{"id":"DEBIAN-CVE-2026-64554","details":"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","modified":"2026-09-01T16:06:56.071763008Z","published":"2026-07-27T21:17:08.437Z","upstream":["CVE-2026-64554"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-64554"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.180-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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