CVE-2026-53161

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53161", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.388Z", "datePublished": "2026-06-25T08:38:42.789Z", "dateUpdated": "2026-08-05T12:33:36.090Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:33:36.090Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: fix use-after-free of fastrpc_user in workqueue context\n\nThere is a race between fastrpc_device_release() and the workqueue\nthat processes DSP responses. When the user closes the file descriptor,\nfastrpc_device_release() frees the fastrpc_user structure. Concurrently,\nan in-flight DSP invocation can complete and fastrpc_rpmsg_callback()\nschedules context cleanup via schedule_work(&ctx->put_work). If the\nworkqueue runs fastrpc_context_free() in parallel with or after\nfastrpc_device_release() has freed the user structure, it dereferences\nthe freed fastrpc_user. Depending on the state of the context at the\ntime of the race, any one of the following accesses can be hit:\n\n 1. fastrpc_buf_free() calls fastrpc_ipa_to_dma_addr(buf->fl->cctx, ...)\n to strip the SID bits from the stored IOVA before passing the\n physical address to dma_free_coherent().\n\n 2. fastrpc_free_map() reads map->fl->cctx->vmperms[0].vmid to\n reconstruct the source permission bitmask needed for the\n qcom_scm_assign_mem() call that returns memory from the DSP VM\n back to HLOS.\n\n 3. fastrpc_free_map() acquires map->fl->lock to safely remove the\n map node from the fl->maps list.\n\nThe resulting use-after-free manifests as:\n\n pc : fastrpc_buf_free+0x38/0x80 [fastrpc]\n lr : fastrpc_context_free+0xa8/0x1b0 [fastrpc]\n fastrpc_context_free+0xa8/0x1b0 [fastrpc]\n fastrpc_context_put_wq+0x78/0xa0 [fastrpc]\n process_one_work+0x180/0x450\n worker_thread+0x26c/0x388\n\nAdd kref-based reference counting to fastrpc_user. Have each invoke\ncontext take a reference on the user at allocation time and release it\nwhen the context is freed. Release the initial reference in\nfastrpc_device_release() at file close. Move the teardown of the user\nstructure \u2014 freeing pending contexts, maps, mmaps, and the channel\ncontext reference \u2014 into the kref release callback fastrpc_user_free(),\nso that it runs only when the last reference is dropped, regardless of\nwhether that happens at device close or after the final in-flight\ncontext completes."}], "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 - The vulnerable code is reached through local FastRPC misc-device file operations and ioctls on /dev/fastrpc-* rather than by network or physical input.\nAC:L - The attacker can create in-flight DSP invokes and race close/interruption against DSP response workqueue cleanup, and the race can be retried under attacker control.\nPR:L - No in-driver capability check gates open or invoke; in plausible Qualcomm/Android deployments an unprivileged local app can reach FastRPC directly or through a HAL-provided fd.\nUI:N - Exploitation requires only attacker-controlled local ioctls, close, and timing; no separate victim action is needed.\nS:U - The memory corruption affects the kernel driver and kernel memory within the same OS security authority, with no VM or sandbox boundary escape inherent to the bug.\nC:H - This is a kernel use-after-free of fastrpc_user reachable from deferred context cleanup, and UAF conditions can be shaped into kernel memory disclosure primitives.\nI:H - The UAF can dereference attacker-reclaimed kernel heap state through buffer/map cleanup paths, making kernel memory corruption and potential control-flow or arbitrary-write exploitation defensible.\nA:H - At minimum the stale fastrpc_user dereference can crash or oops the kernel during workqueue cleanup, causing high availability impact."}]}], "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": "6cffd79504ce040f460831030d3069fa1c99bb71", "lessThan": "c6e5c2be09f814377d7f1ce97370a5b7b3e02814", "status": "affected", "versionType": "git"}, {"version": "6cffd79504ce040f460831030d3069fa1c99bb71", "lessThan": "e1e3a05efe5954d5bad01157d79429d39a67a7ae", "status": "affected", "versionType": "git"}, {"version": "6cffd79504ce040f460831030d3069fa1c99bb71", "lessThan": "d42679eef34dd590b694ce3b666c5e2ba10cd4bf", "status": "affected", "versionType": "git"}, {"version": "6cffd79504ce040f460831030d3069fa1c99bb71", "lessThan": "df08fadcf0e5f3708365ec3b6d30b5aafd98bea1", "status": "affected", "versionType": "git"}, {"version": "6cffd79504ce040f460831030d3069fa1c99bb71", "lessThan": "ecea4967c2bff92c2fafbc59893f711b39f7b152", "status": "affected", "versionType": "git"}, {"version": "6cffd79504ce040f460831030d3069fa1c99bb71", "lessThan": 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"https://git.kernel.org/stable/c/e1e3a05efe5954d5bad01157d79429d39a67a7ae"}, {"url": "https://git.kernel.org/stable/c/d42679eef34dd590b694ce3b666c5e2ba10cd4bf"}, {"url": "https://git.kernel.org/stable/c/df08fadcf0e5f3708365ec3b6d30b5aafd98bea1"}, {"url": "https://git.kernel.org/stable/c/ecea4967c2bff92c2fafbc59893f711b39f7b152"}, {"url": "https://git.kernel.org/stable/c/5278ccd357e0d7aeeb1e76c0f3e0e02894a9897c"}, {"url": "https://git.kernel.org/stable/c/fbe0947420eec18a84638d29468c2d563ce4e6a3"}, {"url": "https://git.kernel.org/stable/c/e85eb5feca8e254905ffa6c57a3c99c89a674a0f"}], "title": "misc: fastrpc: fix use-after-free of fastrpc_user in workqueue context", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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"5.15.210", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.176", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.143", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.94", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.36", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.13", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D324C6F1-A3BA-4A53-9D3F-59A846597A5E", "versionEndExcluding": "5.10.259", "versionStartIncluding": "5.1", "vulnerable": true}, {"criteria": 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"cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*", "matchCriteriaId": "B0E8FC71-3952-444C-83E9-718DBBBEC615", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc7:*:*:*:*:*:*", "matchCriteriaId": "1039E95A-8CC3-4C88-8FF9-5C08EEB861C9", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: fix use-after-free of fastrpc_user in workqueue context\n\nThere is a race between fastrpc_device_release() and the workqueue\nthat processes DSP responses. When the user closes the file descriptor,\nfastrpc_device_release() frees the fastrpc_user structure. Concurrently,\nan in-flight DSP invocation can complete and fastrpc_rpmsg_callback()\nschedules context cleanup via schedule_work(&ctx->put_work). If the\nworkqueue runs fastrpc_context_free() in parallel with or after\nfastrpc_device_release() has freed the user structure, it dereferences\nthe freed fastrpc_user. Depending on the state of the context at the\ntime of the race, any one of the following accesses can be hit:\n\n 1. fastrpc_buf_free() calls fastrpc_ipa_to_dma_addr(buf->fl->cctx, ...)\n to strip the SID bits from the stored IOVA before passing the\n physical address to dma_free_coherent().\n\n 2. fastrpc_free_map() reads map->fl->cctx->vmperms[0].vmid to\n reconstruct the source permission bitmask needed for the\n qcom_scm_assign_mem() call that returns memory from the DSP VM\n back to HLOS.\n\n 3. fastrpc_free_map() acquires map->fl->lock to safely remove the\n map node from the fl->maps list.\n\nThe resulting use-after-free manifests as:\n\n pc : fastrpc_buf_free+0x38/0x80 [fastrpc]\n lr : fastrpc_context_free+0xa8/0x1b0 [fastrpc]\n fastrpc_context_free+0xa8/0x1b0 [fastrpc]\n fastrpc_context_put_wq+0x78/0xa0 [fastrpc]\n process_one_work+0x180/0x450\n worker_thread+0x26c/0x388\n\nAdd kref-based reference counting to fastrpc_user. Have each invoke\ncontext take a reference on the user at allocation time and release it\nwhen the context is freed. Release the initial reference in\nfastrpc_device_release() at file close. Move the teardown of the user\nstructure \u2014 freeing pending contexts, maps, mmaps, and the channel\ncontext reference \u2014 into the kref release callback fastrpc_user_free(),\nso that it runs only when the last reference is dropped, regardless of\nwhether that happens at device close or after the final in-flight\ncontext completes."}], "id": "CVE-2026-53161", "lastModified": "2026-07-06T16:42:02.893", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-06-25T09:16:33.483", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5278ccd357e0d7aeeb1e76c0f3e0e02894a9897c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c6e5c2be09f814377d7f1ce97370a5b7b3e02814"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d42679eef34dd590b694ce3b666c5e2ba10cd4bf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/df08fadcf0e5f3708365ec3b6d30b5aafd98bea1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e1e3a05efe5954d5bad01157d79429d39a67a7ae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e85eb5feca8e254905ffa6c57a3c99c89a674a0f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ecea4967c2bff92c2fafbc59893f711b39f7b152"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fbe0947420eec18a84638d29468c2d563ce4e6a3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: misc: fastrpc: fix use-after-free of fastrpc_user in workqueue context", "id": "2492724", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492724"}, "csaw": false, "cwe": "CWE-366", "details": ["A flaw was found in the Linux kernel's fastrpc module. A race condition between closing a file descriptor and processing Digital Signal Processor (DSP) responses can lead to a use-after-free vulnerability. This allows a local attacker to potentially cause a system crash or, in some cases, execute arbitrary code or escalate privileges."], "name": "CVE-2026-53161", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53161\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53161\nhttps://lore.kernel.org/linux-cve-announce/2026062549-CVE-2026-53161-caac@gregkh/T"]}

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