CVE-2026-99284net: skbuff: propagate shared-frag marker in skb_zerocopy()
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 89% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In 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.
Timeline
ID reserved
By Linux
- 43 days later
· 43 days later
Published
- 3 days later
· 3 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.21% · top 89% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected af2806f8f90a150160be898cd85332459c83c5cb – < fe8477e23dd2ee6bce231d65f2586a333b211dc0
- affected af2806f8f90a150160be898cd85332459c83c5cb – < 1c623e3cbf43f12dd4a72712079bfa247a9b8ba3
- affected af2806f8f90a150160be898cd85332459c83c5cb – < d7d6ff98d5d1b400f02211f962ac32cc0020aeab
- affected af2806f8f90a150160be898cd85332459c83c5cb – < 1a9c180cd8435917b7516edfb1c9148032c28773
- affected af2806f8f90a150160be898cd85332459c83c5cb – < 79dc34beb1fdb3da79753e51e15c68591a2561fe
- affected 3.14
- unaffected < 3.14
- unaffected 6.12.117 – ≤ 6.12.*
- unaffected 6.18.61 – ≤ 6.18.*
- unaffected 7.2.15 – ≤ 7.2.*
- unaffected 7.3.2 – ≤ 7.3.*
- unaffected 7.4-rc1 – ≤ *
References
References5
- https://git.kernel.org/stable/c/fe8477e23dd2ee6bce231d65f2586a333b211dc0 (opens in a new tab)
- https://git.kernel.org/stable/c/1c623e3cbf43f12dd4a72712079bfa247a9b8ba3 (opens in a new tab)
- https://git.kernel.org/stable/c/d7d6ff98d5d1b400f02211f962ac32cc0020aeab (opens in a new tab)
- https://git.kernel.org/stable/c/1a9c180cd8435917b7516edfb1c9148032c28773 (opens in a new tab)
- https://git.kernel.org/stable/c/79dc34beb1fdb3da79753e51e15c68591a2561fe (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-119329 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-99284)Record last updated .