doesn't have to differentiate when to free the iterator's hash between writers and readers.

Timeline

  1. ID reserved

    By Linux

  2. · 5 months later

    Published

  3. · 14 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-2025-39689, 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 · Modified3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.19% · top 91% of all CVEs (12 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
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 c20489dad156dd9919ebd854bbace46dbd2576a3 – < 12064e1880fc9202be75ff668205b1703d92f74f
    • affected c20489dad156dd9919ebd854bbace46dbd2576a3 – < c4cd93811e038d19f961985735ef7bb128078dfb
    • affected c20489dad156dd9919ebd854bbace46dbd2576a3 – < e0b6b223167e1edde5c82edf38e393c06eda1f13
    • affected c20489dad156dd9919ebd854bbace46dbd2576a3 – < a40c69f4f1ed96acbcd62e9b5ff3a596f0a91309
    • affected c20489dad156dd9919ebd854bbace46dbd2576a3 – < 3b114a3282ab1a12cb4618a8f45db5d7185e784a
    • affected c20489dad156dd9919ebd854bbace46dbd2576a3 – < c591ba1acd081d4980713e47869dd1cc3d963d19
    • affected c20489dad156dd9919ebd854bbace46dbd2576a3 – < 64db338140d2bad99a0a8c6a118dd60b3e1fb8cb
    • affected c20489dad156dd9919ebd854bbace46dbd2576a3 – < bfb336cf97df7b37b2b2edec0f69773e06d11955

  • Linux · Linux

    • affected 4.12
    • unaffected < 4.12
    • unaffected 5.4.297 – ≤ 5.4.*
    • unaffected 5.10.241 – ≤ 5.10.*
    • unaffected 5.15.190 – ≤ 5.15.*
    • unaffected 6.1.149 – ≤ 6.1.*
    • unaffected 6.6.103 – ≤ 6.6.*
    • unaffected 6.12.44 – ≤ 6.12.*
    • unaffected 6.16.4 – ≤ 6.16.*
    • unaffected 6.17 – ≤ *

References

References12

Sources

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

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Record last updated .