264 lines
15 KiB
JSON
264 lines
15 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-2026-53161",
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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": "2026-06-09T07:44:35.388Z",
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"datePublished": "2026-06-25T08:38:42.789Z",
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"dateUpdated": "2026-08-05T12:33:36.090Z"
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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": "2026-08-05T12:33:36.090Z"
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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: 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."
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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 - 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."
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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": "6cffd79504ce040f460831030d3069fa1c99bb71",
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"lessThan": "c6e5c2be09f814377d7f1ce97370a5b7b3e02814",
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"status": "affected",
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"lessThan": "e1e3a05efe5954d5bad01157d79429d39a67a7ae",
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"status": "affected",
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"status": "affected",
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"lessThan": "5278ccd357e0d7aeeb1e76c0f3e0e02894a9897c",
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"status": "affected",
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{
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"version": "6cffd79504ce040f460831030d3069fa1c99bb71",
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"lessThan": "fbe0947420eec18a84638d29468c2d563ce4e6a3",
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"status": "affected",
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"lessThan": "e85eb5feca8e254905ffa6c57a3c99c89a674a0f",
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"status": "affected",
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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": "5.1",
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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": "5.1",
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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": "5.10.259",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.210",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.176",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.143",
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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": "6.12.94",
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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": "6.18.36",
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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": "7.0.13",
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"lessThanOrEqual": "7.0.*",
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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",
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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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"references": [
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{
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},
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{
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"url": "https://git.kernel.org/stable/c/d42679eef34dd590b694ce3b666c5e2ba10cd4bf"
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},
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{
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"url": "https://git.kernel.org/stable/c/df08fadcf0e5f3708365ec3b6d30b5aafd98bea1"
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},
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{
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"url": "https://git.kernel.org/stable/c/ecea4967c2bff92c2fafbc59893f711b39f7b152"
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},
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{
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"url": "https://git.kernel.org/stable/c/5278ccd357e0d7aeeb1e76c0f3e0e02894a9897c"
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},
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{
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"url": "https://git.kernel.org/stable/c/fbe0947420eec18a84638d29468c2d563ce4e6a3"
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},
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{
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"url": "https://git.kernel.org/stable/c/e85eb5feca8e254905ffa6c57a3c99c89a674a0f"
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}
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],
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"title": "misc: fastrpc: fix use-after-free of fastrpc_user in workqueue context",
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"x_generator": {
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}
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} |