bpf, sockmap: Fix self-redirect copied_seq double-counting

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98925
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-23 13:17:13 UTC
Updated2026-10-23 13:17:13 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected fe735073a50eaa71aceb2e990827fe26f33cddd6 cf9aefb26a071cb8b6fdd761c27e022a1184946d git Not specified
CNA Linux Linux affected e5c6de5fa025882babf89cecbed80acf49b987fa dc98def81e3c629e25fcdd5753b1db93aab27ce9 git Not specified
CNA Linux Linux affected e5c6de5fa025882babf89cecbed80acf49b987fa ef6f2182fee6b9721c005ccfc6aec0a47f79bbfa git Not specified
CNA Linux Linux affected e5c6de5fa025882babf89cecbed80acf49b987fa ae1ffd04e98beefbe5d83335d506b0bcd5c2a6b3 git Not specified
CNA Linux Linux affected e5c6de5fa025882babf89cecbed80acf49b987fa 88942054191185c6f8bea5568cbb5614d1e99af9 git Not specified
CNA Linux Linux affected e5c6de5fa025882babf89cecbed80acf49b987fa 490a83d6386eec1d29f470c8d7331677fb46c3b7 git Not specified
CNA Linux Linux affected f9b4a0b537be7a6e5f002ca64b09dcca9c14e6ed git Not specified
CNA Linux Linux affected 6.1.32 6.1.189 semver Not specified
CNA Linux Linux affected 6.3.6 6.4 semver Not specified
CNA Linux Linux affected 6.4 Not specified
CNA Linux Linux unaffected 6.4 semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ef6f2182fee6b9721c005ccfc6aec0a47f79bbfa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/88942054191185c6f8bea5568cbb5614d1e99af9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ae1ffd04e98beefbe5d83335d506b0bcd5c2a6b3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/490a83d6386eec1d29f470c8d7331677fb46c3b7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cf9aefb26a071cb8b6fdd761c27e022a1184946d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dc98def81e3c629e25fcdd5753b1db93aab27ce9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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