{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64554", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.796Z", "datePublished": "2026-07-27T20:10:41.726Z", "dateUpdated": "2026-07-27T20:10:41.726Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-27T20:10:41.726Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: fix stale prevhdr pointer in br_ip6_fragment()\n\nbr_ip6_fragment() gets prevhdr, a pointer into the skb head, from\nip6_find_1stfragopt(), then calls skb_checksum_help(). For a cloned skb\nskb_checksum_help() reallocates the head via pskb_expand_head(), leaving\nprevhdr dangling. It is later dereferenced in ip6_frag_next(), causing a\nuse-after-free write.\n\nSave prevhdr's offset before skb_checksum_help() and recompute it after,\nlike commit ef0efcd3bd3f (\"ipv6: Fix dangling pointer when ipv6\nfragment\").\n\n BUG: KASAN: slab-use-after-free in ip6_frag_next (net/ipv6/ip6_output.c:857)\n Write of size 1 at addr ffff888013ff5016 by task exploit/141\n Call Trace:\n ...\n kasan_report (mm/kasan/report.c:595)\n ip6_frag_next (net/ipv6/ip6_output.c:857)\n br_ip6_fragment (net/ipv6/netfilter.c:212)\n nf_ct_bridge_post (net/bridge/netfilter/nf_conntrack_bridge.c:407)\n nf_hook_slow (net/netfilter/core.c:619)\n br_forward_finish (net/bridge/br_forward.c:66)\n __br_forward (net/bridge/br_forward.c:115)\n maybe_deliver (net/bridge/br_forward.c:191)\n br_flood (net/bridge/br_forward.c:245)\n br_handle_frame_finish (net/bridge/br_input.c:229)\n br_handle_frame (net/bridge/br_input.c:442)\n ...\n packet_sendmsg (net/packet/af_packet.c:3114)\n ...\n do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n Kernel panic - not syncing: Fatal exception in interrupt"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/netfilter.c"], "versions": [{"version": "764dd163ac922f8683b5bcd3007251ce7b26cd33", "lessThan": "8c10778ec674b67a07ea042fcba64270f3f38a5a", "status": "affected", "versionType": "git"}, {"version": "764dd163ac922f8683b5bcd3007251ce7b26cd33", "lessThan": "2731efa6364e47934c96eb69e01ea131e8af8030", "status": "affected", "versionType": "git"}, {"version": "764dd163ac922f8683b5bcd3007251ce7b26cd33", "lessThan": "00c06ef8c018493943891a7d0ca82b71b24f3180", "status": "affected", "versionType": "git"}, {"version": "764dd163ac922f8683b5bcd3007251ce7b26cd33", "lessThan": "c141f69d0a0fb16964dbc293650047e69bda8af7", "status": "affected", "versionType": "git"}, {"version": "764dd163ac922f8683b5bcd3007251ce7b26cd33", "lessThan": "f2e6596d10783557aeb9668da2a3b4d19deb2001", "status": "affected", "versionType": "git"}, {"version": "764dd163ac922f8683b5bcd3007251ce7b26cd33", "lessThan": "1c4f67c89fd27c4df4c70b135c2c59627698b3c0", "status": "affected", "versionType": "git"}, {"version": "764dd163ac922f8683b5bcd3007251ce7b26cd33", "lessThan": "4ac981a8b7ce7aec99a52d08f8a8953e8e120067", "status": "affected", "versionType": "git"}, {"version": "764dd163ac922f8683b5bcd3007251ce7b26cd33", "lessThan": "86f3ce81dd2b4b0aa2c3016c989a943e4b1b643d", "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/netfilter.c"], "versions": [{"version": "5.3", "status": "affected"}, {"version": "0", "lessThan": "5.3", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc4", "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": "5.3", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "7.2-rc4"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8c10778ec674b67a07ea042fcba64270f3f38a5a"}, {"url": "https://git.kernel.org/stable/c/2731efa6364e47934c96eb69e01ea131e8af8030"}, {"url": "https://git.kernel.org/stable/c/00c06ef8c018493943891a7d0ca82b71b24f3180"}, {"url": "https://git.kernel.org/stable/c/c141f69d0a0fb16964dbc293650047e69bda8af7"}, {"url": "https://git.kernel.org/stable/c/f2e6596d10783557aeb9668da2a3b4d19deb2001"}, {"url": "https://git.kernel.org/stable/c/1c4f67c89fd27c4df4c70b135c2c59627698b3c0"}, {"url": "https://git.kernel.org/stable/c/4ac981a8b7ce7aec99a52d08f8a8953e8e120067"}, {"url": "https://git.kernel.org/stable/c/86f3ce81dd2b4b0aa2c3016c989a943e4b1b643d"}], "title": "netfilter: bridge: fix stale prevhdr pointer in br_ip6_fragment()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[764dd163ac922f8683b5bcd3007251ce7b26cd33,8c10778ec674b67a07ea042fcba64270f3f38a5a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[764dd163ac922f8683b5bcd3007251ce7b26cd33,2731efa6364e47934c96eb69e01ea131e8af8030)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[764dd163ac922f8683b5bcd3007251ce7b26cd33,00c06ef8c018493943891a7d0ca82b71b24f3180)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[764dd163ac922f8683b5bcd3007251ce7b26cd33,c141f69d0a0fb16964dbc293650047e69bda8af7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[764dd163ac922f8683b5bcd3007251ce8f2e6596d10783557aeb9668da2a3b4d19deb2001)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[764dd163ac922f8683b5bcd3007251ce1c4f67c89fd27c4df4c70b135c2c59627698b3c0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[764dd163ac922f8683b5bcd3007251ce4ac981a8b7ce7aec99a52d08f8a8953e8e120067)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[764dd163ac922f8683b5bcd3007251ce86f3ce81dd2b4b0aa2c3016c989a943e4b1b643d)"}}], "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": "5.3"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.3)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.261,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc4,*]"}}], "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": "2026-07-28T03:45:05.004631+00:00", "updated": "2026-07-28T03:45:05.004664+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}