CVE-2026-99064

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-99064", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.389Z", "datePublished": "2026-10-23T12:23:05.854Z", "dateUpdated": "2026-10-24T14:10:17.979Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-24T14:10:17.979Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncipso: adjust cached option offsets when removing CIPSO\n\ncipso_v4_skbuff_delattr() removes the CIPSO bytes but does not adjust\ncached offsets for options that follow them.\n\nFor example, with a valid 10-byte CIPSO option followed by a seven-byte\nRR option, parsing records rr at offset 30. Removing CIPSO moves RR to\noffset 20, while the cached offset remains 30. Consumers such as\nip_forward_options() and __ip_options_echo() then access the wrong bytes;\nthe latter may interpret packet data as the option length and copy it into\nfixed-size option storage.\n\nMirror cipso_v4_delopt() and subtract cipso_len from the srr, rr, ts and\nrouter_alert offsets when they follow CIPSO. cipso_len is the distance\nthe first memmove() shifts those options. The later header move and\nnetwork-header reset relocate the bytes and their offset base together."}], "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 peer can send an IPv4 datagram containing valid CIPSO followed by RR/TS; ip_rcv()->ip_rcv_options() caches their wire offsets, then selinux_ip_forward()->netlbl_skbuff_setattr()->cipso_v4_skbuff_delattr() removes CIPSO without rebasing them.\nAC:H - The strongest path requires a CONFIG_NETLABEL/SELinux forwarding gateway with network_peer_controls, a recognized CIPSO DOI, an UNLABELED egress mapping, and a later FORWARD REJECT invoking nf_send_unreach(); these non-default conditions are outside the sender's control.\nPR:N - __ip_options_compile() applies CAP_NET_RAW only when skb is NULL; received packets undergo cipso_v4_validate() and SELinux label-policy checks, but require no peer authentication, victim credentials, or target-side privileges.\nUI:N - After the datagram arrives, ip_rcv(), SELinux FORWARD relabeling, and nf_send_unreach()->__ip_options_echo() execute entirely in kernel packet handling without any victim action.\nS:U - The overwrite occurs in __ip_options_echo()'s in-kernel reply-option storage and can compromise the same host kernel; it crosses no VM, IOMMU, or separate security-authority boundary.\nC:H - With stale opt->rr pointing into payload, __ip_options_echo() takes an attacker-chosen length and source bytes and copies up to 255 bytes into 40-byte replyopts.opt.__data; control-flow compromise from this stack overwrite can expose arbitrary kernel memory.\nI:H - The memcpy() can place 255 attacker-controlled payload bytes into the 40-byte stack destination, crossing the stack canary and saved return address in the demonstrated x86-64 layout and enabling kernel control-flow hijacking.\nA:H - The 255-byte __ip_options_echo() stack overwrite triggers KASAN or the stack canary and can panic the kernel; the packet-processing path can be invoked repeatedly with crafted IPv4 datagrams."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/cipso_ipv4.c"], "versions": [{"version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285", "lessThan": "b965977126a90e01825814c859ba4788691eddd3", "status": "affected", "versionType": "git"}, {"version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285", "lessThan": "2200fe1d6148b78e1b8f00f4b2bd47760015077f", "status": "affected", "versionType": "git"}, {"version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285", "lessThan": "6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0", "status": "affected", "versionType": "git"}, {"version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285", "lessThan": "6d25ffca055a77787c21a36b66c253f76239411b", "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/ipv4/cipso_ipv4.c"], "versions": [{"version": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "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": "6.10", "versionEndExcluding": "6.12.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.2.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b965977126a90e01825814c859ba4788691eddd3"}, {"url": "https://git.kernel.org/stable/c/2200fe1d6148b78e1b8f00f4b2bd47760015077f"}, {"url": "https://git.kernel.org/stable/c/6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0"}, {"url": "https://git.kernel.org/stable/c/6d25ffca055a77787c21a36b66c253f76239411b"}], "title": "cipso: adjust cached option offsets when removing CIPSO", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv4/cipso_ipv4.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b965977126a90e01825814c859ba4788691eddd3", "status": "affected", "version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285", "versionType": "git"}, {"lessThan": "2200fe1d6148b78e1b8f00f4b2bd47760015077f", "status": "affected", "version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285", "versionType": "git"}, {"lessThan": "6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0", "status": "affected", "version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285", "versionType": "git"}, {"lessThan": "6d25ffca055a77787c21a36b66c253f76239411b", "status": "affected", "version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv4/cipso_ipv4.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.10"}, {"lessThan": "6.10", "status": "unaffected", "version": "0", "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\ncipso: adjust cached option offsets when removing CIPSO\n\ncipso_v4_skbuff_delattr() removes the CIPSO bytes but does not adjust\ncached offsets for options that follow them.\n\nFor example, with a valid 10-byte CIPSO option followed by a seven-byte\nRR option, parsing records rr at offset 30. Removing CIPSO moves RR to\noffset 20, while the cached offset remains 30. Consumers such as\nip_forward_options() and __ip_options_echo() then access the wrong bytes;\nthe latter may interpret packet data as the option length and copy it into\nfixed-size option storage.\n\nMirror cipso_v4_delopt() and subtract cipso_len from the srr, rr, ts and\nrouter_alert offsets when they follow CIPSO. cipso_len is the distance\nthe first memmove() shifts those options. The later header move and\nnetwork-header reset relocate the bytes and their offset base together."}], "id": "CVE-2026-99064", "lastModified": "2026-10-24T14:16:54.507", "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": "2026-10-23T13:17:30.253", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2200fe1d6148b78e1b8f00f4b2bd47760015077f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6d25ffca055a77787c21a36b66c253f76239411b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b965977126a90e01825814c859ba4788691eddd3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: cipso: adjust cached option offsets when removing CIPSO", "id": "2559696", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2559696"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in the Linux kernel. When removing Commercial IP Security Option (CIPSO) attributes from a network packet, the kernel does not adjust the cached offsets of subsequent IP options. A remote attacker could exploit this vulnerability by sending specially crafted IPv4 packets, causing the system to read incorrect packet data and copy it into fixed-size memory buffers. This flaw can result in memory corruption or a Denial of Service (DoS)."], "name": "CVE-2026-99064", "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": "Affected", "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": "Not 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": "2026-10-23T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-99064\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-99064\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-99064.mbox"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[89aa3619d141d6cfb6040a561aebb6d99d3e2285,b965977126a90e01825814c859ba4788691eddd3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[89aa3619d141d6cfb6040a561aebb6d99d3e2285,2200fe1d6148b78e1b8f00f4b2bd47760015077f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[89aa3619d141d6cfb6040a561aebb6d99d3e2285,6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[89aa3619d141d6cfb6040a561aebb6d99d3e2285,6d25ffca055a77787c21a36b66c253f76239411b)"}}], "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": "6.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.10)"}}, {"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": "[89aa3619d141d6cfb6040a561aebb6d99d3e2285,b965977126a90e01825814c859ba4788691eddd3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[89aa3619d141d6cfb6040a561aebb6d99d3e2285,2200fe1d6148b78e1b8f00f4b2bd47760015077f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[89aa3619d141d6cfb6040a561aebb6d99d3e2285,6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[89aa3619d141d6cfb6040a561aebb6d99d3e2285,6d25ffca055a77787c21a36b66c253f76239411b)"}}], "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": "6.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.10)"}}, {"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": "2026-10-23T15:45:16.728891+00:00", "updated": "2026-10-27T19:15:08.154240+00:00", "vendors": ["linux", "linux$PRODUCT$linux", "linux$PRODUCT$linux_kernel"]}