{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74646","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.923Z","datePublished":"2026-08-22T15:32:23.378Z","dateUpdated":"2026-08-25T05:41:04.331Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-25T05:41:04.331Z"},"descriptions":[{"lang":"en","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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"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'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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/fastrpc.c"],"versions":[{"version":"76e8e4ace1ed2c97dba3b1370e0e105e07c572bc","lessThan":"3f265e405e5ef85030c3777262e18bb556bc8724","status":"affected","versionType":"git"},{"version":"76e8e4ace1ed2c97dba3b1370e0e105e07c572bc","lessThan":"a902fe1f80f58a2335b6be1131866f827ec44d1a","status":"affected","versionType":"git"},{"version":"76e8e4ace1ed2c97dba3b1370e0e105e07c572bc","lessThan":"af6345159abcbaa550518f31990d2a9558c2d369","status":"affected","versionType":"git"},{"version":"76e8e4ace1ed2c97dba3b1370e0e105e07c572bc","lessThan":"efd02f8d1a7449f15809bc18d3cd41aafea75d7e","status":"affected","versionType":"git"},{"version":"76e8e4ace1ed2c97dba3b1370e0e105e07c572bc","lessThan":"b85a0e91d7d6cd06a53c881a46f749cfcef416a2","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/fastrpc.c"],"versions":[{"version":"6.2","status":"affected"},{"version":"0","lessThan":"6.2","status":"unaffected","versionType":"semver"},{"version":"6.6.152","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.104","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.45","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.9","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.152"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.12.104"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.18.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"7.1.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"7.2"}]}]}],"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->lock when moving mmaps on interrupted invoke","x_generator":{"engine":"bippy-1.2.0"}}}}