{"api_version":"1","generated_at":"2026-08-15T16:26:58+00:00","cve":"CVE-2026-72491","urls":{"html":"https://cve.report/CVE-2026-72491","api":"https://cve.report/api/cve/CVE-2026-72491.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72491","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72491"},"summary":{"title":"net/9p: fix race condition on rdma->state in trans_rdma.c","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/9p: fix race condition on rdma->state in trans_rdma.c\n\nThe rdma->state field is modified without holding req_lock in both\nrecv_done() and p9_cm_event_handler(), while rdma_request() accesses\nthe same field under the req_lock spinlock. This inconsistent locking\ncreates a race condition:\n\n- recv_done() running in softirq completion context sets\n  rdma->state = P9_RDMA_FLUSHING without acquiring req_lock\n\n- p9_cm_event_handler() modifies rdma->state at multiple points\n  (ADDR_RESOLVED, ROUTE_RESOLVED, ESTABLISHED, CLOSED) without\n  req_lock\n\n- rdma_request() uses spin_lock_irqsave(&rdma->req_lock, flags) to\n  protect the read-modify-write of rdma->state\n\nThe race can cause lost state transitions: recv_done() or the CM\nevent handler could set state to FLUSHING/CLOSED while rdma_request()\nis concurrently checking or modifying state under the lock, leading to\nthe FLUSHING transition being silently overwritten by CLOSING. This\ncorrupts the connection state machine and can cause use-after-free on\nRDMA request objects during teardown.\n\nFix by adding req_lock protection to all rdma->state modifications in\nrecv_done() and p9_cm_event_handler(), matching the pattern already\nused in rdma_request(). Use spin_lock_irqsave/spin_unlock_irqrestore\nin the CM event handler since it can race with recv_done() which runs\nin softirq context.\n\nTested with a kernel module that races two threads (simulating\nrdma_request and recv_done/CM handler) on rdma->state with proper\nlocking: 5.5M+ FLUSHING writes over 27M iterations with 0 lost\ntransitions.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:23","updated_at":"2026-08-15 06:22:23"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b","name":"https://git.kernel.org/stable/c/8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5424138848eb7d7d8a7196676e90a2cbf2142454","name":"https://git.kernel.org/stable/c/5424138848eb7d7d8a7196676e90a2cbf2142454","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ebbcbe5c0db215feecc17def06178da443f4eea6","name":"https://git.kernel.org/stable/c/ebbcbe5c0db215feecc17def06178da443f4eea6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/13bf9879b778b2f4b260b45bed18f31806120d1e","name":"https://git.kernel.org/stable/c/13bf9879b778b2f4b260b45bed18f31806120d1e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4cee2b8766045059d5e0b8114837b4a8efe827ac","name":"https://git.kernel.org/stable/c/4cee2b8766045059d5e0b8114837b4a8efe827ac","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3970a19a80de530b801b6256354d4a529a9a2d6c","name":"https://git.kernel.org/stable/c/3970a19a80de530b801b6256354d4a529a9a2d6c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7d54894a1ee265a72d70f7cae1da6cc774cccc71","name":"https://git.kernel.org/stable/c/7d54894a1ee265a72d70f7cae1da6cc774cccc71","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/151f8cf5b23d8a534d884432a82a6d54d5a61989","name":"https://git.kernel.org/stable/c/151f8cf5b23d8a534d884432a82a6d54d5a61989","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72491","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72491","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b 4cee2b8766045059d5e0b8114837b4a8efe827ac git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b 5424138848eb7d7d8a7196676e90a2cbf2142454 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b 3970a19a80de530b801b6256354d4a529a9a2d6c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b 8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.212 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/9p/trans_rdma.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"4cee2b8766045059d5e0b8114837b4a8efe827ac","status":"affected","version":"473c7dd1d7b59ff8f88a5154737e3eac78a96e5b","versionType":"git"},{"lessThan":"5424138848eb7d7d8a7196676e90a2cbf2142454","status":"affected","version":"473c7dd1d7b59ff8f88a5154737e3eac78a96e5b","versionType":"git"},{"lessThan":"3970a19a80de530b801b6256354d4a529a9a2d6c","status":"affected","version":"473c7dd1d7b59ff8f88a5154737e3eac78a96e5b","versionType":"git"},{"lessThan":"8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b","status":"affected","version":"473c7dd1d7b59ff8f88a5154737e3eac78a96e5b","versionType":"git"},{"lessThan":"151f8cf5b23d8a534d884432a82a6d54d5a61989","status":"affected","version":"473c7dd1d7b59ff8f88a5154737e3eac78a96e5b","versionType":"git"},{"lessThan":"13bf9879b778b2f4b260b45bed18f31806120d1e","status":"affected","version":"473c7dd1d7b59ff8f88a5154737e3eac78a96e5b","versionType":"git"},{"lessThan":"ebbcbe5c0db215feecc17def06178da443f4eea6","status":"affected","version":"473c7dd1d7b59ff8f88a5154737e3eac78a96e5b","versionType":"git"},{"lessThan":"7d54894a1ee265a72d70f7cae1da6cc774cccc71","status":"affected","version":"473c7dd1d7b59ff8f88a5154737e3eac78a96e5b","versionType":"git"},{"status":"affected","version":"3479b3c35e82ed10aa0ca2ee9e78c4eded06ba62","versionType":"git"},{"status":"affected","version":"c01ddaa54d7411e964ffd250c018d8469c5852f2","versionType":"git"},{"status":"affected","version":"9e69c673fe077b8dc491cd8406c9bdcb1f76dee2","versionType":"git"},{"status":"affected","version":"e48e7e27e4dfd00c81e0381e7cee610cce021452","versionType":"git"},{"lessThan":"4.5","status":"affected","version":"4.4.185","versionType":"semver"},{"lessThan":"4.10","status":"affected","version":"4.9.185","versionType":"semver"},{"lessThan":"4.15","status":"affected","version":"4.14.132","versionType":"semver"},{"lessThan":"4.20","status":"affected","version":"4.19.57","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/9p/trans_rdma.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.20"},{"lessThan":"4.20","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.261","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.212","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.261","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.212","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"4.20","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4.185","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9.185","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.132","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.57","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/9p: fix race condition on rdma->state in trans_rdma.c\n\nThe rdma->state field is modified without holding req_lock in both\nrecv_done() and p9_cm_event_handler(), while rdma_request() accesses\nthe same field under the req_lock spinlock. This inconsistent locking\ncreates a race condition:\n\n- recv_done() running in softirq completion context sets\n  rdma->state = P9_RDMA_FLUSHING without acquiring req_lock\n\n- p9_cm_event_handler() modifies rdma->state at multiple points\n  (ADDR_RESOLVED, ROUTE_RESOLVED, ESTABLISHED, CLOSED) without\n  req_lock\n\n- rdma_request() uses spin_lock_irqsave(&rdma->req_lock, flags) to\n  protect the read-modify-write of rdma->state\n\nThe race can cause lost state transitions: recv_done() or the CM\nevent handler could set state to FLUSHING/CLOSED while rdma_request()\nis concurrently checking or modifying state under the lock, leading to\nthe FLUSHING transition being silently overwritten by CLOSING. This\ncorrupts the connection state machine and can cause use-after-free on\nRDMA request objects during teardown.\n\nFix by adding req_lock protection to all rdma->state modifications in\nrecv_done() and p9_cm_event_handler(), matching the pattern already\nused in rdma_request(). Use spin_lock_irqsave/spin_unlock_irqrestore\nin the CM event handler since it can race with recv_done() which runs\nin softirq context.\n\nTested with a kernel module that races two threads (simulating\nrdma_request and recv_done/CM handler) on rdma->state with proper\nlocking: 5.5M+ FLUSHING writes over 27M iterations with 0 lost\ntransitions."}],"providerMetadata":{"dateUpdated":"2026-08-15T05:57:26.281Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/4cee2b8766045059d5e0b8114837b4a8efe827ac"},{"url":"https://git.kernel.org/stable/c/5424138848eb7d7d8a7196676e90a2cbf2142454"},{"url":"https://git.kernel.org/stable/c/3970a19a80de530b801b6256354d4a529a9a2d6c"},{"url":"https://git.kernel.org/stable/c/8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b"},{"url":"https://git.kernel.org/stable/c/151f8cf5b23d8a534d884432a82a6d54d5a61989"},{"url":"https://git.kernel.org/stable/c/13bf9879b778b2f4b260b45bed18f31806120d1e"},{"url":"https://git.kernel.org/stable/c/ebbcbe5c0db215feecc17def06178da443f4eea6"},{"url":"https://git.kernel.org/stable/c/7d54894a1ee265a72d70f7cae1da6cc774cccc71"}],"title":"net/9p: fix race condition on rdma->state in trans_rdma.c","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72491","datePublished":"2026-08-15T05:57:26.281Z","dateReserved":"2026-08-09T03:40:39.936Z","dateUpdated":"2026-08-15T05:57:26.281Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:23","lastModifiedDate":"2026-08-15 06:22:23","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72491","Ordinal":"1","Title":"net/9p: fix race condition on rdma->state in trans_rdma.c","CVE":"CVE-2026-72491","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72491","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/9p: fix race condition on rdma->state in trans_rdma.c\n\nThe rdma->state field is modified without holding req_lock in both\nrecv_done() and p9_cm_event_handler(), while rdma_request() accesses\nthe same field under the req_lock spinlock. This inconsistent locking\ncreates a race condition:\n\n- recv_done() running in softirq completion context sets\n  rdma->state = P9_RDMA_FLUSHING without acquiring req_lock\n\n- p9_cm_event_handler() modifies rdma->state at multiple points\n  (ADDR_RESOLVED, ROUTE_RESOLVED, ESTABLISHED, CLOSED) without\n  req_lock\n\n- rdma_request() uses spin_lock_irqsave(&rdma->req_lock, flags) to\n  protect the read-modify-write of rdma->state\n\nThe race can cause lost state transitions: recv_done() or the CM\nevent handler could set state to FLUSHING/CLOSED while rdma_request()\nis concurrently checking or modifying state under the lock, leading to\nthe FLUSHING transition being silently overwritten by CLOSING. This\ncorrupts the connection state machine and can cause use-after-free on\nRDMA request objects during teardown.\n\nFix by adding req_lock protection to all rdma->state modifications in\nrecv_done() and p9_cm_event_handler(), matching the pattern already\nused in rdma_request(). Use spin_lock_irqsave/spin_unlock_irqrestore\nin the CM event handler since it can race with recv_done() which runs\nin softirq context.\n\nTested with a kernel module that races two threads (simulating\nrdma_request and recv_done/CM handler) on rdma->state with proper\nlocking: 5.5M+ FLUSHING writes over 27M iterations with 0 lost\ntransitions.","Type":"Description","Title":"net/9p: fix race condition on rdma->state in trans_rdma.c"}]}}}