CVE-2026-98925None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix self-redirect copied_seq double-counting When a BPF stream_verdict program redirects an skb back to the same socket (self-redirect with BPF_F_INGRESS…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 25.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
In the Linux kernel, the following vulnerability has been resolved:
bpf, sockmap: Fix self-redirect copied_seq double-counting
When a BPF stream_verdict program redirects an skb back to the same socket (self-redirect with BPF_F_INGRESS), sk_psock_verdict_apply() calls tcp_eat_skb() which advances tcp_sk->copied_seq. However, the skb is then delivered to the socket's psock ingress queue and later read by tcp_bpf_recvmsg_parser(), which also advances copied_seq via the copied_from_self accounting path. This double-counting causes copied_seq to advance by 2x the actual data length, triggering:
TCP recvmsg seq # bug 2: copied BF2E806, seq BF2E7FD,
rcvnxt BF2E806, fl 0
WARNING: net/ipv4/tcp.c:2745 at tcp_recvmsg_locked+0x72b/0x2640
Call Trace:
tcp_recvmsg+0x10a/0x500
sock_recvmsg+0x168/0x1d0
__sys_recvfrom+0x19a/0x2a0
__x64_sys_recvfrom+0xe4/0x1f0
do_syscall_64+0xf7/0x530
entry_SYSCALL_64_after_hwframe+0x77/0x7f
cleanup rbuf bug: copied BF2E806 seq BF2E806 rcvnxt BF2E806 WARNING: net/ipv4/tcp.c:1609 at tcp_cleanup_rbuf+0xf2/0x1c0 Call Trace: tcp_recvmsg_locked+0x8d1/0x2640 tcp_recvmsg+0x10a/0x500 sock_recvmsg+0x168/0x1d0 __sys_recvfrom+0x19a/0x2a0 __x64_sys_recvfrom+0xe4/0x1f0 do_syscall_64+0xf7/0x530 entry_SYSCALL_64_after_hwframe+0x77/0x7f
Fix this by converting self-redirect verdict to __SK_PASS at the beginning of sk_psock_verdict_apply(). This bypasses the __SK_REDIRECT case entirely (which calls sk_psock_eat_skb), letting the __SK_PASS path queue the skb to the psock ingress queue. The data is then read via tcp_bpf_recvmsg_parser(), which advances copied_seq exactly once through copied_from_self. Cross-socket redirects continue through __SK_REDIRECT with sk_psock_eat_skb() unchanged.
Linux >= fe735073a50eaa71aceb2e990827fe26f33cddd6 < cf9aefb26a071cb8b6fdd761c27e022a1184946dLinux >= e5c6de5fa025882babf89cecbed80acf49b987fa < dc98def81e3c629e25fcdd5753b1db93aab27ce9Linux >= e5c6de5fa025882babf89cecbed80acf49b987fa < ef6f2182fee6b9721c005ccfc6aec0a47f79bbfaLinux >= e5c6de5fa025882babf89cecbed80acf49b987fa < ae1ffd04e98beefbe5d83335d506b0bcd5c2a6b3Linux >= e5c6de5fa025882babf89cecbed80acf49b987fa < 88942054191185c6f8bea5568cbb5614d1e99af9Linux >= e5c6de5fa025882babf89cecbed80acf49b987fa < 490a83d6386eec1d29f470c8d7331677fb46c3b7Linux f9b4a0b537be7a6e5f002ca64b09dcca9c14e6edLinux >= 6.1.32 < 6.1.189Linux >= 6.3.6 < 6.4Linux 6.4Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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