CVE-2026-74427 (GCVE-0-2026-74427)
Vulnerability from cvelistv5
Published
2026-08-15 05:59
Modified
2026-08-17 05:47
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
afs: Fix netns teardown to cancel the preallocation charger
Fix the teardown of an afs network namespace to make sure it cancels the
work item that keeps the preallocated rxrpc call/conn/peer queue charged
before incoming calls are disabled (i.e. listen 0).
Also, if net->live is false because the afs netns is being deleted, make
afs_charge_preallocation() skip charging and make afs_rx_new_call() avoid
requeuing the charger.
(This was found by AI review).
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 Version: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 Version: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 Version: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 Version: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 Version: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 Version: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 Version: 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/afs/rxrpc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "63ccaf1bdf8be2330f47f9b5b233dd3fd04acbd9",
"status": "affected",
"version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"versionType": "git"
},
{
"lessThan": "f5096e18b6b7fbd1c2a1942e275a51bcfdfb2ad1",
"status": "affected",
"version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"versionType": "git"
},
{
"lessThan": "59e8b7652f6cbfb62d377ead0ad553c1b4e39a7a",
"status": "affected",
"version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"versionType": "git"
},
{
"lessThan": "85d5fb80fe4f0cc836b6df83f26de204fe102ff7",
"status": "affected",
"version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"versionType": "git"
},
{
"lessThan": "a33975ff2b6ea47b8f29956403374b1cdd057539",
"status": "affected",
"version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"versionType": "git"
},
{
"lessThan": "b83ecf80e28afb7b6595ba79932e77ca68a5a83d",
"status": "affected",
"version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"versionType": "git"
},
{
"lessThan": "eec89c5f8e1adc1de4824042ef75f62aed804153",
"status": "affected",
"version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"versionType": "git"
},
{
"lessThan": "47694fbc9d24ab6bf210f91e8efe06a10a478064",
"status": "affected",
"version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/afs/rxrpc.c"
],
"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": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.261",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.212",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.178",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "4.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix netns teardown to cancel the preallocation charger\n\nFix the teardown of an afs network namespace to make sure it cancels the\nwork item that keeps the preallocated rxrpc call/conn/peer queue charged\nbefore incoming calls are disabled (i.e. listen 0).\n\nAlso, if net-\u003elive is false because the afs netns is being deleted, make\nafs_charge_preallocation() skip charging and make afs_rx_new_call() avoid\nrequeuing the charger.\n\n(This was found by AI review)."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - Remote RxRPC/UDP traffic to the kafs callback manager on port 7001 reaches afs_rx_new_call through rxrpc incoming-call processing and can requeue charge_preallocation_work that touches per-net AFS state during namespace teardown, matching other network-reachable netns-teardown UAF bugs.\nAC:L - The attacker controls both sides of the race\u2014namespace create/destroy timing via user namespaces or container lifecycle, plus concurrent RxRPC callback floods\u2014and the follow-up fix confirms incoming I/O-thread calls can requeue the charger after listen(0); the window is wide and repeatable.\nPR:N - afs_rx_new_call is invoked during RXRPC_CONN_SERVICE_CHALLENGING before AFS credential verification completes, so a remote peer sending valid CM-service RxRPC DATA can drive the bug; alternatively an unprivileged user obtains CAP_NET_ADMIN via user namespaces to destroy the namespace.\nUI:N - No victim interaction such as mounting AFS volumes or opening files is required; exploitation relies on attacker-driven namespace teardown and/or RxRPC packets, both kernel-level events under attacker or infrastructure control.\nS:U - The UAF corrupts kernel heap objects within the same OS security authority; impact does not cross a VM, IOMMU, or KVM/Xen boundary into a separate security domain.\nC:H - charge_preallocation_work on afs_wq dereferences freed struct afs_net fields (socket, spare_incoming_call, nr_outstanding_calls) after per-net exit; UAF of slab objects enables arbitrary kernel memory disclosure via heap grooming.\nI:H - Continued charging and afs_alloc_call through freed afs_net writes into stale per-net counters and socket state; UAF supports heap spray and arbitrary kernel write or control-flow hijack primitives.\nA:H - Use-after-free on afs_net and its RxRPC socket during teardown causes kernel oops or panic; even without full exploitation the race reliably crashes the host and can be retriggered on demand."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:47:02.011Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/63ccaf1bdf8be2330f47f9b5b233dd3fd04acbd9"
},
{
"url": "https://git.kernel.org/stable/c/f5096e18b6b7fbd1c2a1942e275a51bcfdfb2ad1"
},
{
"url": "https://git.kernel.org/stable/c/59e8b7652f6cbfb62d377ead0ad553c1b4e39a7a"
},
{
"url": "https://git.kernel.org/stable/c/85d5fb80fe4f0cc836b6df83f26de204fe102ff7"
},
{
"url": "https://git.kernel.org/stable/c/a33975ff2b6ea47b8f29956403374b1cdd057539"
},
{
"url": "https://git.kernel.org/stable/c/b83ecf80e28afb7b6595ba79932e77ca68a5a83d"
},
{
"url": "https://git.kernel.org/stable/c/eec89c5f8e1adc1de4824042ef75f62aed804153"
},
{
"url": "https://git.kernel.org/stable/c/47694fbc9d24ab6bf210f91e8efe06a10a478064"
}
],
"title": "afs: Fix netns teardown to cancel the preallocation charger",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74427",
"datePublished": "2026-08-15T05:59:29.053Z",
"dateReserved": "2026-08-15T05:44:03.895Z",
"dateUpdated": "2026-08-17T05:47:02.011Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Loading…
Loading…
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.
Loading…
Loading…