net/smc: fix use-after-free in smc_rx_pipe_buf_release()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80982
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:04 UTC
Updated2026-09-11 20:19:04 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/smc: fix use-after-free in smc_rx_pipe_buf_release() smc_rx_splice() hands RMB pages to a pipe and takes a socket reference per entry so the smc_sock stays alive until the reader finishes. The connection does not: a concurrent close runs smc_conn_free(), which releases the receive buffer back to the link group pool. smc_rx_pipe_buf_release() tests sk_state before taking the socket lock. The state can change between the test and the lock, and smc_rx_update_cons() then dereferences conn->rmb_desc and walks conn->lgr, which smc_conn_free() has already released. On the is_reg_err path smcr_buf_unuse() frees the descriptor outright, so this is a use-after-free. Take the socket lock first and test conn->freed instead. smc_conn_free() sets that flag before releasing anything, and every caller holds the socket lock. The two paths exclude each other: either the pipe release runs first with everything valid, or it sees the flag and skips the update.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f 6a644a7340df978785f3109d1e0726a982ce2c6f git Not specified
CNA Linux Linux affected 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f 0761e49aa78c2f1362511054c6e9670653858837 git Not specified
CNA Linux Linux affected 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f 0926f59ca0f94120895b92180c636a48d0ed3a6d git Not specified
CNA Linux Linux affected 9014db202cb764b8e14c53e7bacc81f9a1a2ba7f c924884743e948e25625b7fbf3ee2a9325a204a7 git Not specified
CNA Linux Linux affected 4.18 Not specified
CNA Linux Linux unaffected 4.18 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0761e49aa78c2f1362511054c6e9670653858837 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c924884743e948e25625b7fbf3ee2a9325a204a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6a644a7340df978785f3109d1e0726a982ce2c6f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0926f59ca0f94120895b92180c636a48d0ed3a6d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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