{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-53161", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-53161", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-06-25T08:38:42.789Z", "updatedAt": "2026-08-05T12:33:36.090Z", "importedAt": "2026-10-24T01:58:20.586Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "misc: fastrpc: fix use-after-free of fastrpc_user in workqueue context", "summary": "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 — freeing pending contexts, maps, mmaps, and the channel\ncontext reference — 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.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "6cffd79504ce040f460831030d3069fa1c99bb71", "status": "affected", "versionType": "git", "lessThan": "c6e5c2be09f814377d7f1ce97370a5b7b3e02814" }, { "version": "6cffd79504ce040f460831030d3069fa1c99bb71", "status": "affected", "versionType": "git", "lessThan": "e1e3a05efe5954d5bad01157d79429d39a67a7ae" }, { "version": "6cffd79504ce040f460831030d3069fa1c99bb71", "status": "affected", "versionType": "git", "lessThan": "d42679eef34dd590b694ce3b666c5e2ba10cd4bf" }, { "version": "6cffd79504ce040f460831030d3069fa1c99bb71", "status": "affected", "versionType": "git", "lessThan": "df08fadcf0e5f3708365ec3b6d30b5aafd98bea1" }, { "version": "6cffd79504ce040f460831030d3069fa1c99bb71", "status": "affected", "versionType": "git", "lessThan": "ecea4967c2bff92c2fafbc59893f711b39f7b152" }, { "version": "6cffd79504ce040f460831030d3069fa1c99bb71", "status": "affected", "versionType": "git", "lessThan": "5278ccd357e0d7aeeb1e76c0f3e0e02894a9897c" }, { "version": "6cffd79504ce040f460831030d3069fa1c99bb71", "status": "affected", "versionType": "git", "lessThan": "fbe0947420eec18a84638d29468c2d563ce4e6a3" }, { "version": "6cffd79504ce040f460831030d3069fa1c99bb71", "status": "affected", "versionType": "git", "lessThan": "e85eb5feca8e254905ffa6c57a3c99c89a674a0f" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.1", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.1" }, { "version": "5.10.259", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.210", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.176", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.143", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.94", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.36", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.0.13", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.0.*" }, { "version": "7.1", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }