net/9p: fix race condition on rdma->state in trans_rdma.c

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72491
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:23 UTC
Updated2026-08-15 06:22:23 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/9p: fix race condition on rdma->state in trans_rdma.c The rdma->state field is modified without holding req_lock in both recv_done() and p9_cm_event_handler(), while rdma_request() accesses the same field under the req_lock spinlock. This inconsistent locking creates a race condition: - recv_done() running in softirq completion context sets rdma->state = P9_RDMA_FLUSHING without acquiring req_lock - p9_cm_event_handler() modifies rdma->state at multiple points (ADDR_RESOLVED, ROUTE_RESOLVED, ESTABLISHED, CLOSED) without req_lock - rdma_request() uses spin_lock_irqsave(&rdma->req_lock, flags) to protect the read-modify-write of rdma->state The race can cause lost state transitions: recv_done() or the CM event handler could set state to FLUSHING/CLOSED while rdma_request() is concurrently checking or modifying state under the lock, leading to the FLUSHING transition being silently overwritten by CLOSING. This corrupts the connection state machine and can cause use-after-free on RDMA request objects during teardown. Fix by adding req_lock protection to all rdma->state modifications in recv_done() and p9_cm_event_handler(), matching the pattern already used in rdma_request(). Use spin_lock_irqsave/spin_unlock_irqrestore in the CM event handler since it can race with recv_done() which runs in softirq context. Tested with a kernel module that races two threads (simulating rdma_request and recv_done/CM handler) on rdma->state with proper locking: 5.5M+ FLUSHING writes over 27M iterations with 0 lost transitions.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b 4cee2b8766045059d5e0b8114837b4a8efe827ac git Not specified
CNA Linux Linux affected 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b 5424138848eb7d7d8a7196676e90a2cbf2142454 git Not specified
CNA Linux Linux affected 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b 3970a19a80de530b801b6256354d4a529a9a2d6c git Not specified
CNA Linux Linux affected 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b 8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b git Not specified
CNA Linux Linux affected 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b 151f8cf5b23d8a534d884432a82a6d54d5a61989 git Not specified
CNA Linux Linux affected 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b 13bf9879b778b2f4b260b45bed18f31806120d1e git Not specified
CNA Linux Linux affected 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b ebbcbe5c0db215feecc17def06178da443f4eea6 git Not specified
CNA Linux Linux affected 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b 7d54894a1ee265a72d70f7cae1da6cc774cccc71 git Not specified
CNA Linux Linux affected 3479b3c35e82ed10aa0ca2ee9e78c4eded06ba62 git Not specified
CNA Linux Linux affected c01ddaa54d7411e964ffd250c018d8469c5852f2 git Not specified
CNA Linux Linux affected 9e69c673fe077b8dc491cd8406c9bdcb1f76dee2 git Not specified
CNA Linux Linux affected e48e7e27e4dfd00c81e0381e7cee610cce021452 git Not specified
CNA Linux Linux affected 4.4.185 4.5 semver Not specified
CNA Linux Linux affected 4.9.185 4.10 semver Not specified
CNA Linux Linux affected 4.14.132 4.15 semver Not specified
CNA Linux Linux affected 4.19.57 4.20 semver Not specified
CNA Linux Linux affected 4.20 Not specified
CNA Linux Linux unaffected 4.20 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5424138848eb7d7d8a7196676e90a2cbf2142454 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ebbcbe5c0db215feecc17def06178da443f4eea6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/13bf9879b778b2f4b260b45bed18f31806120d1e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4cee2b8766045059d5e0b8114837b4a8efe827ac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3970a19a80de530b801b6256354d4a529a9a2d6c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7d54894a1ee265a72d70f7cae1da6cc774cccc71 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/151f8cf5b23d8a534d884432a82a6d54d5a61989 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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