CVE-2026-72374 (GCVE-0-2026-72374)
Vulnerability from cvelistv5
Published
2026-08-15 05:56
Modified
2026-08-17 05:43
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
afs: Fix callback service message parsers to pass through -EAGAIN
The AFS filesystem client uses an rxrpc server to listen for callback
notifications. Each callback call type handler has a delivery function
that parses the incoming request stream, and this should return -EAGAIN the
last packet hasn't yet been seen, but all currently queued received data is
consumed. afs_extract_data() does this, but the -EAGAIN return is switched
to 0 inadvertantly
Fix callback service message parsers to pass through -EAGAIN
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 Version: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 Version: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 Version: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 Version: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 Version: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 Version: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 Version: d001648ec7cf8b21ae9eec8b9ba4a18295adfb14 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/afs/cmservice.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"version": "d001648ec7cf8b21ae9eec8b9ba4a18295adfb14",
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"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.9"
},
{
"lessThan": "4.9",
"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"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
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"versionEndExcluding": "5.10.261",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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\nafs: Fix callback service message parsers to pass through -EAGAIN\n\nThe AFS filesystem client uses an rxrpc server to listen for callback\nnotifications. Each callback call type handler has a delivery function\nthat parses the incoming request stream, and this should return -EAGAIN the\nlast packet hasn\u0027t yet been seen, but all currently queued received data is\nconsumed. afs_extract_data() does this, but the -EAGAIN return is switched\nto 0 inadvertantly\n\nFix callback service message parsers to pass through -EAGAIN"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - Remote RxRPC traffic to the kafs cache manager on UDP/TCP port 7001 reaches afs_deliver_cb_init_call_back_state3() and afs_deliver_cb_probe_uuid() via rxrpc incoming-call handling (afs_rx_new_call \u2192 afs_deliver_cm_op_id \u2192 afs_cm_incoming_call \u2192 deliver parsers).\nAC:L - An attacker who controls an established callback RxRPC session can reliably force -EAGAIN by fragmenting CB.InitCallBackState3 or CB.ProbeUuid DATA across multiple packets; no special memory layout, races beyond attacker pacing, or rare victim state is required.\nPR:N - No local Linux account or capabilities on the victim are needed; exploitation is driven by a remote RxRPC peer sending fragmented cache-manager callbacks after the encrypted handshake on the callback socket (minimum RXRPC_SECURITY_ENCRYPT).\nUI:N - No victim user action (mounting AFS, opening files, or clicking anything) is required at exploit time; only an active kafs client with its per-net callback listener is needed as deployment context.\nS:U - Impact is confined to kernel/AFS cache-manager state on the victim host (NULL dereference oops, panic, or callback-protocol disruption) and does not cross VM, IOMMU, or sandbox security boundaries.\nC:N - The -EAGAIN mishandling returns success before UUID unmarshalling, leaving call-\u003erequest NULL; SRXAFSCB_ProbeUuid passes that pointer to memcmp(), causing a kernel fault without attacker-visible disclosure of victim data.\nI:N - The failure mode is premature parser completion and a NULL-pointer memcmp in SRXAFSCB_ProbeUuid (plus possible premature CM replies on InitCallBackState3); no arbitrary kernel write, heap corruption, or code-execution primitive is demonstrated.\nA:H - Treating -EAGAIN as success queues SRXAFSCB_ProbeUuid while call-\u003erequest is still NULL, and memcmp() on that pointer causes a kernel oops/panic; a remote peer can retrigger this on demand with fragmented CB.ProbeUuid callbacks."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:43:27.599Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/26b737b3769e92493fe94c34620399d93ca231ae"
},
{
"url": "https://git.kernel.org/stable/c/09c67a7ded481482155b836c8c7f078a3075f8de"
},
{
"url": "https://git.kernel.org/stable/c/239cd337c9d047e7097f5b2ebbb41ddfb8180bc6"
},
{
"url": "https://git.kernel.org/stable/c/5a39b145a8fb49f316e7ec1f29ba51d68095c7e4"
},
{
"url": "https://git.kernel.org/stable/c/772850871a2e772e26f9d93f1e9ddd413b3eeaa4"
},
{
"url": "https://git.kernel.org/stable/c/0acbc09d2aca0432af45cec114f20d55ceafaec4"
},
{
"url": "https://git.kernel.org/stable/c/f14dd036fad3d359f26f1282199cec06b3a9362b"
},
{
"url": "https://git.kernel.org/stable/c/0f36469d7ce98b362934113c550d08bb0c784231"
}
],
"title": "afs: Fix callback service message parsers to pass through -EAGAIN",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72374",
"datePublished": "2026-08-15T05:56:09.182Z",
"dateReserved": "2026-08-09T03:40:39.922Z",
"dateUpdated": "2026-08-17T05:43:27.599Z",
"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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