High 7.8Published Sep 11, 2026

CVE-2026-80977net: skbuff: don't touch shared zerocopy state in skb_tx_error()

Updated under an hour ago (2026-10-19 10:10 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: don't touch shared zerocopy state in skb_tx_error() skb_tx_error() completes the zerocopy uarg and clears SKBFL_ALL_ZEROCOPY, and skb_zcopy_downgrade_managed() clears SKBFL_MANAGED_FRAG_REFS. Both live in skb_shinfo(), which every clone shares, while the caller only owns the reference it is about to drop. Through a clone it tells the producer its pages are free and drops SKBFL_SHARED_FRAG for an skb that is still in flight. Open vSwitch reaches this with a non-last OVS_ACTION_ATTR_RECIRC: clone_execute() sends a skb_clone() into ovs_dp_process_packet() while do_execute_actions() keeps forwarding the original, and skb_clone() does not privatise the frags here -- skb_orphan_frags() returns early on SKBFL_DONT_ORPHAN. A flow miss on the clone then strips the marker from the packet still being forwarded, and a later local ESP delivery decrypts in place over frags it does not own privately. Skip it for a cloned skb. Nothing is lost: skb_release_data() clears the zerocopy state once the last reference to the shared data goes.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 25121173f7b1e4ac3fc692df6e7b8c52ec36abba before 6493165034bca14033bf49c9cec7b45e97a91497; from 25121173f7b1e4ac3fc692df6e7b8c52ec36abba before b4452349dcf4d561e13be768d5d278de58248930; 25121173f7b1e4ac3fc692df6e7b8c52ec36abba builds before 363c4252ffc473a0203e91b83ede5519dfb8bd07; 25121173f7b1e4ac3fc692df6e7b8c52ec36abba builds before 6ec22afc82a3cae07ade0a6ec361ae2532128ff5; 25121173f7b1e4ac3fc692df6e7b8c52ec36abba builds before 15aa81b390d401abf4b8211042470e9e92e3b7fb; 25121173f7b1e4ac3fc692df6e7b8c52ec36abba builds before 288f9970670841044ab030104fa6b6ed159949d0; 25121173f7b1e4ac3fc692df6e7b8c52ec36abba builds before 0370da114a9bc044e248b85c6809d1b5e0c1f7f9; from 25121173f7b1e4ac3fc692df6e7b8c52ec36abba before f66bdb1cc0fcd227a062378f8be0b5873aa5600a	CNA record

References

https://git.kernel.org/stable/c/6493165034bca14033bf49c9cec7b45e97a91497
https://git.kernel.org/stable/c/b4452349dcf4d561e13be768d5d278de58248930
https://git.kernel.org/stable/c/363c4252ffc473a0203e91b83ede5519dfb8bd07
https://git.kernel.org/stable/c/6ec22afc82a3cae07ade0a6ec361ae2532128ff5
https://git.kernel.org/stable/c/15aa81b390d401abf4b8211042470e9e92e3b7fb
https://git.kernel.org/stable/c/288f9970670841044ab030104fa6b6ed159949d0
https://git.kernel.org/stable/c/0370da114a9bc044e248b85c6809d1b5e0c1f7f9
https://git.kernel.org/stable/c/f66bdb1cc0fcd227a062378f8be0b5873aa5600a

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.