{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49950","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-06-18T10:57:27.382Z","datePublished":"2025-06-18T11:00:13.985Z","dateUpdated":"2026-08-05T08:56:51.450Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T08:56:51.450Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: fix memory corruption on open\n\nThe probe session-duplication overflow check incremented the session\ncount also when there were no more available sessions so that memory\nbeyond the fixed-size slab-allocated session array could be corrupted in\nfastrpc_session_alloc() on open()."}],"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 - Triggered by opening the local miscdevice `/dev/fastrpc-*`, which calls fastrpc_device_open → fastrpc_session_alloc; not reachable via network packets or adjacent-link protocols.\nAC:L - Once sesscount is inflated past FASTRPC_MAX_SESSIONS (realistic on Qualcomm platforms such as SC8280XP with 14 CDSP context banks, or DTs using qcom,nsessions duplication), opening the device reliably drives the out-of-bounds session array walk with no attacker-uncontrollable race.\nPR:L - fastrpc_device_open has no capability check; on the primary deployments (Android/Qualcomm devices) non-root processes in the fastrpc/system groups can open the node and hit the vulnerable path.\nUI:N - Exploitation requires only that the attacker open the fastrpc device node; no separate victim action is needed.\nS:U - Corruption is confined to kernel memory in the same host OS authority (local privilege escalation), with no VM/IOMMU boundary crossed.\nC:H - Out-of-bounds reads of adjacent channel_ctx fields (lock/idr/list pointers) and heap corruption from an OOB write can be leveraged for arbitrary kernel memory disclosure.\nI:H - Out-of-bounds write into the spinlock, idr, and users list immediately following the session array enables classic kernel heap/list corruption primitives for arbitrary write and control-flow hijacking.\nA:H - Corrupting the channel spinlock, idr, or list_head reliably causes kernel oops/panic or hangs when those structures are subsequently used."}]}],"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":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","lessThan":"f8632b8bb53ebc005d8f24a68a0c1f9678c0e908","status":"affected","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","lessThan":"5cf2a57c7a01a0d7bdecf875a63682f542891b1b","status":"affected","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","lessThan":"cf20c3533efc89578ace94fa20a9e63446223c72","status":"affected","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","lessThan":"e0578e603065f120a8759b75e0d6c216c7078a39","status":"affected","versionType":"git"},{"version":"f6f9279f2bf0e37e2f1fb119d8832b8568536a04","lessThan":"d245f43aab2b61195d8ebb64cef7b5a08c590ab4","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":"5.1","status":"affected"},{"version":"0","lessThan":"5.1","status":"unaffected","versionType":"semver"},{"version":"5.4.213","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.142","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.66","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"5.19.8","lessThanOrEqual":"5.19.*","status":"unaffected","versionType":"semver"},{"version":"6.0","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":"5.1","versionEndExcluding":"5.4.213"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"5.10.142"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"5.15.66"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"5.19.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"6.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/f8632b8bb53ebc005d8f24a68a0c1f9678c0e908"},{"url":"https://git.kernel.org/stable/c/5cf2a57c7a01a0d7bdecf875a63682f542891b1b"},{"url":"https://git.kernel.org/stable/c/cf20c3533efc89578ace94fa20a9e63446223c72"},{"url":"https://git.kernel.org/stable/c/e0578e603065f120a8759b75e0d6c216c7078a39"},{"url":"https://git.kernel.org/stable/c/d245f43aab2b61195d8ebb64cef7b5a08c590ab4"}],"title":"misc: fastrpc: fix memory corruption on open","x_generator":{"engine":"bippy-1.2.0"}}}}