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CVE-2026-74631

net: smc: fix splice entry lifetime imbalance in smc_rx_splice

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.266, 5.15.217, 6.1.183, 6.6.152, 6.12.104, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f · fixed in 7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb; From 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f · fixed in 07ad246529d136d5ef441d5ab4c305d132ff3090; From 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f · fixed in c841789e456ec6751342fa800639ce8e82ff0e6b; From 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f · fixed in af02c67ce654356c58db20a0bb2db33ace3b07a8; From 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f · fixed in ca8342b5fc24c249fdb998468f6a168b457c67e5; From 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f · fixed in 0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0; From 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f · fixed in 4515c78f4d9fd577270f012efeb062ea58b3682d; From 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f · fixed in 5d9686af2976741bbd79b150d1c9e60b81e7f12e

  • Linux Linux

    4.18

  • KernelLinux

    From 4.18.0 · fixed in 5.10.266; From 5.11.0 · fixed in 5.15.217; From 5.16.0 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.152; From 6.7.0 · fixed in 6.12.104; From 6.13.0 · fixed in 6.18.45; From 6.19.0 · fixed in 7.1.9

References 8

git.kernel.org