CVE-2026-80977High· 7.8▾ TwilightIn 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_mana…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 7.4
none → high
— → 7.4
none → high
— → 7.8
none → high
7.8 → 7.4
7.8 → 7
0.2% → 0.2%
7 → 7.8
Last analysed / modified upstream
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.
Linux >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba < 6493165034bca14033bf49c9cec7b45e97a91497Linux >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba < b4452349dcf4d561e13be768d5d278de58248930Linux >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba < 363c4252ffc473a0203e91b83ede5519dfb8bd07Linux >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba < 6ec22afc82a3cae07ade0a6ec361ae2532128ff5Linux >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba < 15aa81b390d401abf4b8211042470e9e92e3b7fbLinux >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba < 288f9970670841044ab030104fa6b6ed159949d0Linux >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba < 0370da114a9bc044e248b85c6809d1b5e0c1f7f9Linux >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba < f66bdb1cc0fcd227a062378f8be0b5873aa5600aLinux 3.8Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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