CVE-2026-64554High· 8.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: fix stale prevhdr pointer in br_ip6_fragment() br_ip6_fragment() gets prevhdr, a pointer into the skb head, from ip6_find_1stfragopt(), then calls s…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.3%
In the Linux kernel, the following vulnerability has been resolved:
netfilter: bridge: fix stale prevhdr pointer in br_ip6_fragment()
br_ip6_fragment() gets prevhdr, a pointer into the skb head, from ip6_find_1stfragopt(), then calls skb_checksum_help(). For a cloned skb skb_checksum_help() reallocates the head via pskb_expand_head(), leaving prevhdr dangling. It is later dereferenced in ip6_frag_next(), causing a use-after-free write.
Save prevhdr's offset before skb_checksum_help() and recompute it after, like commit ef0efcd3bd3f ("ipv6: Fix dangling pointer when ipv6 fragment").
BUG: KASAN: slab-use-after-free in ip6_frag_next (net/ipv6/ip6_output.c:857) Write of size 1 at addr ffff888013ff5016 by task exploit/141 Call Trace: ... kasan_report (mm/kasan/report.c:595) ip6_frag_next (net/ipv6/ip6_output.c:857) br_ip6_fragment (net/ipv6/netfilter.c:212) nf_ct_bridge_post (net/bridge/netfilter/nf_conntrack_bridge.c:407) nf_hook_slow (net/netfilter/core.c:619) br_forward_finish (net/bridge/br_forward.c:66) __br_forward (net/bridge/br_forward.c:115) maybe_deliver (net/bridge/br_forward.c:191) br_flood (net/bridge/br_forward.c:245) br_handle_frame_finish (net/bridge/br_input.c:229) br_handle_frame (net/bridge/br_input.c:442) ... packet_sendmsg (net/packet/af_packet.c:3114) ... do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) Kernel panic - not syncing: Fatal exception in interrupt
Linux >= 764dd163ac922f8683b5bcd3007251ce7b26cd33 < 8c10778ec674b67a07ea042fcba64270f3f38a5aLinux >= 764dd163ac922f8683b5bcd3007251ce7b26cd33 < 2731efa6364e47934c96eb69e01ea131e8af8030Linux >= 764dd163ac922f8683b5bcd3007251ce7b26cd33 < 00c06ef8c018493943891a7d0ca82b71b24f3180Linux >= 764dd163ac922f8683b5bcd3007251ce7b26cd33 < c141f69d0a0fb16964dbc293650047e69bda8af7Linux >= 764dd163ac922f8683b5bcd3007251ce7b26cd33 < f2e6596d10783557aeb9668da2a3b4d19deb2001Linux >= 764dd163ac922f8683b5bcd3007251ce7b26cd33 < 1c4f67c89fd27c4df4c70b135c2c59627698b3c0Linux >= 764dd163ac922f8683b5bcd3007251ce7b26cd33 < 4ac981a8b7ce7aec99a52d08f8a8953e8e120067Linux >= 764dd163ac922f8683b5bcd3007251ce7b26cd33 < 86f3ce81dd2b4b0aa2c3016c989a943e4b1b643dLinux 5.3Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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