CVE-2026-46331

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-COWd.

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.

Weakness

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Affected Software

Potential Mitigations

• Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
• If possible, choose a language or compiler that performs automatic bounds checking.
• Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].
• Use libraries or frameworks that make it easier to handle numbers without unexpected consequences.
• Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++). [REF-106]
• Perform input validation on any numeric input by ensuring that it is within the expected range. Enforce that the input meets both the minimum and maximum requirements for the expected range.
• Use unsigned integers where possible. This makes it easier to perform validation for integer overflows. When signed integers are required, ensure that the range check includes minimum values as well as maximum values.
• Understand the programming language’s underlying representation and how it interacts with numeric calculation (CWE-681). Pay close attention to byte size discrepancies, precision, signed/unsigned distinctions, truncation, conversion and casting between types, “not-a-number” calculations, and how the language handles numbers that are too large or too small for its underlying representation. [REF-7]
• Also be careful to account for 32-bit, 64-bit, and other potential differences that may affect the numeric representation.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/92.html

References

• https://git.kernel.org/stable/c/2bec122b9fb91507a758ab5e3e5c4fbe7cb3f61b
• https://git.kernel.org/stable/c/3dee9d0c198faeb95d052c1b94c2958751a28512
• https://git.kernel.org/stable/c/544d857b42a1734b923040e13aa61a6fd4746cf2
• https://git.kernel.org/stable/c/899ee91156e57784090c5565e4f31bd7dbffbc5a
• https://git.kernel.org/stable/c/a071e057518decc5e3bec89855758f5f8786f2c5
• https://git.kernel.org/stable/c/b198ed4e52580a7238c7c7082f03906f8b310313
• https://git.kernel.org/stable/c/b685d6ef6f07a3b5ce814565a25f39f2157538a5
• https://git.kernel.org/stable/c/d5d01d35a5a7d36f7cb679b67d9cbdd5205672dc
• https://access.redhat.com/errata/RHSA-2026:27288
• https://access.redhat.com/errata/RHSA-2026:27353
• https://access.redhat.com/errata/RHSA-2026:27354
• https://access.redhat.com/errata/RHSA-2026:27355
• https://access.redhat.com/errata/RHSA-2026:27704
• https://access.redhat.com/errata/RHSA-2026:27705
• https://access.redhat.com/errata/RHSA-2026:27706
• https://access.redhat.com/errata/RHSA-2026:27707
• https://access.redhat.com/errata/RHSA-2026:27708
• https://access.redhat.com/errata/RHSA-2026:27709
• https://access.redhat.com/errata/RHSA-2026:27713
• https://access.redhat.com/errata/RHSA-2026:27731
• https://access.redhat.com/errata/RHSA-2026:27789
• https://access.redhat.com/errata/RHSA-2026:28887
• https://access.redhat.com/errata/RHSA-2026:28962
• https://access.redhat.com/errata/RHSA-2026:29080
• https://access.redhat.com/errata/RHSA-2026:29794
• https://access.redhat.com/errata/RHSA-2026:29799
• https://access.redhat.com/errata/RHSA-2026:29833
• https://access.redhat.com/errata/RHSA-2026:29856
• https://access.redhat.com/errata/RHSA-2026:29863
• https://access.redhat.com/errata/RHSA-2026:33219
• https://access.redhat.com/errata/RHSA-2026:33220
• https://access.redhat.com/errata/RHSA-2026:33221
• https://access.redhat.com/errata/RHSA-2026:33222
• https://access.redhat.com/errata/RHSA-2026:33223
• https://access.redhat.com/errata/RHSA-2026:33224
• https://access.redhat.com/errata/RHSA-2026:33225
• https://access.redhat.com/errata/RHSA-2026:33666
• https://access.redhat.com/security/cve/CVE-2026-46331
• https://bugzilla.redhat.com/show_bug.cgi?id=2479492
• https://github.com/sgkdev/packet_edit_meme/tree/main
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46331.json