FKIE_CVE-2026-74256
Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-08-17 06:19
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf, sockmap: fix integer overflow in bpf_msg_pop_data() bounds check
start and len are u32, so
u64 last = start + len;
evaluates start + len in 32-bit and wraps before storing it in last.
The bounds check
if (start >= offset + l || last > msg->sg.size)
return -EINVAL;
can then be passed with an out-of-range start/len, after which the pop
loop runs off the end of the scatterlist and sk_msg_shift_left() calls
put_page() on the empty msg->sg.end slot:
Oops: general protection fault, probably for non-canonical address
0xdffffc0000000001: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
RIP: 0010:sk_msg_shift_left net/core/filter.c:2957 [inline]
RIP: 0010:____bpf_msg_pop_data net/core/filter.c:3103 [inline]
RIP: 0010:bpf_msg_pop_data+0x753/0x1a10 net/core/filter.c:2984
Call Trace:
<TASK>
bpf_prog_4cc92c278f4d5d56+0x1b1/0x1e8
bpf_prog_run_pin_on_cpu+0x107/0x320 include/linux/filter.h:746
sk_psock_msg_verdict+0x357/0x7f0 net/core/skmsg.c:934
tcp_bpf_send_verdict net/ipv4/tcp_bpf.c:420 [inline]
tcp_bpf_sendmsg+0x766/0x1ae0 net/ipv4/tcp_bpf.c:583
__sock_sendmsg+0x153/0x1c0 net/socket.c:802
__sys_sendto+0x326/0x430 net/socket.c:2265
__x64_sys_sendto+0xe3/0x100 net/socket.c:2268
do_syscall_64+0x14c/0x480
entry_SYSCALL_64_after_hwframe+0x77/0x7f
</TASK>
Widen the addition with a (u64) cast so the bound is evaluated in
64-bit and a len near U32_MAX no longer wraps below msg->sg.size.
While here, change pop from int to u32. It counts bytes against the
unsigned scatterlist lengths and can never be negative, so the signed
type only invites sign-confusion in the pop loop.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/core/filter.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "9ef44ed6fb0c1db01cfcc3de432a33e719713eb5",
"status": "affected",
"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"versionType": "git"
},
{
"lessThan": "d693c5ed67dabe1ccbf8dcea93075bdc9ffd4ca0",
"status": "affected",
"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"versionType": "git"
},
{
"lessThan": "ba5cc05dae8fce237d191c7ea96b1107a791e548",
"status": "affected",
"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"versionType": "git"
},
{
"lessThan": "c05a0ec1cdced622a1a0c7d85679fe02f31033ec",
"status": "affected",
"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"versionType": "git"
},
{
"lessThan": "17eb9832a10db2f7a80cb429ca2bc5038445a943",
"status": "affected",
"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"versionType": "git"
},
{
"lessThan": "fe09dd288722f1c749b7506c0b3e7841a7d85027",
"status": "affected",
"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"versionType": "git"
},
{
"lessThan": "e09f7bd7273928b4089e6b71f8e992f2b356ca1b",
"status": "affected",
"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"versionType": "git"
},
{
"lessThan": "a48802fb2cd2d1e23651989f8ff4d15e9d5dad54",
"status": "affected",
"version": "7246d8ed4dcce23f7509949a77be15fa9f0e3d28",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/core/filter.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.0"
},
{
"lessThan": "5.0",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: fix integer overflow in bpf_msg_pop_data() bounds check\n\nstart and len are u32, so\n\n\tu64 last = start + len;\n\nevaluates start + len in 32-bit and wraps before storing it in last.\nThe bounds check\n\n\tif (start \u003e= offset + l || last \u003e msg-\u003esg.size)\n\t\treturn -EINVAL;\n\ncan then be passed with an out-of-range start/len, after which the pop\nloop runs off the end of the scatterlist and sk_msg_shift_left() calls\nput_page() on the empty msg-\u003esg.end slot:\n\n Oops: general protection fault, probably for non-canonical address\n 0xdffffc0000000001: 0000 [#1] SMP KASAN PTI\n KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]\n RIP: 0010:sk_msg_shift_left net/core/filter.c:2957 [inline]\n RIP: 0010:____bpf_msg_pop_data net/core/filter.c:3103 [inline]\n RIP: 0010:bpf_msg_pop_data+0x753/0x1a10 net/core/filter.c:2984\n Call Trace:\n \u003cTASK\u003e\n bpf_prog_4cc92c278f4d5d56+0x1b1/0x1e8\n bpf_prog_run_pin_on_cpu+0x107/0x320 include/linux/filter.h:746\n sk_psock_msg_verdict+0x357/0x7f0 net/core/skmsg.c:934\n tcp_bpf_send_verdict net/ipv4/tcp_bpf.c:420 [inline]\n tcp_bpf_sendmsg+0x766/0x1ae0 net/ipv4/tcp_bpf.c:583\n __sock_sendmsg+0x153/0x1c0 net/socket.c:802\n __sys_sendto+0x326/0x430 net/socket.c:2265\n __x64_sys_sendto+0xe3/0x100 net/socket.c:2268\n do_syscall_64+0x14c/0x480\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n \u003c/TASK\u003e\n\nWiden the addition with a (u64) cast so the bound is evaluated in\n64-bit and a len near U32_MAX no longer wraps below msg-\u003esg.size.\n\nWhile here, change pop from int to u32. It counts bytes against the\nunsigned scatterlist lengths and can never be negative, so the signed\ntype only invites sign-confusion in the pop loop."
}
],
"id": "CVE-2026-74256",
"lastModified": "2026-08-17T06:19:18.920",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 8.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.5,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-15T06:22:24.743",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/17eb9832a10db2f7a80cb429ca2bc5038445a943"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/9ef44ed6fb0c1db01cfcc3de432a33e719713eb5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a48802fb2cd2d1e23651989f8ff4d15e9d5dad54"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ba5cc05dae8fce237d191c7ea96b1107a791e548"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/c05a0ec1cdced622a1a0c7d85679fe02f31033ec"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d693c5ed67dabe1ccbf8dcea93075bdc9ffd4ca0"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e09f7bd7273928b4089e6b71f8e992f2b356ca1b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/fe09dd288722f1c749b7506c0b3e7841a7d85027"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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