{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-48874","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-07-16T11:38:08.921Z","datePublished":"2024-08-21T06:10:05.081Z","dateUpdated":"2026-08-05T08:52:45.133Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T08:52:45.133Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: Fix use-after-free and race in fastrpc_map_find\n\nCurrently, there is a race window between the point when the mutex is\nunlocked in fastrpc_map_lookup and the reference count increasing\n(fastrpc_map_get) in fastrpc_map_find, which can also lead to\nuse-after-free.\n\nSo lets merge fastrpc_map_find into fastrpc_map_lookup which allows us\nto both protect the maps list by also taking the &fl->lock spinlock and\nthe reference count, since the spinlock will be released only after.\nAdd take_ref argument to make this suitable for all callers."}],"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 vulnerability is reached only through local ioctls on /dev/fastrpc-* misc devices (FASTRPC_IOCTL_INVOKE / MEM_MAP / MEM_UNMAP) via fastrpc_device_ioctl → fastrpc_map_create → fastrpc_map_find; it is not reachable from network packet processing.\nAC:L - The attacker controls both sides of the race by issuing concurrent ioctls from multiple threads on the same fastrpc fd (e.g. map_find via invoke/mem_map while another thread drops the last map ref via mem_unmap or put_args), so success does not depend on conditions outside attacker control.\nPR:L - fastrpc_device_open performs no capability check, and on typical Qualcomm/Android deployments unprivileged/untrusted contexts can obtain access to the non-secure fastrpc node (directly or via HAL FD passing), so real root/init-namespace privileges are not required.\nUI:N - Exploitation requires only the attacker’s own open/ioctl calls on the fastrpc device; no separate victim action is needed.\nS:U - This is a kernel heap UAF enabling privilege escalation within the same OS security authority; it does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - Use-after-free of struct fastrpc_map lets an attacker reclaim and control the freed object, enabling arbitrary kernel memory disclosure.\nI:H - The same UAF is exploitable for heap spraying and arbitrary write / control-flow hijacking in the kernel, not merely a limited corruption.\nA:H - Use-after-free of the map object can cause kernel oops/panic (and does so even when not fully exploited for code execution)."}]}],"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":"8f6c1d8c4f0cc316b0456788fff8373554d1d99d","lessThan":"a50c5c25b6e7d2824698c0e6385f882a18f4a498","status":"affected","versionType":"git"},{"version":"8f6c1d8c4f0cc316b0456788fff8373554d1d99d","lessThan":"9446fa1683a7e3937d9970248ced427c1983a1c5","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":"5.18","status":"affected"},{"version":"0","lessThan":"5.18","status":"unaffected","versionType":"semver"},{"version":"6.1.8","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.2","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":"5.18","versionEndExcluding":"6.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/a50c5c25b6e7d2824698c0e6385f882a18f4a498"},{"url":"https://git.kernel.org/stable/c/9446fa1683a7e3937d9970248ced427c1983a1c5"}],"title":"misc: fastrpc: Fix use-after-free and race in fastrpc_map_find","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2022-48874","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T16:05:19.392844Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-12T17:32:53.688Z"}}]}}