CVE-2026-98130

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98130", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.318Z", "datePublished": "2026-09-25T10:36:10.243Z", "dateUpdated": "2026-10-19T09:14:23.404Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:14:23.404Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix a TOCTOU race in SCTP_CMD_TIMER_START\n\nThe SCTP_CMD_TIMER_START handler checks timer_pending() before calling\ntimer_reduce(). The timer can expire and detach between these operations,\ncausing timer_reduce() to rearm the timer without taking the association\nreference required for the newly armed timer.\n\nThe timer callback later unconditionally drops its association reference,\nwhich can leave the association reference count unbalanced and result in\nuse-after-free during association teardown.\n\nUse the return value of timer_reduce() to determine whether the timer was\nactually armed. Take the association reference only when timer_reduce()\nsuccessfully starts a new timer, closing the race between checking the\ntimer state and rearming it.\n\nThis issue was reported by Nico Yip (@_cyeaa_) working with TrendAI Zero\nDay Initiative."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - A remote SCTP peer's restart COOKIE-ECHO goes through sctp_sf_do_5_2_4_dupcook()/sctp_sf_do_dupcook_a() in SHUTDOWN_SENT and on to sctp_sf_do_9_2_start_shutdown(). That queues SCTP_CMD_TIMER_START for T2-shutdown while T2 is already armed, which reaches the racy timer_pending()/timer_reduce() pair in sctp_cmd_interpreter(). SCTP runs over routable IP.\nAC:H - The peer must time its COOKIE-ECHO so that T2 expires on another CPU in the window between timer_pending() and timer_reduce(), which is two adjacent statements. The attacker can retry by timing packets around T2 retransmissions, but cannot control when the kernel timer fires relative to softirq processing. The target association must also be in SHUTDOWN_SENT with its socket closing.\nPR:N - SCTP association setup and the restart COOKIE-ECHO path in sctp_sf_do_dupcook_a() need no authentication. The attacker is just the unauthenticated peer of the association.\nUI:N - No victim action is needed beyond the SCTP service normally closing an association, which puts it in SHUTDOWN_SENT. The attacker sends all the triggering packets.\nS:U - The corruption is confined to the kernel's own sctp_association object. No security boundary such as a VM or IOMMU is crossed.\nC:H - Re-arming the timer without sctp_association_hold() lets sctp_generate_timeout_event() call sctp_association_put() one time too many. The association is then freed while still referenced, a use-after-free of a large slab object whose reclaimed contents can be used to leak kernel memory.\nI:H - The freed sctp_association holds function-relevant state such as timers, transports and the outqueue. Later timer callbacks and teardown writes into reclaimed memory give a write primitive that could be used to hijack control flow.\nA:H - The unbalanced refcount causes a refcount underflow or use-after-free during association teardown or a later timer callback, crashing the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sctp/sm_sideeffect.c"], "versions": [{"version": "20a785aa52c82246055a089e55df9dac47d67da1", "lessThan": "cbf2df9aac4202f9fb0b361a7fe8c79b29fad92c", "status": "affected", "versionType": "git"}, {"version": "20a785aa52c82246055a089e55df9dac47d67da1", "lessThan": "3205a20f837f5b1f009427ac3d9f706bf8a6fbec", "status": "affected", "versionType": "git"}, {"version": "20a785aa52c82246055a089e55df9dac47d67da1", "lessThan": "755d70ca845fd9b87c7b338ae6ae832b08cd0005", "status": "affected", "versionType": "git"}, {"version": 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"085bb270b4b1168c93afb37bbafc881207d15443", "status": "affected", "versionType": "git"}, {"version": "4.19.126", "lessThan": "4.20", "status": "affected", "versionType": "semver"}, {"version": "5.4.44", "lessThan": "5.5", "status": "affected", "versionType": "semver"}, {"version": "5.6.16", "lessThan": "5.7", "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/sctp/sm_sideeffect.c"], "versions": [{"version": "5.7", "status": "affected"}, {"version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.271", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.7", "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": "5.7", "versionEndExcluding": "5.10.271"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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{}

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"status": "affected", "version": "5.6.16", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sctp/sm_sideeffect.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.7"}, {"lessThan": "5.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.271", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.222", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9232A5F8-171A-4235-B136-95DC2459D811", "versionEndExcluding": "4.20", "versionStartIncluding": "4.19.126", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "8DA34D52-0D71-4B18-9AD6-84CF42AF02BB", "versionEndExcluding": "5.5", "versionStartIncluding": "5.4.44", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9018F5D8-6A28-43D2-B2D3-D6015DAA2F4F", "versionEndExcluding": "5.7", "versionStartIncluding": "5.6.16", "vulnerable": true}, {"criteria": 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following vulnerability has been resolved:\n\nsctp: fix a TOCTOU race in SCTP_CMD_TIMER_START\n\nThe SCTP_CMD_TIMER_START handler checks timer_pending() before calling\ntimer_reduce(). The timer can expire and detach between these operations,\ncausing timer_reduce() to rearm the timer without taking the association\nreference required for the newly armed timer.\n\nThe timer callback later unconditionally drops its association reference,\nwhich can leave the association reference count unbalanced and result in\nuse-after-free during association teardown.\n\nUse the return value of timer_reduce() to determine whether the timer was\nactually armed. Take the association reference only when timer_reduce()\nsuccessfully starts a new timer, closing the race between checking the\ntimer state and rearming it.\n\nThis issue was reported by Nico Yip (@_cyeaa_) working with TrendAI Zero\nDay Initiative."}], "id": "CVE-2026-98130", "lastModified": "2026-10-22T15:26:06.140", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-25T11:17:44.380", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/00b841bac10230c557be6b38efc48508198fe23e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/09e7f9290d63178f56095d5c18fb9f9470153db5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2188569e7e1b0bc3f3b557dc97ab7a02befc11c8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3205a20f837f5b1f009427ac3d9f706bf8a6fbec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3d698d1e6c8bc41e3e1707777a016f1bdd07842d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/755d70ca845fd9b87c7b338ae6ae832b08cd0005"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cbf2df9aac4202f9fb0b361a7fe8c79b29fad92c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e42ba56281ca3ae2dcb3558bebee9a1c9a4831d9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START", "id": "2541331", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541331"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsctp: fix a TOCTOU race in SCTP_CMD_TIMER_START\nThe SCTP_CMD_TIMER_START handler checks timer_pending() before calling\ntimer_reduce(). The timer can expire and detach between these operations,\ncausing timer_reduce() to rearm the timer without taking the association\nreference required for the newly armed timer.\nThe timer callback later unconditionally drops its association reference,\nwhich can leave the association reference count unbalanced and result in\nuse-after-free during association teardown.\nUse the return value of timer_reduce() to determine whether the timer was\nactually armed. Take the association reference only when timer_reduce()\nsuccessfully starts a new timer, closing the race between checking the\ntimer state and rearming it.\nThis issue was reported by Nico Yip (@_cyeaa_) working with TrendAI Zero\nDay Initiative.", "A flaw was found in the Linux kernel's Stream Control Transmission Protocol (SCTP) subsystem. A race condition exists when starting an SCTP timer, where the timer can expire before it is reset, resulting in improper reference counting for the connection association. An attacker could exploit this timing flaw during connection teardown to trigger a use-after-free condition, potentially causing a Denial of Service (DoS) or system crash."], "name": "CVE-2026-98130", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98130\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98130\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98130.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[20a785aa52c82246055a089e55df9dac47d67da1,e42ba56281ca3ae2dcb3558bebee9a1c9a4831d9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[20a785aa52c82246055a089e55df9dac47d67da1,00b841bac10230c557be6b38efc48508198fe23e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[20a785aa52c82246055a089e55df9dac47d67da1,3d698d1e6c8bc41e3e1707777a016f1bdd07842d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[20a785aa52c82246055a089e55df9dac47d67da1,2188569e7e1b0bc3f3b557dc97ab7a02befc11c8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "9c0a4652f750afe3b4468cbcd9335b244ce2facd"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "70989e501fbce502198d82da88358ce453575a05"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "085bb270b4b1168c93afb37bbafc881207d15443"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.19.126,4.20)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.4.44,5.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.6.16,5.7)"}}], "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": "semver", "value": "5.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.7,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc2,*]"}}], "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": "2026-09-25T11:45:19.827658+00:00", "updated": "2026-10-22T23:45:13.047002+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}