CVE-2026-80637

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/netfilter/nf_synproxy_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b30a2d56ee47282f6a46cb2f50e315b2414851fe", "status": "affected", "version": "48b1de4c110a7afa4b85862f6c75af817db26fad", "versionType": "git"}, {"lessThan": "95cda0446f51077c343fdd8264be2737eb25a6c3", "status": "affected", "version": "48b1de4c110a7afa4b85862f6c75af817db26fad", "versionType": "git"}, {"lessThan": "2b8e7aaa38002d8ee2f48d87b1f392eadd8e98c4", "status": "affected", "version": "48b1de4c110a7afa4b85862f6c75af817db26fad", "versionType": "git"}, {"lessThan": "5c9c67cf7a3d16051dfb90e98836f530964dfb8e", "status": "affected", "version": "48b1de4c110a7afa4b85862f6c75af817db26fad", "versionType": "git"}, {"lessThan": "ea3d2caa5bfacf5db5c1cad521ca5d9144edd9a7", "status": "affected", "version": "48b1de4c110a7afa4b85862f6c75af817db26fad", "versionType": "git"}, {"lessThan": "992c20bc8a4aba220c8b95b467d049289778dad6", "status": "affected", "version": "48b1de4c110a7afa4b85862f6c75af817db26fad", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/netfilter/nf_synproxy_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.12"}, {"lessThan": "3.12", "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": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "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\nnetfilter: synproxy: fix unaligned memory access in timestamp adjustment\n\nUse get_unaligned_be32() and put_unaligned_be32() to safely read and\nwrite the timestamp fields. This prevents performance degradation due to\nunaligned memory access or even a crash on strict alignment\narchitectures.\n\nThis follows the implementation of timestamp parsing in the networking\nstack at tcp_parse_options() and synproxy_parse_options()."}], "id": "CVE-2026-80637", "lastModified": "2026-10-30T13:20:08.953", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-80637", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:19:14.142885Z", "version": "2.0.3"}}]}, "published": "2026-08-28T08:16:48.620", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2b8e7aaa38002d8ee2f48d87b1f392eadd8e98c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5c9c67cf7a3d16051dfb90e98836f530964dfb8e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/95cda0446f51077c343fdd8264be2737eb25a6c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/992c20bc8a4aba220c8b95b467d049289778dad6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b30a2d56ee47282f6a46cb2f50e315b2414851fe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ea3d2caa5bfacf5db5c1cad521ca5d9144edd9a7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: netfilter: synproxy: fix unaligned memory access in timestamp adjustment", "id": "2525460", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525460"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-468", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: synproxy: fix unaligned memory access in timestamp adjustment\nUse get_unaligned_be32() and put_unaligned_be32() to safely read and\nwrite the timestamp fields. This prevents performance degradation due to\nunaligned memory access or even a crash on strict alignment\narchitectures.\nThis follows the implementation of timestamp parsing in the networking\nstack at tcp_parse_options() and synproxy_parse_options().", "A flaw was found in the Linux kernel's netfilter synproxy component. This vulnerability is due to unaligned memory access when adjusting timestamp fields. An attacker could potentially trigger this flaw by sending specially crafted network traffic, leading to performance degradation or a system crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-80637", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "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"}], "public_date": "2026-08-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80637\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80637\nhttps://lore.kernel.org/linux-cve-announce/2026082840-CVE-2026-80637-4cf0@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[48b1de4c110a7afa4b85862f6c75af817db26fad,2b8e7aaa38002d8ee2f48d87b1f392eadd8e98c4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[48b1de4c110a7afa4b85862f6c75af817db26fad,5c9c67cf7a3d16051dfb90e98836f530964dfb8e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[48b1de4c110a7afa4b85862f6c75af817db26fad,ea3d2caa5bfacf5db5c1cad521ca5d9144edd9a7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[48b1de4c110a7afa4b85862f6c75af817db26fad,992c20bc8a4aba220c8b95b467d049289778dad6)"}}], "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": "3.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "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": "2026-08-28T12:30:16.809121+00:00", "updated": "2026-09-01T17:30:17.400785+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-364", "CWE-468"]}