Description
In the Linux kernel, the following vulnerability has been resolved: net: skbuff: don't skb_tx_error() the source skb in skb_zerocopy() skb_zerocopy() copies frags from @from into @to. On an skb_orphan_frags() failure it calls skb_tx_error(@from), a destructive operation on the source skb the copy helper does not own. That completes @from's zerocopy uarg and clears SKBFL_ALL_ZEROCOPY, including the SKBFL_SHARED_FRAG page-ownership marker. Both callers already report the failure on their own drop path. nfnetlink_queue does it at nla_put_failure, and Open vSwitch does it in the flow-miss drop arm of ovs_dp_process_packet(), so nothing is lost by dropping it here. On Open vSwitch's OVS_ACTION_ATTR_USERSPACE path the skb is not freed on this error: do_execute_actions() ignores output_userspace()'s return value and, unless the upcall was the last action, keeps forwarding the same skb through the flow's remaining actions. The uarg is completed while that skb is still in flight, telling the producer its buffers are free, and SKBFL_SHARED_FRAG is cleared on an skb the rest of the stack still handles. That flag is what makes esp_input() call skb_cow_data() instead of decrypting in place, so a later local ESP delivery can decrypt over frags the skb does not own privately. Leave error reporting to the callers.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
36d5fe6a000790f56039afe26834265db0a3ad4c to < 849bdb83123760a865bcb2970127f4c0b9423ba3affected36d5fe6a000790f56039afe26834265db0a3ad4c to < fb10e0e9b220a2eed08931a60dbaad9a2370c908affected36d5fe6a000790f56039afe26834265db0a3ad4c to < 767ec2a65cc022d303b0c9c12811e7db22057341affected36d5fe6a000790f56039afe26834265db0a3ad4c to < 8069643ae64dfdf634b6c78c7f622e5323031436affected36d5fe6a000790f56039afe26834265db0a3ad4c to < 04dd250a78e268af3e7124beb1dc10ec1dd88d60affected36d5fe6a000790f56039afe26834265db0a3ad4c to < a13b1e80e5015cd732440b475c0ef443dc4a2157affected36d5fe6a000790f56039afe26834265db0a3ad4c to < bab5a851e44a3601d31f2aa8043f385bb50ac5d9affected36d5fe6a000790f56039afe26834265db0a3ad4c to < 8ece906150128d5ec2462aabcc978c568433eca4affectedc5f0c0e7525443add533495e93ba8de6feab2396affected1674b4bf3eea3cac51b70778e89f8025f7cfe695affected3.10.51 to < 3.11affected3.12.40 to < 3.13affected
Linux Linux
Default version status: affected
3.14affected0 to < 3.14unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.110 to ≤ 6.12.*unaffected6.18.51 to ≤ 6.18.*unaffected7.2.5 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/849bdb83123760a865bcb2970127f4c0b9423ba3 ↗
- https://git.kernel.org/stable/c/fb10e0e9b220a2eed08931a60dbaad9a2370c908 ↗
- https://git.kernel.org/stable/c/767ec2a65cc022d303b0c9c12811e7db22057341 ↗
- https://git.kernel.org/stable/c/8069643ae64dfdf634b6c78c7f622e5323031436 ↗
- https://git.kernel.org/stable/c/04dd250a78e268af3e7124beb1dc10ec1dd88d60 ↗
- https://git.kernel.org/stable/c/a13b1e80e5015cd732440b475c0ef443dc4a2157 ↗
- https://git.kernel.org/stable/c/bab5a851e44a3601d31f2aa8043f385bb50ac5d9 ↗
- https://git.kernel.org/stable/c/8ece906150128d5ec2462aabcc978c568433eca4 ↗