{"id":"DEBIAN-CVE-2026-98643","details":"In the Linux kernel, the following vulnerability has been resolved:  bpf: Fix out-of-bounds read of rtt_min in sock_ops  A sockops prog reading skops-\u003ertt_min never checks the sk type: on the tcp_conn_request() path sock_ops-\u003esk is a request_sock (non-full), and the ctx rewrite casts it to a tcp_sock (full) and reads rtt_min past the end of the request_sock, returning dirty adjacent memory.  \tSEC(\"sockops\") \tint prog(struct bpf_sock_ops *skops) \t{ \t\tswitch (skops-\u003eop) { \t\tcase BPF_SOCK_OPS_RWND_INIT: \t\t\tleak = skops-\u003ertt_min;   /* reads the request_sock OOB */ \t\t... \t\t} \t}  For instance one such read returned rtt_min=0xffff8881, the high half of a leaked kernel pointer.  Guarding that cast is exactly what SOCK_OPS_GET_FIELD() does -- it checks is_locked_tcp_sock and returns 0 when sock_ops-\u003esk is not a locked full socket. Every other tcp_sock field in sock_ops goes through it; rtt_min is the only one open-coded, so it skips the check.  Read rtt_min through SOCK_OPS_GET_FIELD() too. rtt_min is a bit special: it is a struct minmax and we only want the current min, so pass rtt_min.s[0].v. That is equivalent to the old hand-computed offset  \toffsetof(struct tcp_sock, rtt_min) + sizeof_field(struct minmax_sample, t)  (s[0] sits at rtt_min + 0 and .v at + sizeof(.t), i.e. what minmax_get() returns), so the loaded field is unchanged and only the full-sock guard is added. The two BUILD_BUG_ON()s that protected the hand-computed offset are no longer needed.  Before patch:  \t0: r1 = *(u64 *)(r1 +0)      ; r1 = skops-\u003esk \t1: r1 = *(u32 *)(r1 +2324)   ; ((tcp_sock *)sk)-\u003ertt_min.s[0].v  After patch:  \t0: *(u64 *)(r1 +56) = r9 \t1: r9 = *(u8 *)(r1 +50)      ; is_locked_tcp_sock \t2: if r9 == 0 goto pc+4      ; not a locked full sock -\u003e 0 \t3: r9 = *(u64 *)(r1 +56) \t4: r1 = *(u64 *)(r1 +0)      ; r1 = skops-\u003esk \t5: r1 = *(u32 *)(r1 +2324)   ; rtt_min.s[0].v \t6: goto pc+2 \t7: r9 = *(u64 *)(r1 +56) \t8: r1 = 0","modified":"2026-10-19T05:00:29.620381965Z","published":"2026-10-18T17:47:32.076338614Z","upstream":["CVE-2026-98643"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-98643"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.190-1"}]}],"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","6.1.180-1","6.1.187-1","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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