CVE-2026-99284
net: skbuff: propagate shared-frag marker in skb_zerocopy()
No known exploitation. No EPSS score yet. Fixed versions are out.
No public exploit knownFix1 product4 fixed builds listed below
No ready-made check. Neither Nuclei nor OpenVAS has one for this CVE yet.
What to do
Find your product and version, then upgrade to the build on the right.
- LinuxAffected: ≥ af2806f8f90a150160be898cd85332459c83c5cb, < 1c623e3cbf43f12dd4a72712079bfa247a9b8ba3Upgrade to: 1c623e3cbf43f12dd4a72712079bfa247a9b8ba3Affected: ≥ af2806f8f90a150160be898cd85332459c83c5cb, < d7d6ff98d5d1b400f02211f962ac32cc0020aeabUpgrade to: d7d6ff98d5d1b400f02211f962ac32cc0020aeabAffected: ≥ af2806f8f90a150160be898cd85332459c83c5cb, < 1a9c180cd8435917b7516edfb1c9148032c28773Upgrade to: 1a9c180cd8435917b7516edfb1c9148032c28773Affected: ≥ af2806f8f90a150160be898cd85332459c83c5cb, < 79dc34beb1fdb3da79753e51e15c68591a2561feUpgrade to: 79dc34beb1fdb3da79753e51e15c68591a2561feStated by: CVE record
Versions as the sources state them. Full version matrix after sign-in
What it is
From the CVE record
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.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
No EPSS score yet. New CVEs are usually scored within a few days.
Lifecycle
2 events over 0 days, from the signal feeds we watch.
- Publishedrecord updated
Affected products
Sources
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