{ "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" } } } }