Description
In the Linux kernel, the following vulnerability has been resolved: net: smc: fix splice entry lifetime imbalance in smc_rx_splice smc_rx_splice() passes pages to splice_to_pipe() before taking the references that cover the lifetime of each splice entry. In the VM-backed RMB path, splice_to_pipe() may drop unqueued entries through smc_rx_spd_release(), while queued entries are released later via the pipe buffer callback. The old post-splice accounting also derives the number of queued VM pages from an offset mutated while building the descriptor, and a multi-page splice pairs one sock_hold() with multiple sock_put() calls. Take the page and socket references for every candidate entry before splice_to_pipe(), and drop the matching private state, page reference, and socket reference from smc_rx_spd_release() for entries that never get queued. This fixes a refcount imbalance that can underflow page refcounts and trigger a use-after-free.
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
9014db202cb764b8e14c53e7bacc81f9a1a2ba7f to < 7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cbaffected9014db202cb764b8e14c53e7bacc81f9a1a2ba7f to < 07ad246529d136d5ef441d5ab4c305d132ff3090affected9014db202cb764b8e14c53e7bacc81f9a1a2ba7f to < c841789e456ec6751342fa800639ce8e82ff0e6baffected9014db202cb764b8e14c53e7bacc81f9a1a2ba7f to < af02c67ce654356c58db20a0bb2db33ace3b07a8affected9014db202cb764b8e14c53e7bacc81f9a1a2ba7f to < ca8342b5fc24c249fdb998468f6a168b457c67e5affected9014db202cb764b8e14c53e7bacc81f9a1a2ba7f to < 0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0affected9014db202cb764b8e14c53e7bacc81f9a1a2ba7f to < 4515c78f4d9fd577270f012efeb062ea58b3682daffected9014db202cb764b8e14c53e7bacc81f9a1a2ba7f to < 5d9686af2976741bbd79b150d1c9e60b81e7f12eaffected
Linux Linux
Default version status: affected
4.18affected0 to < 4.18unaffected5.10.266 to ≤ 5.10.*unaffected5.15.217 to ≤ 5.15.*unaffected6.1.183 to ≤ 6.1.*unaffected6.6.152 to ≤ 6.6.*unaffected6.12.104 to ≤ 6.12.*unaffected6.18.45 to ≤ 6.18.*unaffected7.1.9 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb ↗
- https://git.kernel.org/stable/c/07ad246529d136d5ef441d5ab4c305d132ff3090 ↗
- https://git.kernel.org/stable/c/c841789e456ec6751342fa800639ce8e82ff0e6b ↗
- https://git.kernel.org/stable/c/af02c67ce654356c58db20a0bb2db33ace3b07a8 ↗
- https://git.kernel.org/stable/c/ca8342b5fc24c249fdb998468f6a168b457c67e5 ↗
- https://git.kernel.org/stable/c/0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0 ↗
- https://git.kernel.org/stable/c/4515c78f4d9fd577270f012efeb062ea58b3682d ↗
- https://git.kernel.org/stable/c/5d9686af2976741bbd79b150d1c9e60b81e7f12e ↗