CVE-2026-98925 (GCVE-0-2026-98925)
Vulnerability from cvelistv5
Published
2026-10-23 12:05
Modified
2026-10-23 12:05
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: fe735073a50eaa71aceb2e990827fe26f33cddd6 Version: e5c6de5fa025882babf89cecbed80acf49b987fa Version: e5c6de5fa025882babf89cecbed80acf49b987fa Version: e5c6de5fa025882babf89cecbed80acf49b987fa Version: e5c6de5fa025882babf89cecbed80acf49b987fa Version: e5c6de5fa025882babf89cecbed80acf49b987fa Version: f9b4a0b537be7a6e5f002ca64b09dcca9c14e6ed Version: 6.1.32 ≤ Version: 6.3.6 ≤ |
||
{
"containers": {
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{
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"product": "Linux",
"programFiles": [
"net/core/skmsg.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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{
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{
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},
{
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"version": "6.6.158",
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},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.112",
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},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.55",
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},
{
"lessThanOrEqual": "7.2.*",
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"version": "7.2.9",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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{
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003ecopied_seq. However, the\nskb is then delivered to the socket\u0027s 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."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-23T12:05:53.207Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/cf9aefb26a071cb8b6fdd761c27e022a1184946d"
},
{
"url": "https://git.kernel.org/stable/c/dc98def81e3c629e25fcdd5753b1db93aab27ce9"
},
{
"url": "https://git.kernel.org/stable/c/ef6f2182fee6b9721c005ccfc6aec0a47f79bbfa"
},
{
"url": "https://git.kernel.org/stable/c/ae1ffd04e98beefbe5d83335d506b0bcd5c2a6b3"
},
{
"url": "https://git.kernel.org/stable/c/88942054191185c6f8bea5568cbb5614d1e99af9"
},
{
"url": "https://git.kernel.org/stable/c/490a83d6386eec1d29f470c8d7331677fb46c3b7"
}
],
"title": "bpf, sockmap: Fix self-redirect copied_seq double-counting",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-98925",
"datePublished": "2026-10-23T12:05:53.207Z",
"dateReserved": "2026-09-25T10:25:14.380Z",
"dateUpdated": "2026-10-23T12:05:53.207Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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