CVE-2026-46331

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxabe35bf3be51482593076d516a680d79e5fbc8e1 < 544d857b42a1734b923040e13aa61a6fd4746cf2affected
LinuxLinuxb773640d5bb9e2acfd91e2695717af04d47aa116 < d5d01d35a5a7d36f7cb679b67d9cbdd5205672dcaffected
LinuxLinux8b796475fd7882663a870456466a4fb315cc1bd6 < a071e057518decc5e3bec89855758f5f8786f2c5affected
LinuxLinux8b796475fd7882663a870456466a4fb315cc1bd6 < b685d6ef6f07a3b5ce814565a25f39f2157538a5affected
LinuxLinux8b796475fd7882663a870456466a4fb315cc1bd6 < 2bec122b9fb91507a758ab5e3e5c4fbe7cb3f61baffected
LinuxLinux8b796475fd7882663a870456466a4fb315cc1bd6 < b198ed4e52580a7238c7c7082f03906f8b310313affected
LinuxLinux8b796475fd7882663a870456466a4fb315cc1bd6 < 3dee9d0c198faeb95d052c1b94c2958751a28512affected
LinuxLinux8b796475fd7882663a870456466a4fb315cc1bd6 < 899ee91156e57784090c5565e4f31bd7dbffbc5aaffected
LinuxLinuxd0c38a914b0c4c21d553da801003d36979016726affected
LinuxLinux2ec2dd7d51a9320151f275ddbb2b53260fb32ca1affected
LinuxLinuxc19cc520b3d69904e9518d401ad0df7f4702aca0affected
LinuxLinux5.10.117 < 5.10.260affected
LinuxLinux5.15.41 < 5.15.211affected
LinuxLinux4.19.244 < 4.20affected
LinuxLinux5.4.195 < 5.5affected
LinuxLinux5.17.9 < 5.18affected
LinuxLinux5.18affected
LinuxLinux0 < 5.18unaffected
LinuxLinux5.10.260 <= 5.10.*unaffected
LinuxLinux5.15.211 <= 5.15.*unaffected
LinuxLinux6.1.177 <= 6.1.*unaffected
LinuxLinux6.6.144 <= 6.6.*unaffected
LinuxLinux6.12.94 <= 6.12.*unaffected
LinuxLinux6.18.36 <= 6.18.*unaffected
LinuxLinux7.0.13 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: total

Additional References

kernel: net/sched: act_pedit: extend the writable skb range per key

Additional References

References