CVE-2026-98950

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98950", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.382Z", "datePublished": "2026-10-23T12:19:09.890Z", "dateUpdated": "2026-10-30T12:40:29.247Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:40:29.247Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nflow_dissector: avoid u16 truncation of hlen in bpf_flow_dissect()\n\nbpf_flow_dissect() sanitizes the offsets returned by the BPF program\nwith clamp_t(u16, ..., hlen).\n\nIf hlen is bigger than 65535, the upper bound is truncated before\nthe comparison. For instance, with hlen == 65536, both nhoff and\nthoff are forced to zero, even if the program returned sane values.\n\nThis is the same class of bug as the one fixed in commit 99bda1ecbd56\n(\"flow_dissector: avoid u16 truncation of skb->len when computing\nthoff\"). That fix does not cover the BPF path, because\n__skb_flow_dissect() returns early when a BPF flow dissector\nhandles the packet.\n\nstruct bpf_flow_keys stores nhoff and thoff as u16, so cap hlen\nto U16_MAX before clamping.\n\nFound by sashiko while reviewing the commit above."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/flow_dissector.c"], "versions": [{"version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "lessThan": "46d21495f633e38d40857401504ee51c56ffed2a", "status": "affected", "versionType": "git"}, {"version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "lessThan": "6267f8304cbd9ec9f3f53bd227a733e07131492e", "status": "affected", "versionType": "git"}, {"version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "lessThan": "99c59062172620a0bac4ae8cf37c83bb78772cdd", "status": "affected", "versionType": "git"}, {"version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "lessThan": "c44c02c930c6583b235a1937c69ff716c4bb4514", "status": "affected", "versionType": "git"}, {"version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "lessThan": "3fb5ad2951a6df92c98f4f06cd70f20c50a2eb2a", "status": "affected", "versionType": "git"}, {"version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "lessThan": "cc18eb0e9941162c03f03f411ed7f6c339d91fa0", "status": "affected", "versionType": "git"}, {"version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "lessThan": "61b43a51a55929ec040bee3ea51af2121b956d05", "status": "affected", "versionType": "git"}, {"version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "lessThan": "f202578efc738b883cfa04889eb97328914265a7", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/flow_dissector.c"], "versions": [{"version": "4.20", "status": "affected"}, {"version": "0", "lessThan": "4.20", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.11", "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": "4.20", "versionEndExcluding": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.12.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.2.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/46d21495f633e38d40857401504ee51c56ffed2a"}, {"url": "https://git.kernel.org/stable/c/6267f8304cbd9ec9f3f53bd227a733e07131492e"}, {"url": "https://git.kernel.org/stable/c/99c59062172620a0bac4ae8cf37c83bb78772cdd"}, {"url": "https://git.kernel.org/stable/c/c44c02c930c6583b235a1937c69ff716c4bb4514"}, {"url": "https://git.kernel.org/stable/c/3fb5ad2951a6df92c98f4f06cd70f20c50a2eb2a"}, {"url": "https://git.kernel.org/stable/c/cc18eb0e9941162c03f03f411ed7f6c339d91fa0"}, {"url": "https://git.kernel.org/stable/c/61b43a51a55929ec040bee3ea51af2121b956d05"}, {"url": "https://git.kernel.org/stable/c/f202578efc738b883cfa04889eb97328914265a7"}], "title": "flow_dissector: avoid u16 truncation of hlen in bpf_flow_dissect()", 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/core/flow_dissector.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "46d21495f633e38d40857401504ee51c56ffed2a", "status": "affected", "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "versionType": "git"}, {"lessThan": "6267f8304cbd9ec9f3f53bd227a733e07131492e", "status": "affected", "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "versionType": "git"}, {"lessThan": "99c59062172620a0bac4ae8cf37c83bb78772cdd", "status": "affected", "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "versionType": "git"}, {"lessThan": "c44c02c930c6583b235a1937c69ff716c4bb4514", "status": "affected", "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "versionType": "git"}, {"lessThan": "3fb5ad2951a6df92c98f4f06cd70f20c50a2eb2a", "status": "affected", "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "versionType": "git"}, {"lessThan": "cc18eb0e9941162c03f03f411ed7f6c339d91fa0", "status": "affected", "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "versionType": "git"}, {"lessThan": "61b43a51a55929ec040bee3ea51af2121b956d05", "status": "affected", "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "versionType": "git"}, {"lessThan": "f202578efc738b883cfa04889eb97328914265a7", "status": "affected", "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/core/flow_dissector.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": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.113", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.11", "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\nflow_dissector: avoid u16 truncation of hlen in bpf_flow_dissect()\n\nbpf_flow_dissect() sanitizes the offsets returned by the BPF program\nwith clamp_t(u16, ..., hlen).\n\nIf hlen is bigger than 65535, the upper bound is truncated before\nthe comparison. For instance, with hlen == 65536, both nhoff and\nthoff are forced to zero, even if the program returned sane values.\n\nThis is the same class of bug as the one fixed in commit 99bda1ecbd56\n(\"flow_dissector: avoid u16 truncation of skb->len when computing\nthoff\"). That fix does not cover the BPF path, because\n__skb_flow_dissect() returns early when a BPF flow dissector\nhandles the packet.\n\nstruct bpf_flow_keys stores nhoff and thoff as u16, so cap hlen\nto U16_MAX before clamping.\n\nFound by sashiko while reviewing the commit above."}], "id": "CVE-2026-98950", "lastModified": "2026-10-30T13:21:32.563", "metrics": {}, "published": "2026-10-23T13:17:16.153", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3fb5ad2951a6df92c98f4f06cd70f20c50a2eb2a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/46d21495f633e38d40857401504ee51c56ffed2a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/61b43a51a55929ec040bee3ea51af2121b956d05"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6267f8304cbd9ec9f3f53bd227a733e07131492e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/99c59062172620a0bac4ae8cf37c83bb78772cdd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c44c02c930c6583b235a1937c69ff716c4bb4514"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cc18eb0e9941162c03f03f411ed7f6c339d91fa0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f202578efc738b883cfa04889eb97328914265a7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: flow_dissector: avoid u16 truncation of hlen in bpf_flow_dissect()", "id": "2559623", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2559623"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-681", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nflow_dissector: avoid u16 truncation of hlen in bpf_flow_dissect()\nbpf_flow_dissect() sanitizes the offsets returned by the BPF program\nwith clamp_t(u16, ..., hlen).\nIf hlen is bigger than 65535, the upper bound is truncated before\nthe comparison. For instance, with hlen == 65536, both nhoff and\nthoff are forced to zero, even if the program returned sane values.\nThis is the same class of bug as the one fixed in commit 99bda1ecbd56\n(\"flow_dissector: avoid u16 truncation of skb->len when computing\nthoff\"). That fix does not cover the BPF path, because\n__skb_flow_dissect() returns early when a BPF flow dissector\nhandles the packet.\nstruct bpf_flow_keys stores nhoff and thoff as u16, so cap hlen\nto U16_MAX before clamping.\nFound by sashiko while reviewing the commit above.", "A flaw was found in the Linux kernel. A remote attacker could trigger a Denial of Service (DoS) or improper packet routing due to an integer truncation vulnerability within the Berkeley Packet Filter (BPF) flow dissector. When handling packets with header lengths exceeding 16-bit limits (65,535 bytes), the upper bound value is truncated during offset clamping, forcing network and transport header offsets to zero. This miscalculation can disrupt packet classification and cause network traffic to be misrouted or dropped."], "name": "CVE-2026-98950", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-23T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98950\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98950\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98950.mbox"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9,c44c02c930c6583b235a1937c69ff716c4bb4514)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9,3fb5ad2951a6df92c98f4f06cd70f20c50a2eb2a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9,cc18eb0e9941162c03f03f411ed7f6c339d91fa0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9,61b43a51a55929ec040bee3ea51af2121b956d05)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9,f202578efc738b883cfa04889eb97328914265a7)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.20"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.20)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.160,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.113,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.57,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.11,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9,c44c02c930c6583b235a1937c69ff716c4bb4514)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9,3fb5ad2951a6df92c98f4f06cd70f20c50a2eb2a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9,cc18eb0e9941162c03f03f411ed7f6c339d91fa0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9,61b43a51a55929ec040bee3ea51af2121b956d05)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9,f202578efc738b883cfa04889eb97328914265a7)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"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": "4.20"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.20)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.160,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.113,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.57,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.11,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-23T15:15:14.434441+00:00", "updated": "2026-10-29T23:00:06.202261+00:00", "vendors": ["linux", "linux$PRODUCT$linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-681"]}