CVE-2026-80977
Description
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.
How to fix
- Linux Linux6493165034bca14033bf49c9cec7b45e97a91497, b4452349dcf4d561e13be768d5d278de58248930, 363c4252ffc473a0203e91b83ede5519dfb8bd07, 6ec22afc82a3cae07ade0a6ec361ae2532128ff5, 15aa81b390d401abf4b8211042470e9e92e3b7fb, 288f9970670841044ab030104fa6b6ed159949d0, 0370da114a9bc044e248b85c6809d1b5e0c1f7f9, f66bdb1cc0fcd227a062378f8be0b5873aa5600a or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 25121173f7b1e4ac3fc692df6e7b8c52ec36abba ≤ v < 6493165034bca14033bf49c9cec7b45e97a91497, 25121173f7b1e4ac3fc692df6e7b8c52ec36abba ≤ v < b4452349dcf4d561e13be768d5d278de58248930, 25121173f7b1e4ac3fc692df6e7b8c52ec36abba ≤ v < 363c4252ffc473a0203e91b83ede5519dfb8bd07, 25121173f7b1e4ac3fc692df6e7b8c52ec36abba ≤ v < 6ec22afc82a3cae07ade0a6ec361ae2532128ff5, 25121173f7b1e4ac3fc692df6e7b8c52ec36abba ≤ v < 15aa81b390d401abf4b8211042470e9e92e3b7fb, 25121173f7b1e4ac3fc692df6e7b8c52ec36abba ≤ v < 288f9970670841044ab030104fa6b6ed159949d0, 25121173f7b1e4ac3fc692df6e7b8c52ec36abba ≤ v < 0370da114a9bc044e248b85c6809d1b5e0c1f7f9, 25121173f7b1e4ac3fc692df6e7b8c52ec36abba ≤ v < f66bdb1cc0fcd227a062378f8be0b5873aa5600a, 3.8 | 6493165034bca14033bf49c9cec7b45e97a91497, b4452349dcf4d561e13be768d5d278de58248930, 363c4252ffc473a0203e91b83ede5519dfb8bd07, 6ec22afc82a3cae07ade0a6ec361ae2532128ff5, 15aa81b390d401abf4b8211042470e9e92e3b7fb, 288f9970670841044ab030104fa6b6ed159949d0, 0370da114a9bc044e248b85c6809d1b5e0c1f7f9, f66bdb1cc0fcd227a062378f8be0b5873aa5600a |
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