CVE-2026-46300 (GCVE-0-2026-46300)

Vulnerability from cvelistv5 – Published: 2026-05-23 11:44 – Updated: 2026-05-30 10:49
VLAI
Title
net: skbuff: preserve shared-frag marker during coalescing
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 3599e6b3cc1ada96883d496a50a210d3afbb6987 (git)
Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c (git)
Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 9d3e5fd19fe1063bf607219e8562fbd567b8e8d5 (git)
Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 78bf6b6bb19541d19fbda6242e7cfe2c682763c0 (git)
Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e (git)
Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 3bd9e113d50034db99d7ef69fd8e5242d15e414a (git)
Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < 3884358a9286b17f389a72b1426fc4547c23c111 (git)
Affected: cef401de7be8c4e155c6746bfccf721a4fa5fab9 , < f84eca5817390257cef78013d0112481c503b4a3 (git)
Create a notification for this product.
Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 5.10.257 , ≤ 5.10.* (semver)
Unaffected: 5.15.208 , ≤ 5.15.* (semver)
Unaffected: 6.1.174 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1-rc5 , ≤ * (original_commit_for_fix)
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}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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