CVE-2026-80920

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80920", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.801Z", "datePublished": "2026-09-09T16:13:17.023Z", "dateUpdated": "2026-10-21T12:47:14.401Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:47:14.401Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: defer eventfd signaling when queued from a wakeup handler\n\nio_req_local_work_add() signals the CQ ring eventfd inline when it is the\none to push the first entry onto ->work_list. For DEFER_TASKRUN rings that\nadd is frequently done from a waitqueue wakeup handler, where an\narbitrary waitqueue lock is held.\n\neventfd_signal_mask() only refuses to recurse when current->in_eventfd\nis set, but that bit is set by eventfd_signal_mask() itself. If the wake\nchain starts somewhere else, signal goes out inline and can feed back\ninto epoll.\n\nAdd IOU_F_TWQ_IN_WAKE, set it on the task_work add done from the three\nwaitqueue callbacks, and use it to force io_eventfd_signal() down the\nexisting call_rcu_hurry() deferral instead of signaling inline."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/io_uring_types.h", "io_uring/eventfd.c", "io_uring/eventfd.h", "io_uring/futex.c", "io_uring/io_uring.c", "io_uring/poll.c", "io_uring/tw.c", "io_uring/waitid.c"], "versions": [{"version": "21a091b970cdbcf3e8ff829234b51be6f9192766", "lessThan": "d0c240f25e654442a72af5ca021a02165ccce638", "status": "affected", "versionType": "git"}, {"version": "21a091b970cdbcf3e8ff829234b51be6f9192766", "lessThan": "9d984451baf768ecd9e1fdad4637b729fcb2c9d5", "status": "affected", "versionType": "git"}, {"version": "21a091b970cdbcf3e8ff829234b51be6f9192766", "lessThan": "e22f4494cc9487d326e5e3067f33dea7c1e442b2", "status": "affected", "versionType": "git"}, {"version": "21a091b970cdbcf3e8ff829234b51be6f9192766", "lessThan": "b6bb334b0e9348887e3e55e1f494b0c3b8fbf59f", "status": "affected", "versionType": "git"}, {"version": "21a091b970cdbcf3e8ff829234b51be6f9192766", "lessThan": "40b6ccf68731809ceb85c6e9f0f8f2ed61c7aa5a", "status": "affected", "versionType": "git"}, {"version": "21a091b970cdbcf3e8ff829234b51be6f9192766", "lessThan": "cd305ee3633a45fcf5f3a5d83f99f3cb77d87b6e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/io_uring_types.h", "io_uring/eventfd.c", "io_uring/eventfd.h", "io_uring/futex.c", "io_uring/io_uring.c", "io_uring/poll.c", "io_uring/tw.c", "io_uring/waitid.c"], "versions": [{"version": "6.1", "status": "affected"}, {"version": "0", "lessThan": "6.1", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.49", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.11", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.1", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "6.1", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.18.49"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "7.1.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "7.2.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d0c240f25e654442a72af5ca021a02165ccce638"}, {"url": "https://git.kernel.org/stable/c/9d984451baf768ecd9e1fdad4637b729fcb2c9d5"}, {"url": "https://git.kernel.org/stable/c/e22f4494cc9487d326e5e3067f33dea7c1e442b2"}, {"url": "https://git.kernel.org/stable/c/b6bb334b0e9348887e3e55e1f494b0c3b8fbf59f"}, {"url": "https://git.kernel.org/stable/c/40b6ccf68731809ceb85c6e9f0f8f2ed61c7aa5a"}, {"url": "https://git.kernel.org/stable/c/cd305ee3633a45fcf5f3a5d83f99f3cb77d87b6e"}], "title": "io_uring: defer eventfd signaling when queued from a wakeup handler", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/linux/io_uring_types.h", "io_uring/eventfd.c", "io_uring/eventfd.h", "io_uring/futex.c", "io_uring/io_uring.c", "io_uring/poll.c", "io_uring/tw.c", "io_uring/waitid.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "d0c240f25e654442a72af5ca021a02165ccce638", "status": "affected", "version": "21a091b970cdbcf3e8ff829234b51be6f9192766", "versionType": "git"}, {"lessThan": "9d984451baf768ecd9e1fdad4637b729fcb2c9d5", "status": "affected", "version": "21a091b970cdbcf3e8ff829234b51be6f9192766", "versionType": "git"}, {"lessThan": "e22f4494cc9487d326e5e3067f33dea7c1e442b2", "status": "affected", "version": "21a091b970cdbcf3e8ff829234b51be6f9192766", "versionType": "git"}, {"lessThan": "b6bb334b0e9348887e3e55e1f494b0c3b8fbf59f", "status": "affected", "version": "21a091b970cdbcf3e8ff829234b51be6f9192766", "versionType": "git"}, {"lessThan": "40b6ccf68731809ceb85c6e9f0f8f2ed61c7aa5a", "status": "affected", "version": "21a091b970cdbcf3e8ff829234b51be6f9192766", "versionType": "git"}, {"lessThan": "cd305ee3633a45fcf5f3a5d83f99f3cb77d87b6e", "status": "affected", "version": "21a091b970cdbcf3e8ff829234b51be6f9192766", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/linux/io_uring_types.h", "io_uring/eventfd.c", "io_uring/eventfd.h", "io_uring/futex.c", "io_uring/io_uring.c", "io_uring/poll.c", "io_uring/tw.c", "io_uring/waitid.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.1"}, {"lessThan": "6.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.49", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.11", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.1", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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\nio_uring: defer eventfd signaling when queued from a wakeup handler\n\nio_req_local_work_add() signals the CQ ring eventfd inline when it is the\none to push the first entry onto ->work_list. For DEFER_TASKRUN rings that\nadd is frequently done from a waitqueue wakeup handler, where an\narbitrary waitqueue lock is held.\n\neventfd_signal_mask() only refuses to recurse when current->in_eventfd\nis set, but that bit is set by eventfd_signal_mask() itself. If the wake\nchain starts somewhere else, signal goes out inline and can feed back\ninto epoll.\n\nAdd IOU_F_TWQ_IN_WAKE, set it on the task_work add done from the three\nwaitqueue callbacks, and use it to force io_eventfd_signal() down the\nexisting call_rcu_hurry() deferral instead of signaling inline."}], "id": "CVE-2026-80920", "lastModified": "2026-10-21T13:20:01.277", "metrics": {}, "published": "2026-09-09T17:17:47.120", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/40b6ccf68731809ceb85c6e9f0f8f2ed61c7aa5a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9d984451baf768ecd9e1fdad4637b729fcb2c9d5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b6bb334b0e9348887e3e55e1f494b0c3b8fbf59f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cd305ee3633a45fcf5f3a5d83f99f3cb77d87b6e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d0c240f25e654442a72af5ca021a02165ccce638"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e22f4494cc9487d326e5e3067f33dea7c1e442b2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[21a091b970cdbcf3e8ff829234b51be6f9192766,e22f4494cc9487d326e5e3067f33dea7c1e442b2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[21a091b970cdbcf3e8ff829234b51be6f9192766,b6bb334b0e9348887e3e55e1f494b0c3b8fbf59f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[21a091b970cdbcf3e8ff829234b51be6f9192766,40b6ccf68731809ceb85c7e9f0f8f2ed61c7aa5a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[21a091b970cdbcf3e8ff829234b51be6f9192766,cd305ee3633a45fcf5f3a5d83f99f3cb77d87b6e)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.49,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.11,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.1,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-09T18:30:13.707840+00:00", "updated": "2026-09-10T19:45:08.812288+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-362"]}