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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HAffected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < 6493165034bca14033bf49c9cec7b45e97a91497; >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < b4452349dcf4d561e13be768d5d278de58248930; >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < 363c4252ffc473a0203e91b83ede5519dfb8bd07; >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < 6ec22afc82a3cae07ade0a6ec361ae2532128ff5; >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < 15aa81b390d401abf4b8211042470e9e92e3b7fb; >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < 288f9970670841044ab030104fa6b6ed159949d0; >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < 0370da114a9bc044e248b85c6809d1b5e0c1f7f9; >= 25121173f7b1e4ac3fc692df6e7b8c52ec36abba, < f66bdb1cc0fcd227a062378f8be0b5873aa5600a |
| Linux | Linux | 3.8 |
References
- https://git.kernel.org/stable/c/0370da114a9bc044e248b85c6809d1b5e0c1f7f9
- https://git.kernel.org/stable/c/15aa81b390d401abf4b8211042470e9e92e3b7fb
- https://git.kernel.org/stable/c/288f9970670841044ab030104fa6b6ed159949d0
- https://git.kernel.org/stable/c/363c4252ffc473a0203e91b83ede5519dfb8bd07
- https://git.kernel.org/stable/c/6493165034bca14033bf49c9cec7b45e97a91497
- https://git.kernel.org/stable/c/6ec22afc82a3cae07ade0a6ec361ae2532128ff5
- https://git.kernel.org/stable/c/b4452349dcf4d561e13be768d5d278de58248930
- https://git.kernel.org/stable/c/f66bdb1cc0fcd227a062378f8be0b5873aa5600a
Timeline
- Published
- Sep 11, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Received