201 lines
11 KiB
JSON
201 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-74646",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-15T05:44:03.923Z",
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"datePublished": "2026-08-22T15:32:23.378Z",
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"dateUpdated": "2026-08-25T05:41:04.331Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-25T05:41:04.331Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: take fl->lock 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->mmaps onto\ncctx->invoke_interrupted_mmaps. This list_del()/list_add_tail() walk\nruns without holding fl->lock, the lock that serialises fl->mmaps in\nfastrpc_req_mmap() and fastrpc_req_munmap() everywhere else.\n\nTake fl->lock around the move, matching every other fl->mmaps accessor."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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's 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->mmaps 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->mmaps reliably causes kernel oops/panic during subsequent mmap/munmap or user teardown; repeated ioctl racing can crash or hang the device."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/misc/fastrpc.c"
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],
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"versions": [
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{
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"version": "76e8e4ace1ed2c97dba3b1370e0e105e07c572bc",
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"lessThan": "3f265e405e5ef85030c3777262e18bb556bc8724",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "76e8e4ace1ed2c97dba3b1370e0e105e07c572bc",
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"lessThan": "a902fe1f80f58a2335b6be1131866f827ec44d1a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "76e8e4ace1ed2c97dba3b1370e0e105e07c572bc",
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"lessThan": "af6345159abcbaa550518f31990d2a9558c2d369",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "76e8e4ace1ed2c97dba3b1370e0e105e07c572bc",
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"lessThan": "efd02f8d1a7449f15809bc18d3cd41aafea75d7e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "76e8e4ace1ed2c97dba3b1370e0e105e07c572bc",
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"lessThan": "b85a0e91d7d6cd06a53c881a46f749cfcef416a2",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/misc/fastrpc.c"
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],
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"versions": [
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{
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"version": "6.2",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.2",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.152",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.104",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.45",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.9",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2",
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"versionEndExcluding": "6.6.152"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2",
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"versionEndExcluding": "6.12.104"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2",
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"versionEndExcluding": "7.1.9"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2",
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"versionEndExcluding": "7.2"
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}
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/3f265e405e5ef85030c3777262e18bb556bc8724"
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},
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{
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"url": "https://git.kernel.org/stable/c/a902fe1f80f58a2335b6be1131866f827ec44d1a"
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},
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{
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"url": "https://git.kernel.org/stable/c/af6345159abcbaa550518f31990d2a9558c2d369"
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},
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{
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"url": "https://git.kernel.org/stable/c/efd02f8d1a7449f15809bc18d3cd41aafea75d7e"
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},
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{
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"url": "https://git.kernel.org/stable/c/b85a0e91d7d6cd06a53c881a46f749cfcef416a2"
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}
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],
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"title": "misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke",
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} |