CVE-2026-53161 (GCVE-0-2026-53161)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-06-28 06:39
VLAI
Title
misc: fastrpc: fix use-after-free of fastrpc_user in workqueue context
Summary
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: fix use-after-free of fastrpc_user in workqueue context There is a race between fastrpc_device_release() and the workqueue that processes DSP responses. When the user closes the file descriptor, fastrpc_device_release() frees the fastrpc_user structure. Concurrently, an in-flight DSP invocation can complete and fastrpc_rpmsg_callback() schedules context cleanup via schedule_work(&ctx->put_work). If the workqueue runs fastrpc_context_free() in parallel with or after fastrpc_device_release() has freed the user structure, it dereferences the freed fastrpc_user. Depending on the state of the context at the time of the race, any one of the following accesses can be hit: 1. fastrpc_buf_free() calls fastrpc_ipa_to_dma_addr(buf->fl->cctx, ...) to strip the SID bits from the stored IOVA before passing the physical address to dma_free_coherent(). 2. fastrpc_free_map() reads map->fl->cctx->vmperms[0].vmid to reconstruct the source permission bitmask needed for the qcom_scm_assign_mem() call that returns memory from the DSP VM back to HLOS. 3. fastrpc_free_map() acquires map->fl->lock to safely remove the map node from the fl->maps list. The resulting use-after-free manifests as: pc : fastrpc_buf_free+0x38/0x80 [fastrpc] lr : fastrpc_context_free+0xa8/0x1b0 [fastrpc] fastrpc_context_free+0xa8/0x1b0 [fastrpc] fastrpc_context_put_wq+0x78/0xa0 [fastrpc] process_one_work+0x180/0x450 worker_thread+0x26c/0x388 Add kref-based reference counting to fastrpc_user. Have each invoke context take a reference on the user at allocation time and release it when the context is freed. Release the initial reference in fastrpc_device_release() at file close. Move the teardown of the user structure — freeing pending contexts, maps, mmaps, and the channel context reference — into the kref release callback fastrpc_user_free(), so that it runs only when the last reference is dropped, regardless of whether that happens at device close or after the final in-flight context completes.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6cffd79504ce040f460831030d3069fa1c99bb71 , < c6e5c2be09f814377d7f1ce97370a5b7b3e02814 (git)
Affected: 6cffd79504ce040f460831030d3069fa1c99bb71 , < e1e3a05efe5954d5bad01157d79429d39a67a7ae (git)
Affected: 6cffd79504ce040f460831030d3069fa1c99bb71 , < d42679eef34dd590b694ce3b666c5e2ba10cd4bf (git)
Affected: 6cffd79504ce040f460831030d3069fa1c99bb71 , < df08fadcf0e5f3708365ec3b6d30b5aafd98bea1 (git)
Affected: 6cffd79504ce040f460831030d3069fa1c99bb71 , < ecea4967c2bff92c2fafbc59893f711b39f7b152 (git)
Affected: 6cffd79504ce040f460831030d3069fa1c99bb71 , < 5278ccd357e0d7aeeb1e76c0f3e0e02894a9897c (git)
Affected: 6cffd79504ce040f460831030d3069fa1c99bb71 , < fbe0947420eec18a84638d29468c2d563ce4e6a3 (git)
Affected: 6cffd79504ce040f460831030d3069fa1c99bb71 , < e85eb5feca8e254905ffa6c57a3c99c89a674a0f (git)
Create a notification for this product.
Linux Linux Affected: 5.1
Unaffected: 0 , < 5.1 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "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(\u0026ctx-\u003eput_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-\u003efl-\u003ecctx, ...)\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-\u003efl-\u003ecctx-\u003evmperms[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-\u003efl-\u003elock to safely remove the\n    map node from the fl-\u003emaps 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."
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    "dateReserved": "2026-06-09T07:44:35.388Z",
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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-\u003efl-\u003ecctx, ...)\\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-\u003efl-\u003ecctx-\u003evmperms[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-\u003efl-\u003elock to safely remove the\\n    map node from the fl-\u003emaps 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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/misc/fastrpc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6cffd79504ce040f460831030d3069fa1c99bb71\",\"lessThan\":\"c6e5c2be09f814377d7f1ce97370a5b7b3e02814\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6cffd79504ce040f460831030d3069fa1c99bb71\",\"lessThan\":\"e1e3a05efe5954d5bad01157d79429d39a67a7ae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6cffd79504ce040f460831030d3069fa1c99bb71\",\"lessThan\":\"d42679eef34dd590b694ce3b666c5e2ba10cd4bf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6cffd79504ce040f460831030d3069fa1c99bb71\",\"lessThan\":\"df08fadcf0e5f3708365ec3b6d30b5aafd98bea1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6cffd79504ce040f460831030d3069fa1c99bb71\",\"lessThan\":\"ecea4967c2bff92c2fafbc59893f711b39f7b152\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6cffd79504ce040f460831030d3069fa1c99bb71\",\"lessThan\":\"5278ccd357e0d7aeeb1e76c0f3e0e02894a9897c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6cffd79504ce040f460831030d3069fa1c99bb71\",\"lessThan\":\"fbe0947420eec18a84638d29468c2d563ce4e6a3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6cffd79504ce040f460831030d3069fa1c99bb71\",\"lessThan\":\"e85eb5feca8e254905ffa6c57a3c99c89a674a0f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/misc/fastrpc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5278ccd357e0d7aeeb1e76c0f3e0e02894a9897c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c6e5c2be09f814377d7f1ce97370a5b7b3e02814\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d42679eef34dd590b694ce3b666c5e2ba10cd4bf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/df08fadcf0e5f3708365ec3b6d30b5aafd98bea1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e1e3a05efe5954d5bad01157d79429d39a67a7ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e85eb5feca8e254905ffa6c57a3c99c89a674a0f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ecea4967c2bff92c2fafbc59893f711b39f7b152\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fbe0947420eec18a84638d29468c2d563ce4e6a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.