net: skbuff: propagate shared-frag marker in skb_zerocopy()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99284
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-07 21:17:00 UTC
Updated2026-11-10 19:22:31 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: skbuff: propagate shared-frag marker in skb_zerocopy() skb_zerocopy() moves frag descriptors from @from into @to and takes a reference on each frag, but it does not copy skb_shinfo(from)->flags into skb_shinfo(to)->flags. A destination skb holding the same page-cache backed frags as the source therefore reports skb_has_shared_frag() as false. That breaks the invariant relied on by later in-place writers. ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(); with the marker lost, an skb that skb_zerocopy() built for nfnetlink_queue or for an openvswitch upcall is decrypted in place, letting an unprivileged user write into the page cache of a root-owned read-only file. Propagate SKBFL_SHARED_FRAG when frag descriptors are copied, as done for the other frag-transfer helpers.

Risk And Classification

EPSS: 0.002090000 probability, percentile 0.111590000 (date 2026-11-10)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected af2806f8f90a150160be898cd85332459c83c5cb fe8477e23dd2ee6bce231d65f2586a333b211dc0 git Not specified
CNA Linux Linux affected af2806f8f90a150160be898cd85332459c83c5cb 1c623e3cbf43f12dd4a72712079bfa247a9b8ba3 git Not specified
CNA Linux Linux affected af2806f8f90a150160be898cd85332459c83c5cb d7d6ff98d5d1b400f02211f962ac32cc0020aeab git Not specified
CNA Linux Linux affected af2806f8f90a150160be898cd85332459c83c5cb 1a9c180cd8435917b7516edfb1c9148032c28773 git Not specified
CNA Linux Linux affected af2806f8f90a150160be898cd85332459c83c5cb 79dc34beb1fdb3da79753e51e15c68591a2561fe git Not specified
CNA Linux Linux affected 3.14 Not specified
CNA Linux Linux unaffected 3.14 semver Not specified
CNA Linux Linux unaffected 6.12.117 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.61 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.15 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3.2 7.3.* semver Not specified
CNA Linux Linux unaffected 7.4-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1c623e3cbf43f12dd4a72712079bfa247a9b8ba3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1a9c180cd8435917b7516edfb1c9148032c28773 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fe8477e23dd2ee6bce231d65f2586a333b211dc0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/79dc34beb1fdb3da79753e51e15c68591a2561fe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d7d6ff98d5d1b400f02211f962ac32cc0020aeab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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