CVE-2026-74646 (GCVE-0-2026-74646)
Vulnerability from cvelistv5
Published
2026-08-22 15:32
Modified
2026-08-25 05:41
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke
When an invoke is interrupted by a signal,
wait_for_completion_interruptible() returns -ERESTARTSYS and
fastrpc_internal_invoke() moves every buffer from fl->mmaps onto
cctx->invoke_interrupted_mmaps. This list_del()/list_add_tail() walk
runs without holding fl->lock, the lock that serialises fl->mmaps in
fastrpc_req_mmap() and fastrpc_req_munmap() everywhere else.
Take fl->lock around the move, matching every other fl->mmaps accessor.
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/misc/fastrpc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "3f265e405e5ef85030c3777262e18bb556bc8724",
"status": "affected",
"version": "76e8e4ace1ed2c97dba3b1370e0e105e07c572bc",
"versionType": "git"
},
{
"lessThan": "a902fe1f80f58a2335b6be1131866f827ec44d1a",
"status": "affected",
"version": "76e8e4ace1ed2c97dba3b1370e0e105e07c572bc",
"versionType": "git"
},
{
"lessThan": "af6345159abcbaa550518f31990d2a9558c2d369",
"status": "affected",
"version": "76e8e4ace1ed2c97dba3b1370e0e105e07c572bc",
"versionType": "git"
},
{
"lessThan": "efd02f8d1a7449f15809bc18d3cd41aafea75d7e",
"status": "affected",
"version": "76e8e4ace1ed2c97dba3b1370e0e105e07c572bc",
"versionType": "git"
},
{
"lessThan": "b85a0e91d7d6cd06a53c881a46f749cfcef416a2",
"status": "affected",
"version": "76e8e4ace1ed2c97dba3b1370e0e105e07c572bc",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/misc/fastrpc.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.2"
},
{
"lessThan": "6.2",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.9",
"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": "6.6.152",
"versionStartIncluding": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.104",
"versionStartIncluding": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.45",
"versionStartIncluding": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.9",
"versionStartIncluding": "6.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "6.2",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: take fl-\u003elock when moving mmaps on interrupted invoke\n\nWhen an invoke is interrupted by a signal,\nwait_for_completion_interruptible() returns -ERESTARTSYS and\nfastrpc_internal_invoke() moves every buffer from fl-\u003emmaps onto\ncctx-\u003einvoke_interrupted_mmaps. This list_del()/list_add_tail() walk\nruns without holding fl-\u003elock, the lock that serialises fl-\u003emmaps in\nfastrpc_req_mmap() and fastrpc_req_munmap() everywhere else.\n\nTake fl-\u003elock around the move, matching every other fl-\u003emmaps accessor."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Reachable only through local ioctl on the Qualcomm FastRPC miscdevice (/dev/fastrpc-*); communication with the DSP is internal rpmsg/glink IPC on the SoC, not via network or adjacent wireless protocols.\nAC:L - Attacker controls both sides: one thread blocks in FASTRPC_IOCTL_INVOKE, delivers a signal to force -ERESTARTSYS, and another thread issues concurrent FASTRPC_IOCTL_MMAP/MUNMAP on the same fd; the race can be retried until it wins.\nPR:L - fastrpc_device_ioctl has no capability check; on Qualcomm/Android deployments non-root processes with FastRPC device access (HALs, system services, or unsigned-PD offload clients) can open the node and hit the vulnerable path without real root.\nUI:N - No victim interaction is required beyond the attacker\u0027s own local access; exploitation uses attacker-controlled threads and signals to race ioctls on an already-open FastRPC file descriptor.\nS:U - The bug corrupts kernel linked-list/heap state in the host OS FastRPC driver; impact is local kernel privilege escalation within the same security authority, not a VM escape or IOMMU boundary bypass.\nC:H - Unsynchronized list_del/list_add_tail on fl-\u003emmaps corrupts kernel list pointers and can orphan or double-reference fastrpc_buf objects, enabling use-after-free and kernel memory disclosure primitives.\nI:H - Corrupting mmap tracking list nodes in kernel heap can yield double-free or use-after-free of fastrpc_buf slabs, which are standard primitives for arbitrary kernel write and control-flow hijacking.\nA:H - List corruption on fl-\u003emmaps reliably causes kernel oops/panic during subsequent mmap/munmap or user teardown; repeated ioctl racing can crash or hang the device."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-25T05:41:04.331Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/3f265e405e5ef85030c3777262e18bb556bc8724"
},
{
"url": "https://git.kernel.org/stable/c/a902fe1f80f58a2335b6be1131866f827ec44d1a"
},
{
"url": "https://git.kernel.org/stable/c/af6345159abcbaa550518f31990d2a9558c2d369"
},
{
"url": "https://git.kernel.org/stable/c/efd02f8d1a7449f15809bc18d3cd41aafea75d7e"
},
{
"url": "https://git.kernel.org/stable/c/b85a0e91d7d6cd06a53c881a46f749cfcef416a2"
}
],
"title": "misc: fastrpc: take fl-\u003elock when moving mmaps on interrupted invoke",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74646",
"datePublished": "2026-08-22T15:32:23.378Z",
"dateReserved": "2026-08-15T05:44:03.923Z",
"dateUpdated": "2026-08-25T05:41:04.331Z",
"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…