CVE-2026-72491 - Vulnerability Details

Vendors	Products
Linux	Linux Kernel

Link	Providers
https://git.kernel.org/stable/c/13bf9879b778b2f4b260b45bed18f31806120d1e
https://git.kernel.org/stable/c/151f8cf5b23d8a534d884432a82a6d54d5a61989
https://git.kernel.org/stable/c/3970a19a80de530b801b6256354d4a529a9a2d6c
https://git.kernel.org/stable/c/4cee2b8766045059d5e0b8114837b4a8efe827ac
https://git.kernel.org/stable/c/5424138848eb7d7d8a7196676e90a2cbf2142454
https://git.kernel.org/stable/c/7d54894a1ee265a72d70f7cae1da6cc774cccc71
https://git.kernel.org/stable/c/8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b
https://git.kernel.org/stable/c/ebbcbe5c0db215feecc17def06178da443f4eea6

Type	Values Removed	Values Added
Description		In 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.
Title		net/9p: fix race condition on rdma->state in trans_rdma.c
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/13bf9879b778b2f4b260b45bed18f31806120d1e https://git.kernel.org/stable/c/151f8cf5b23d8a534d884432a82a6d54d5a61989 https://git.kernel.org/stable/c/3970a19a80de530b801b6256354d4a529a9a2d6c https://git.kernel.org/stable/c/4cee2b8766045059d5e0b8114837b4a8efe827ac https://git.kernel.org/stable/c/5424138848eb7d7d8a7196676e90a2cbf2142454 https://git.kernel.org/stable/c/7d54894a1ee265a72d70f7cae1da6cc774cccc71 https://git.kernel.org/stable/c/8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b https://git.kernel.org/stable/c/ebbcbe5c0db215feecc17def06178da443f4eea6

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72491", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.936Z", "datePublished": "2026-08-15T05:57:26.281Z", "dateUpdated": "2026-08-15T05:57:26.281Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-15T05:57:26.281Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/9p/trans_rdma.c"], "versions": [{"version": "473c7dd1d7b59ff8f88a5154737e3eac78a96e5b", "lessThan": "4cee2b8766045059d5e0b8114837b4a8efe827ac", "status": "affected", "versionType": "git"}, {"version": "473c7dd1d7b59ff8f88a5154737e3eac78a96e5b", "lessThan": "5424138848eb7d7d8a7196676e90a2cbf2142454", "status": "affected", "versionType": "git"}, {"version": "473c7dd1d7b59ff8f88a5154737e3eac78a96e5b", "lessThan": "3970a19a80de530b801b6256354d4a529a9a2d6c", "status": "affected", "versionType": "git"}, {"version": "473c7dd1d7b59ff8f88a5154737e3eac78a96e5b", "lessThan": "8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b", "status": "affected", "versionType": "git"}, {"version": "473c7dd1d7b59ff8f88a5154737e3eac78a96e5b", "lessThan": "151f8cf5b23d8a534d884432a82a6d54d5a61989", "status": "affected", "versionType": "git"}, {"version": "473c7dd1d7b59ff8f88a5154737e3eac78a96e5b", "lessThan": "13bf9879b778b2f4b260b45bed18f31806120d1e", "status": "affected", "versionType": "git"}, {"version": "473c7dd1d7b59ff8f88a5154737e3eac78a96e5b", "lessThan": "ebbcbe5c0db215feecc17def06178da443f4eea6", "status": "affected", "versionType": "git"}, {"version": "473c7dd1d7b59ff8f88a5154737e3eac78a96e5b", "lessThan": "7d54894a1ee265a72d70f7cae1da6cc774cccc71", "status": "affected", "versionType": "git"}, {"version": "3479b3c35e82ed10aa0ca2ee9e78c4eded06ba62", "status": "affected", "versionType": "git"}, {"version": "c01ddaa54d7411e964ffd250c018d8469c5852f2", "status": "affected", "versionType": "git"}, {"version": "9e69c673fe077b8dc491cd8406c9bdcb1f76dee2", "status": "affected", "versionType": "git"}, {"version": "e48e7e27e4dfd00c81e0381e7cee610cce021452", "status": "affected", "versionType": "git"}, {"version": "4.4.185", "lessThan": "4.5", "status": "affected", "versionType": "semver"}, {"version": "4.9.185", "lessThan": "4.10", "status": "affected", "versionType": "semver"}, {"version": "4.14.132", "lessThan": "4.15", "status": "affected", "versionType": "semver"}, {"version": "4.19.57", "lessThan": "4.20", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/9p/trans_rdma.c"], "versions": [{"version": "4.20", "status": "affected"}, {"version": "0", "lessThan": "4.20", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.2-rc1"}, {"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"}]}]}], "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"}}}}

{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-72491", "lastModified": "2026-08-15T06:22:23.400", "metrics": {}, "published": "2026-08-15T06:22:23.400", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/13bf9879b778b2f4b260b45bed18f31806120d1e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/151f8cf5b23d8a534d884432a82a6d54d5a61989"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3970a19a80de530b801b6256354d4a529a9a2d6c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4cee2b8766045059d5e0b8114837b4a8efe827ac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5424138848eb7d7d8a7196676e90a2cbf2142454"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7d54894a1ee265a72d70f7cae1da6cc774cccc71"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ebbcbe5c0db215feecc17def06178da443f4eea6"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

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