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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-46300

net: skbuff: preserve shared-frag marker during coalescing

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same externally-owned or page-cache-backed frags, but the shared-frag marker is currently lost. That breaks the invariant relied on by later in-place writers. In particular, ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skb_has_shared_frag() as false and decrypt in place over page-cache backed frags. Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged frags. The tailroom copy path does not need the marker because it copies bytes into @to's linear data rather than transferring frag descriptors.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < 3599e6b3cc1ada96883d496a50a210d3afbb6987affected
  • cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < 2f2b16022a2e10ca7bccfb98db5ed2ec0f72641caffected
  • cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < 9d3e5fd19fe1063bf607219e8562fbd567b8e8d5affected
  • cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < 78bf6b6bb19541d19fbda6242e7cfe2c682763c0affected
  • cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < 760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34eaffected
  • cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < 3bd9e113d50034db99d7ef69fd8e5242d15e414aaffected
  • cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < 3884358a9286b17f389a72b1426fc4547c23c111affected
  • cef401de7be8c4e155c6746bfccf721a4fa5fab9 to < f84eca5817390257cef78013d0112481c503b4a3affected

Linux Linux

Default version status: affected

  • 3.9affected
  • 0 to < 3.9unaffected
  • 5.10.257 to ≤ 5.10.*unaffected
  • 5.15.208 to ≤ 5.15.*unaffected
  • 6.1.174 to ≤ 6.1.*unaffected
  • 6.6.141 to ≤ 6.6.*unaffected
  • 6.12.91 to ≤ 6.12.*unaffected
  • 6.18.33 to ≤ 6.18.*unaffected
  • 7.0.10 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References