CVE-2026-99130

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99130", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.394Z", "datePublished": "2026-10-28T10:34:43.514Z", "dateUpdated": "2026-10-30T12:42:03.208Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:42:03.208Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/cancel: don't spin on local work the task can't run\n\nio_uring_cancel_generic() refuses to sleep while any ring on the exiting\ntask's tctx has local work pending. It assumes the task is that ring's\nsubmitter and that the next io_uring_try_cancel_requests() pass will run\nthe work. This does not hold for a ring that was still\nIORING_SETUP_R_DISABLED when the task got its tctx node from\nio_uring_create() or io_ringfd_register(). The submitter is set later by\nIORING_REGISTER_ENABLE_RINGS, possibly from another task, and only the\nsubmitter may run local work on an IORING_SETUP_DEFER_TASKRUN ring. To\nthe exiting task the work stays pending forever, the loop never reaches\nschedule(), and the task trips the WARN_ON_ONCE() once and then spins in\ndo_exit().\n\nAn unprivileged user can set this up at will by creating a disabled\nring, having a child enable it and stop, posting to the ring with\nIORING_OP_MSG_RING and exiting with a request in flight that only the\nchild can complete. The exiting thread burns a CPU until the child runs\nor dies, and with panic_on_warn set the WARN panics the kernel.\n\nFix by skipping the sleep only when io_allowed_defer_tw_run() allows the\ntask to run the work. This is reasonable since work it cannot run cannot\ncomplete any of its requests either, so nothing is lost by sleeping.\nDrop the WARN_ON_ONCE() since handing a disabled ring to another thread\nis a supported scenario, not a bug state."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["io_uring/cancel.c"], "versions": [{"version": "360cd42c4e95ff06d8d7b0a54e42236c7e7c187f", "lessThan": "64e196a6d7173667a2a0fe2f191bc64eecd07778", "status": "affected", "versionType": "git"}, {"version": "360cd42c4e95ff06d8d7b0a54e42236c7e7c187f", "lessThan": "8a241d7ca23be2695a1fbe587ee12eae061c31af", "status": "affected", "versionType": "git"}, {"version": "360cd42c4e95ff06d8d7b0a54e42236c7e7c187f", "lessThan": "94d13387b96e50a4288f7bbdfe401189246a11a1", "status": "affected", "versionType": "git"}, {"version": "360cd42c4e95ff06d8d7b0a54e42236c7e7c187f", "lessThan": "3005459e0ddfcef0f555b6e81f672f2c49a1c0aa", "status": "affected", "versionType": "git"}, {"version": "360cd42c4e95ff06d8d7b0a54e42236c7e7c187f", "lessThan": "fddcf4c5321b3ea5f72166c3fd36a9d1c34f80c7", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["io_uring/cancel.c"], "versions": [{"version": "6.4", "status": "affected"}, {"version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.161", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.115", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.59", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.13", "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": "6.4", "versionEndExcluding": "6.6.161"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.12.115"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.18.59"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "7.2.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/64e196a6d7173667a2a0fe2f191bc64eecd07778"}, {"url": "https://git.kernel.org/stable/c/8a241d7ca23be2695a1fbe587ee12eae061c31af"}, {"url": "https://git.kernel.org/stable/c/94d13387b96e50a4288f7bbdfe401189246a11a1"}, {"url": "https://git.kernel.org/stable/c/3005459e0ddfcef0f555b6e81f672f2c49a1c0aa"}, {"url": "https://git.kernel.org/stable/c/fddcf4c5321b3ea5f72166c3fd36a9d1c34f80c7"}], "title": "io_uring/cancel: don't spin on local work the task can't run", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["io_uring/cancel.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "64e196a6d7173667a2a0fe2f191bc64eecd07778", "status": "affected", "version": "360cd42c4e95ff06d8d7b0a54e42236c7e7c187f", "versionType": "git"}, {"lessThan": "8a241d7ca23be2695a1fbe587ee12eae061c31af", "status": "affected", "version": "360cd42c4e95ff06d8d7b0a54e42236c7e7c187f", "versionType": "git"}, {"lessThan": "94d13387b96e50a4288f7bbdfe401189246a11a1", "status": "affected", "version": "360cd42c4e95ff06d8d7b0a54e42236c7e7c187f", "versionType": "git"}, {"lessThan": "3005459e0ddfcef0f555b6e81f672f2c49a1c0aa", "status": "affected", "version": "360cd42c4e95ff06d8d7b0a54e42236c7e7c187f", "versionType": "git"}, {"lessThan": "fddcf4c5321b3ea5f72166c3fd36a9d1c34f80c7", "status": "affected", "version": "360cd42c4e95ff06d8d7b0a54e42236c7e7c187f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["io_uring/cancel.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.4"}, {"lessThan": "6.4", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.161", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.115", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.59", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.13", "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/cancel: don't spin on local work the task can't run\n\nio_uring_cancel_generic() refuses to sleep while any ring on the exiting\ntask's tctx has local work pending. It assumes the task is that ring's\nsubmitter and that the next io_uring_try_cancel_requests() pass will run\nthe work. This does not hold for a ring that was still\nIORING_SETUP_R_DISABLED when the task got its tctx node from\nio_uring_create() or io_ringfd_register(). The submitter is set later by\nIORING_REGISTER_ENABLE_RINGS, possibly from another task, and only the\nsubmitter may run local work on an IORING_SETUP_DEFER_TASKRUN ring. To\nthe exiting task the work stays pending forever, the loop never reaches\nschedule(), and the task trips the WARN_ON_ONCE() once and then spins in\ndo_exit().\n\nAn unprivileged user can set this up at will by creating a disabled\nring, having a child enable it and stop, posting to the ring with\nIORING_OP_MSG_RING and exiting with a request in flight that only the\nchild can complete. The exiting thread burns a CPU until the child runs\nor dies, and with panic_on_warn set the WARN panics the kernel.\n\nFix by skipping the sleep only when io_allowed_defer_tw_run() allows the\ntask to run the work. This is reasonable since work it cannot run cannot\ncomplete any of its requests either, so nothing is lost by sleeping.\nDrop the WARN_ON_ONCE() since handing a disabled ring to another thread\nis a supported scenario, not a bug state."}], "id": "CVE-2026-99130", "lastModified": "2026-10-30T13:21:47.173", "metrics": {}, "published": "2026-10-28T11:17:32.800", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3005459e0ddfcef0f555b6e81f672f2c49a1c0aa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/64e196a6d7173667a2a0fe2f191bc64eecd07778"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8a241d7ca23be2695a1fbe587ee12eae061c31af"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/94d13387b96e50a4288f7bbdfe401189246a11a1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fddcf4c5321b3ea5f72166c3fd36a9d1c34f80c7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: kernel: Denial of service via infinite loop during io_uring cancellation", "id": "2562768", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2562768"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-835", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nio_uring/cancel: don't spin on local work the task can't run\nio_uring_cancel_generic() refuses to sleep while any ring on the exiting\ntask's tctx has local work pending. It assumes the task is that ring's\nsubmitter and that the next io_uring_try_cancel_requests() pass will run\nthe work. This does not hold for a ring that was still\nIORING_SETUP_R_DISABLED when the task got its tctx node from\nio_uring_create() or io_ringfd_register(). The submitter is set later by\nIORING_REGISTER_ENABLE_RINGS, possibly from another task, and only the\nsubmitter may run local work on an IORING_SETUP_DEFER_TASKRUN ring. To\nthe exiting task the work stays pending forever, the loop never reaches\nschedule(), and the task trips the WARN_ON_ONCE() once and then spins in\ndo_exit().\nAn unprivileged user can set this up at will by creating a disabled\nring, having a child enable it and stop, posting to the ring with\nIORING_OP_MSG_RING and exiting with a request in flight that only the\nchild can complete. The exiting thread burns a CPU until the child runs\nor dies, and with panic_on_warn set the WARN panics the kernel.\nFix by skipping the sleep only when io_allowed_defer_tw_run() allows the\ntask to run the work. This is reasonable since work it cannot run cannot\ncomplete any of its requests either, so nothing is lost by sleeping.\nDrop the WARN_ON_ONCE() since handing a disabled ring to another thread\nis a supported scenario, not a bug state.", "A flaw was found in the Linux kernel's io_uring subsystem. A local attacker can exploit this vulnerability to cause a Denial of Service (DoS) by triggering an infinite loop during process exit. This issue occurs when an exiting task attempts to cancel requests on an io_uring ring with pending work that only another thread is permitted to execute, preventing the task from completing its exit sequence. Consequently, the thread continuously consumes processor resources, which may lead to system unresponsiveness or a kernel crash."], "name": "CVE-2026-99130", "public_date": "2026-10-28T10:34:43Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-99130\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-99130\nhttps://git.kernel.org/stable/c/3005459e0ddfcef0f555b6e81f672f2c49a1c0aa\nhttps://git.kernel.org/stable/c/94d13387b96e50a4288f7bbdfe401189246a11a1\nhttps://git.kernel.org/stable/c/fddcf4c5321b3ea5f72166c3fd36a9d1c34f80c7"], "threat_severity": "Moderate"}

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