Description
In the Linux kernel, the following vulnerability has been resolved: atm: Revert atm_account_tx() if copy_from_iter_full() fails. In vcc_sendmsg(), we account skb->truesize to sk->sk_wmem_alloc by atm_account_tx(). It is expected to be reverted by atm_pop_raw() later called by vcc->dev->ops->send(vcc, skb). However, vcc_sendmsg() misses the same revert when copy_from_iter_full() fails, and then we will leak a socket. Let's factorise the revert part as atm_return_tx() and call it in the failure path. Note that the corresponding sk_wmem_alloc operation can be found in alloc_tx() as of the blamed commit. $ git blame -L:alloc_tx net/atm/common.c c55fa3cccbc2c~
Product status
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 5e0d00992118e234ebf29d5145c1cc920342777e
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before c12430edd92fd49a4800b0f3fb395b50cb16bcc1
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 287b4f085d2ca3375cf1ee672af27410c64777e8
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 2252c539c43f9a1431a7e8b34e3c18e9dd77a96d
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 3902205eadf35db59dbc2186c2a98b9e6182efa5
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 3d828519bd69bfcaabdd942a872679617ef06739
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 7d6bc28cfe5c8e3a279b4b4bdeed6698b2702685
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 7851263998d4269125fd6cb3fdbfc7c6db853859
2.6.12
Any version before 2.6.12
5.4.295 (semver)
5.10.239 (semver)
5.15.186 (semver)
6.1.142 (semver)
6.6.95 (semver)
6.12.35 (semver)
6.15.4 (semver)
6.16 (original_commit_for_fix)
References
lists.debian.org/debian-lts-announce/2025/10/msg00008.html
lists.debian.org/debian-lts-announce/2025/10/msg00007.html
git.kernel.org/...c/5e0d00992118e234ebf29d5145c1cc920342777e
git.kernel.org/...c/c12430edd92fd49a4800b0f3fb395b50cb16bcc1
git.kernel.org/...c/287b4f085d2ca3375cf1ee672af27410c64777e8
git.kernel.org/...c/2252c539c43f9a1431a7e8b34e3c18e9dd77a96d
git.kernel.org/...c/3902205eadf35db59dbc2186c2a98b9e6182efa5
git.kernel.org/...c/3d828519bd69bfcaabdd942a872679617ef06739
git.kernel.org/...c/7d6bc28cfe5c8e3a279b4b4bdeed6698b2702685
git.kernel.org/...c/7851263998d4269125fd6cb3fdbfc7c6db853859