CVE-2026-68119

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68119", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.369Z", "datePublished": "2026-08-10T11:58:39.026Z", "dateUpdated": "2026-08-17T04:59:09.650Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:59:09.650Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: initialize standalone TCP-AO response padding\n\ntcp_v4_send_ack() and tcp_v6_send_response() construct standalone TCP\nresponses with TCP-AO options. The option length carries the actual MAC\nlength, but the TCP header length includes the option rounded up to a\nfour-byte boundary.\n\ntcp_ao_hash_hdr() writes the MAC only. Thus, when the MAC length is not\nfour-byte aligned, the one to three bytes after the MAC are left\nuninitialized and may be transmitted. For the normal TCP-AO hashing\nmode, those bytes also have to be initialized before computing the MAC.\n\nInitialize only the alignment padding in the TCP-AO branches, before\nhashing the header. Use TCPOPT_NOP, as in the normal TCP-AO output path.\nThis avoids adding work to non-AO TCP responses while preserving a valid\nauthenticated header."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - Remote attackers reach tcp_v4_send_ack() and tcp_v6_send_response() by sending IPv4/IPv6 TCP segments into tcp_v4_rcv()/tcp_v6_rcv() SYN-RECV, TIME-WAIT, and reset paths that build standalone TCP-AO-signed ACK/RST replies transmitted back over the network.\nAC:L - On Internet-facing TCP-AO deployments (BGP/route-server successors to TCP-MD5), an attacker reliably elicits qualifying standalone responses by sending crafted TCP segments; no race, timing lottery, or uncontrollable memory layout is required beyond the peer using a non-4-byte-aligned MAC length.\nPR:N - The uninitialized bytes are returned to the remote packet sender in standalone TCP-AO ACK/RST replies; triggering requires only network reachability to a TCP-AO-enabled listener or an existing TCP-AO TIME-WAIT socket, with no local credentials on the victim host.\nUI:N - No end-user action is needed beyond normal exposure of a TCP-AO-protected network service; the attacker alone sends the triggering TCP segments and captures the padded replies.\nS:U - Kernel stack or skb memory is disclosed to a remote TCP peer within the same host kernel security authority; this is not a VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - One to three uninitialized bytes in TCP-AO option alignment padding from the on-stack IPv4 response buffer or IPv6 skb head are transmitted on every qualifying standalone ACK/RST and can be harvested repeatedly to recover kernel stack or skb contents.\nI:N - The bug only fails to initialize alignment padding before transmission; it does not write to or corrupt kernel, socket, or application memory.\nA:N - Standalone TCP-AO responses are still transmitted successfully with no kernel oops, panic, hang, or denial of service; only confidentiality of the leaked padding bytes is affected."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/tcp_ipv4.c", "net/ipv6/tcp_ipv6.c"], "versions": [{"version": "decde2586b34b99684faff1eab41e5c496c27fb6", "lessThan": "bbb7db8c74b0b5d17a695136f0f0806ecd0118f6", "status": "affected", "versionType": "git"}, {"version": "decde2586b34b99684faff1eab41e5c496c27fb6", "lessThan": "fadaff3f66e124c3a62237f9c881819a8ac90309", "status": "affected", "versionType": "git"}, {"version": "decde2586b34b99684faff1eab41e5c496c27fb6", "lessThan": "a859b280441fb02f64ed4037f03d5c0c34a7a595", "status": "affected", "versionType": "git"}, {"version": "decde2586b34b99684faff1eab41e5c496c27fb6", "lessThan": "e1a9d3cc11829c5414a75eb39c704f461936eb24", "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/tcp_ipv4.c", "net/ipv6/tcp_ipv6.c"], "versions": [{"version": "6.7", "status": "affected"}, {"version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "6.7", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/bbb7db8c74b0b5d17a695136f0f0806ecd0118f6"}, {"url": "https://git.kernel.org/stable/c/fadaff3f66e124c3a62237f9c881819a8ac90309"}, {"url": "https://git.kernel.org/stable/c/a859b280441fb02f64ed4037f03d5c0c34a7a595"}, {"url": "https://git.kernel.org/stable/c/e1a9d3cc11829c5414a75eb39c704f461936eb24"}], "title": "tcp: initialize standalone TCP-AO response padding", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv4/tcp_ipv4.c", "net/ipv6/tcp_ipv6.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "bbb7db8c74b0b5d17a695136f0f0806ecd0118f6", "status": "affected", "version": "decde2586b34b99684faff1eab41e5c496c27fb6", "versionType": "git"}, {"lessThan": "fadaff3f66e124c3a62237f9c881819a8ac90309", "status": "affected", "version": "decde2586b34b99684faff1eab41e5c496c27fb6", "versionType": "git"}, {"lessThan": "a859b280441fb02f64ed4037f03d5c0c34a7a595", "status": "affected", "version": "decde2586b34b99684faff1eab41e5c496c27fb6", "versionType": "git"}, {"lessThan": "e1a9d3cc11829c5414a75eb39c704f461936eb24", "status": "affected", "version": "decde2586b34b99684faff1eab41e5c496c27fb6", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv4/tcp_ipv4.c", "net/ipv6/tcp_ipv6.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.7"}, {"lessThan": "6.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "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\ntcp: initialize standalone TCP-AO response padding\n\ntcp_v4_send_ack() and tcp_v6_send_response() construct standalone TCP\nresponses with TCP-AO options. The option length carries the actual MAC\nlength, but the TCP header length includes the option rounded up to a\nfour-byte boundary.\n\ntcp_ao_hash_hdr() writes the MAC only. Thus, when the MAC length is not\nfour-byte aligned, the one to three bytes after the MAC are left\nuninitialized and may be transmitted. For the normal TCP-AO hashing\nmode, those bytes also have to be initialized before computing the MAC.\n\nInitialize only the alignment padding in the TCP-AO branches, before\nhashing the header. Use TCPOPT_NOP, as in the normal TCP-AO output path.\nThis avoids adding work to non-AO TCP responses while preserving a valid\nauthenticated header."}], "id": "CVE-2026-68119", "lastModified": "2026-08-17T05:18:11.437", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-10T13:19:56.960", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a859b280441fb02f64ed4037f03d5c0c34a7a595"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bbb7db8c74b0b5d17a695136f0f0806ecd0118f6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e1a9d3cc11829c5414a75eb39c704f461936eb24"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fadaff3f66e124c3a62237f9c881819a8ac90309"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Information disclosure in TCP-AO due to uninitialized padding", "id": "2513270", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513270"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-908", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntcp: initialize standalone TCP-AO response padding\ntcp_v4_send_ack() and tcp_v6_send_response() construct standalone TCP\nresponses with TCP-AO options. The option length carries the actual MAC\nlength, but the TCP header length includes the option rounded up to a\nfour-byte boundary.\ntcp_ao_hash_hdr() writes the MAC only. Thus, when the MAC length is not\nfour-byte aligned, the one to three bytes after the MAC are left\nuninitialized and may be transmitted. For the normal TCP-AO hashing\nmode, those bytes also have to be initialized before computing the MAC.\nInitialize only the alignment padding in the TCP-AO branches, before\nhashing the header. Use TCPOPT_NOP, as in the normal TCP-AO output path.\nThis avoids adding work to non-AO TCP responses while preserving a valid\nauthenticated header.", "A flaw was found in the Linux kernel's TCP Authentication Option (TCP-AO) implementation. When the kernel constructs standalone TCP responses with TCP-AO options, padding bytes in the TCP header may be left uninitialized. If the Message Authentication Code (MAC) length is not four-byte aligned, these uninitialized bytes could be transmitted. This can lead to the disclosure of sensitive information to a remote attacker."], "name": "CVE-2026-68119", "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": "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"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T11:58:39Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68119\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68119\nhttps://git.kernel.org/stable/c/a859b280441fb02f64ed4037f03d5c0c34a7a595\nhttps://git.kernel.org/stable/c/bbb7db8c74b0b5d17a695136f0f0806ecd0118f6\nhttps://git.kernel.org/stable/c/e1a9d3cc11829c5414a75eb39c704f461936eb24\nhttps://git.kernel.org/stable/c/fadaff3f66e124c3a62237f9c881819a8ac90309"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[decde2586b34b99684faff1eab41e5c496c27fb6,bbb7db8c74b0b5d17a695136f0f0806ecd0118f6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[decde2586b34b99684faff1eab41e5c496c27fb6,fadaff3f66e124c3a62237f9c881819a8ac90309)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[decde2586b34b99684faff1eab41e5c496c27fb6,a859b280441fb02f64ed4037f03d5c0c34a7a595)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[decde2586b34b99684faff1eab41e5c496c27fb6,e1a9d3cc11829c5414a75eb39c704f461936eb24)"}}], "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": "generic", "value": "6.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc5,*]"}}], "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": "2026-08-10T13:45:03.571701+00:00", "updated": "2026-08-14T00:15:04.822084+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}