Answer in brief
CVE-2026-80977 records a High severity (CVSS 7.8) vulnerability in net: skbuff: don't touch shared zerocopy state in skb_tx_error(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <15aa81b390d401abf4b8211042470e9e92e3b7fb || >=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <288f9970670841044ab030104fa6b6ed159949d0 || >=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <0370da114a9bc044e248b85c6809d1b5e0c1f7f9 || >=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <f66bdb1cc0fcd227a062378f8be0b5873aa5600a | 15aa81b390d401abf4b8211042470e9e92e3b7fb, 288f9970670841044ab030104fa6b6ed159949d0, 0370da114a9bc044e248b85c6809d1b5e0c1f7f9, f66bdb1cc0fcd227a062378f8be0b5873aa5600a |
| Linux/Linuxgeneric | 3.8 | Not reported |
| Linux/Linuxgeneric | >=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <6493165034bca14033bf49c9cec7b45e97a91497 || >=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <b4452349dcf4d561e13be768d5d278de58248930 || >=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <363c4252ffc473a0203e91b83ede5519dfb8bd07 || >=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <6ec22afc82a3cae07ade0a6ec361ae2532128ff5 || >=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <15aa81b390d401abf4b8211042470e9e92e3b7fb || >=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <288f9970670841044ab030104fa6b6ed159949d0 || >=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <0370da114a9bc044e248b85c6809d1b5e0c1f7f9 || >=25121173f7b1e4ac3fc692df6e7b8c52ec36abba <f66bdb1cc0fcd227a062378f8be0b5873aa5600a | 6493165034bca14033bf49c9cec7b45e97a91497, b4452349dcf4d561e13be768d5d278de58248930, 363c4252ffc473a0203e91b83ede5519dfb8bd07, 6ec22afc82a3cae07ade0a6ec361ae2532128ff5, 15aa81b390d401abf4b8211042470e9e92e3b7fb, 288f9970670841044ab030104fa6b6ed159949d0, 0370da114a9bc044e248b85c6809d1b5e0c1f7f9, f66bdb1cc0fcd227a062378f8be0b5873aa5600a |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.