CVE-2026-98925
Full vulnerability record from the local CVENow database.
Description
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.
View original CVE JSON
{
"id": "CVE-2026-98925",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-10-23T13:17:13.210",
"lastModified": "2026-10-23T13:17:13.210",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Fix self-redirect copied_seq double-counting\n\nWhen a BPF stream_verdict program redirects an skb back to the same\nsocket (self-redirect with BPF_F_INGRESS), sk_psock_verdict_apply()\ncalls tcp_eat_skb() which advances tcp_sk->copied_seq. However, the\nskb is then delivered to the socket's psock ingress queue and later\nread by tcp_bpf_recvmsg_parser(), which also advances copied_seq via\nthe copied_from_self accounting path. This double-counting causes\ncopied_seq to advance by 2x the actual data length, triggering:\n\n TCP recvmsg seq # bug 2: copied BF2E806, seq BF2E7FD, \\\n\t\t\t rcvnxt BF2E806, fl 0\n WARNING: net/ipv4/tcp.c:2745 at tcp_recvmsg_locked+0x72b/0x2640\n Call Trace:\n tcp_recvmsg+0x10a/0x500\n sock_recvmsg+0x168/0x1d0\n __sys_recvfrom+0x19a/0x2a0\n __x64_sys_recvfrom+0xe4/0x1f0\n do_syscall_64+0xf7/0x530\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n cleanup rbuf bug: copied BF2E806 seq BF2E806 rcvnxt BF2E806\n WARNING: net/ipv4/tcp.c:1609 at tcp_cleanup_rbuf+0xf2/0x1c0\n Call Trace:\n tcp_recvmsg_locked+0x8d1/0x2640\n tcp_recvmsg+0x10a/0x500\n sock_recvmsg+0x168/0x1d0\n __sys_recvfrom+0x19a/0x2a0\n __x64_sys_recvfrom+0xe4/0x1f0\n do_syscall_64+0xf7/0x530\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFix this by converting self-redirect verdict to __SK_PASS at the\nbeginning of sk_psock_verdict_apply(). This bypasses the\n__SK_REDIRECT case entirely (which calls sk_psock_eat_skb), letting\nthe __SK_PASS path queue the skb to the psock ingress queue. The\ndata is then read via tcp_bpf_recvmsg_parser(), which advances\ncopied_seq exactly once through copied_from_self. Cross-socket\nredirects continue through __SK_REDIRECT with sk_psock_eat_skb()\nunchanged."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"net/core/skmsg.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "fe735073a50eaa71aceb2e990827fe26f33cddd6",
"lessThan": "cf9aefb26a071cb8b6fdd761c27e022a1184946d",
"versionType": "git",
"status": "affected"
},
{
"version": "e5c6de5fa025882babf89cecbed80acf49b987fa",
"lessThan": "dc98def81e3c629e25fcdd5753b1db93aab27ce9",
"versionType": "git",
"status": "affected"
},
{
"version": "e5c6de5fa025882babf89cecbed80acf49b987fa",
"lessThan": "ef6f2182fee6b9721c005ccfc6aec0a47f79bbfa",
"versionType": "git",
"status": "affected"
},
{
"version": "e5c6de5fa025882babf89cecbed80acf49b987fa",
"lessThan": "ae1ffd04e98beefbe5d83335d506b0bcd5c2a6b3",
"versionType": "git",
"status": "affected"
},
{
"version": "e5c6de5fa025882babf89cecbed80acf49b987fa",
"lessThan": "88942054191185c6f8bea5568cbb5614d1e99af9",
"versionType": "git",
"status": "affected"
},
{
"version": "e5c6de5fa025882babf89cecbed80acf49b987fa",
"lessThan": "490a83d6386eec1d29f470c8d7331677fb46c3b7",
"versionType": "git",
"status": "affected"
},
{
"version": "f9b4a0b537be7a6e5f002ca64b09dcca9c14e6ed",
"versionType": "git",
"status": "affected"
},
{
"version": "6.1.32",
"lessThan": "6.1.189",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.3.6",
"lessThan": "6.4",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"net/core/skmsg.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.4",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.4",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.189",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.158",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.112",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.55",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.9",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/490a83d6386eec1d29f470c8d7331677fb46c3b7",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/88942054191185c6f8bea5568cbb5614d1e99af9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ae1ffd04e98beefbe5d83335d506b0bcd5c2a6b3",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/cf9aefb26a071cb8b6fdd761c27e022a1184946d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/dc98def81e3c629e25fcdd5753b1db93aab27ce9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ef6f2182fee6b9721c005ccfc6aec0a47f79bbfa",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}