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CVE-2026-46331

net/sched: fix pedit partial COW leading to page cache corruption

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: fix pedit partial COW leading to page cache corruption tcf_pedit_act() computes the COW range for skb_ensure_writable() once before the key loop using tcfp_off_max_hint, but the hint does not account for the runtime header offset added by typed keys. This can leave part of the write region un-COW'd. Fix by moving skb_ensure_writable() inside the per-key loop where the actual write offset is known, and add overflow checking on the offset arithmetic. For negative offsets (e.g. Ethernet header edits at ingress), use skb_cow() to COW the headroom instead. Guard offset_valid() against INT_MIN, where negation is undefined.

Public exploit

An exploit or proof of concept is public: anyone can try it against an unpatched system. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.

Show the exploits1

References tagged exploit1 reference

Timeline

  1. ID reserved

    By Linux

  2. · 34 days later

    Published

  3. · 4 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-2026-46331, 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
redhat-SADPADP (enrichment)3.1Medium6.7CVSS:3.1/AV:L/AC:L/PR:H/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)
0.64% · top 49% of all CVEs (9 Nov 2026)
CISA SSVC
Exploitation: poc · 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 abe35bf3be51482593076d516a680d79e5fbc8e1 – < 544d857b42a1734b923040e13aa61a6fd4746cf2
    • affected b773640d5bb9e2acfd91e2695717af04d47aa116 – < d5d01d35a5a7d36f7cb679b67d9cbdd5205672dc
    • affected 8b796475fd7882663a870456466a4fb315cc1bd6 – < a071e057518decc5e3bec89855758f5f8786f2c5
    • affected 8b796475fd7882663a870456466a4fb315cc1bd6 – < b685d6ef6f07a3b5ce814565a25f39f2157538a5
    • affected 8b796475fd7882663a870456466a4fb315cc1bd6 – < 2bec122b9fb91507a758ab5e3e5c4fbe7cb3f61b
    • affected 8b796475fd7882663a870456466a4fb315cc1bd6 – < b198ed4e52580a7238c7c7082f03906f8b310313
    • affected 8b796475fd7882663a870456466a4fb315cc1bd6 – < 3dee9d0c198faeb95d052c1b94c2958751a28512
    • affected 8b796475fd7882663a870456466a4fb315cc1bd6 – < 899ee91156e57784090c5565e4f31bd7dbffbc5a
    • affected d0c38a914b0c4c21d553da801003d36979016726
    • affected 2ec2dd7d51a9320151f275ddbb2b53260fb32ca1
    • affected c19cc520b3d69904e9518d401ad0df7f4702aca0
    • affected 5.10.117 – < 5.10.260
    • affected 5.15.41 – < 5.15.211
    • affected 4.19.244 – < 4.20
    • affected 5.4.195 – < 5.5
    • affected 5.17.9 – < 5.18

  • Linux · Linux

    • affected 5.18
    • unaffected < 5.18
    • unaffected 5.10.260 – ≤ 5.10.*
    • unaffected 5.15.211 – ≤ 5.15.*
    • unaffected 6.1.177 – ≤ 6.1.*
    • unaffected 6.6.144 – ≤ 6.6.*
    • unaffected 6.12.94 – ≤ 6.12.*
    • unaffected 6.18.36 – ≤ 6.18.*
    • unaffected 7.0.13 – ≤ 7.0.*
    • unaffected 7.1 – ≤ *

References

45

Sources

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

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Record last updated .