CVE-2026-43101

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43101", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.984Z", "datePublished": "2026-05-06T07:40:30.969Z", "dateUpdated": "2026-10-30T12:24:56.256Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:24:56.256Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: ioam: fix potential NULL dereferences in __ioam6_fill_trace_data()\n\nWe need to check __in6_dev_get() for possible NULL value, as\nsuggested by Yiming Qian.\n\nAlso add skb_dst_dev_rcu() instead of skb_dst_dev(),\nand two missing READ_ONCE().\n\nNote that @dev can't be NULL."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable helper is reachable while processing IPv6 IOAM Hop-by-Hop options and IOAM LWT output for packets crossing an IOAM-enabled IPv6 node, so an attacker can trigger it with network traffic in a configured IOAM deployment.\nAC:L - Once IOAM is enabled/configured on the target path, triggering only requires a valid pre-allocated trace with ingress/egress interface ID fields and a route/device state where `__in6_dev_get()` returns NULL; there is no race or difficult timing requirement.\nPR:N - The attacker does not need credentials on the target to send the triggering IPv6 traffic; the administrative IOAM setup is a target deployment condition rather than an attacker privilege.\nUI:N - No victim user action is required after the vulnerable node is configured; packet processing alone reaches the dereference.\nS:U - The impact is within the same kernel/networking security authority and does not cross a VM, IOMMU, or similar boundary.\nC:N - The bug is a NULL pointer dereference of missing IPv6 device state, not an out-of-bounds read or information disclosure primitive.\nI:N - The fixed issue does not provide attacker-controlled writes or data modification; it only prevents dereferencing NULL `inet6_dev` pointers.\nA:H - A NULL pointer dereference in kernel packet processing can oops or panic the system, causing high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/ioam6.c"], "versions": [{"version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "dd0d2827b3643ff307c766865f8e31eab5cbd1f5", "status": "affected", "versionType": "git"}, {"version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "34b8390ac0ba57004b90ea568ac06f50bf896a80", "status": "affected", "versionType": "git"}, {"version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "f87aa5d1a7f56727a768757613a303b4245444a1", "status": "affected", "versionType": "git"}, {"version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "4198aab6f000b4febb18ea820fea20634dd789c7", "status": "affected", "versionType": "git"}, {"version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "3719c234fa94c37c955b1ecd3742ef280ec135e6", "status": "affected", "versionType": "git"}, {"version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "lessThan": "4e65a8b8daa18d63255ec58964dd192c7fdd9f8b", "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/ipv6/ioam6.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "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": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.24", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.14", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "5.15", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.24"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.19.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/dd0d2827b3643ff307c766865f8e31eab5cbd1f5"}, {"url": "https://git.kernel.org/stable/c/34b8390ac0ba57004b90ea568ac06f50bf896a80"}, {"url": "https://git.kernel.org/stable/c/f87aa5d1a7f56727a768757613a303b4245444a1"}, {"url": "https://git.kernel.org/stable/c/4198aab6f000b4febb18ea820fea20634dd789c7"}, {"url": "https://git.kernel.org/stable/c/3719c234fa94c37c955b1ecd3742ef280ec135e6"}, {"url": "https://git.kernel.org/stable/c/4e65a8b8daa18d63255ec58964dd192c7fdd9f8b"}], "title": "ipv6: ioam: fix potential NULL dereferences in __ioam6_fill_trace_data()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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"versionType": "git"}, {"lessThan": "4e65a8b8daa18d63255ec58964dd192c7fdd9f8b", "status": "affected", "version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv6/ioam6.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"lessThan": "5.15", "status": "unaffected", "version": "0", "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": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.24", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.14", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "802EA115-7C28-4222-914F-60C63F721E7D", "versionEndExcluding": "6.18.24", "versionStartIncluding": "5.15", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D6A8A074-BBF4-4803-ABED-519A839435BB", "versionEndExcluding": "6.19.14", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: ioam: fix potential NULL dereferences in __ioam6_fill_trace_data()\n\nWe need to check __in6_dev_get() for possible NULL value, as\nsuggested by Yiming Qian.\n\nAlso add skb_dst_dev_rcu() instead of skb_dst_dev(),\nand two missing READ_ONCE().\n\nNote that @dev can't be NULL."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nipv6: ioam: solucionar posibles desreferencias NULL en __ioam6_fill_trace_data()\n\nNecesitamos verificar __in6_dev_get() para un posible valor NULL, como sugiri\u00f3 Yiming Qian.\n\nTambi\u00e9n a\u00f1adir skb_dst_dev_rcu() en lugar de skb_dst_dev(), y dos READ_ONCE() faltantes.\n\nTenga en cuenta que @dev no puede ser NULL."}], "id": "CVE-2026-43101", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-06T10:16:23.637", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/34b8390ac0ba57004b90ea568ac06f50bf896a80"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3719c234fa94c37c955b1ecd3742ef280ec135e6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4198aab6f000b4febb18ea820fea20634dd789c7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4e65a8b8daa18d63255ec58964dd192c7fdd9f8b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dd0d2827b3643ff307c766865f8e31eab5cbd1f5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f87aa5d1a7f56727a768757613a303b4245444a1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ipv6: ioam: fix potential NULL dereferences in __ioam6_fill_trace_data()", "id": "2466996", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2466996"}, "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-476", "details": ["A flaw was found in the Linux kernel's IPv6 In-situ Operations, Administration, and Maintenance (IOAM) subsystem. The `__ioam6_fill_trace_data()` function did not properly check for NULL values, which could lead to NULL dereferences. A local or remote attacker could potentially trigger this flaw, resulting in a system crash and a denial of service."], "name": "CVE-2026-43101", "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": "Not affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43101\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43101\nhttps://lore.kernel.org/linux-cve-announce/2026050621-CVE-2026-43101-7e6e@gregkh/T"], "threat_severity": "Moderate"}

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