{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49001", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-22T01:27:53.642Z", "datePublished": "2024-10-21T20:06:15.443Z", "dateUpdated": "2026-08-05T08:53:23.800Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:53:23.800Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: fix race when vmap stack overflow\n\nCurrently, when detecting vmap stack overflow, riscv firstly switches\nto the so called shadow stack, then use this shadow stack to call the\nget_overflow_stack() to get the overflow stack. However, there's\na race here if two or more harts use the same shadow stack at the same\ntime.\n\nTo solve this race, we introduce spin_shadow_stack atomic var, which\nwill be swap between its own address and 0 in atomic way, when the\nvar is set, it means the shadow_stack is being used; when the var\nis cleared, it means the shadow_stack isn't being used.\n\n[Palmer: Add AQ to the swap, and also some comments.]" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable path is RISC-V kernel exception entry (`handle_kernel_stack_overflow` in `entry.S`) when a hart’s kernel stack has already overflowed; it is reached only via local kernel execution on the victim host, not via network protocols or physical buses.\nAC:H - Exploitation requires two or more harts to enter the overflow handler and share the global `shadow_stack` in the same narrow window; inducing simultaneous kernel stack exhaustion is an exceptional error condition with cross-CPU timing the attacker cannot reliably force at will, unlike races built from ordinary attacker-controlled ops.\nPR:L - An unprivileged local user can drive deep kernel call chains (syscalls, nested faults, filesystem recursion) that exhaust a task’s kernel stack on a multi-hart RISC-V system; real root or init-namespace admin rights are not required, and `CONFIG_VMAP_STACK` defaults to y.\nUI:N - No separate victim action (mount, open crafted file, etc.) is required; the attacker’s own workloads on multiple CPUs are sufficient to approach the overflow path.\nS:U - Corruption and panic stay inside the host kernel’s authority (shared shadow stack / overflow handling); this is not a VM escape, IOMMU bypass, or other cross-authority boundary break.\nC:H - Concurrent harts overwrite the shared `shadow_stack` while one may still be executing `get_overflow_stack()` on it, corrupting saved frames and register state (including user-influenced syscall args)—memory corruption that can be leveraged for information disclosure.\nI:H - The same race smashes another hart’s live shadow-stack frame and can load a wrong overflow SP before writing a full `pt_regs`, yielding out-of-bounds kernel writes and potential control-flow hijack via corrupted return/stack state.\nA:H - `handle_bad_stack()` always `panic(\"Kernel stack overflow\")`, and racing on the shared shadow stack can oops or corrupt state before that panic—full kernel availability loss." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/riscv/include/asm/asm.h", "arch/riscv/kernel/entry.S", "arch/riscv/kernel/traps.c" ], "versions": [ { "version": "31da94c25aea835ceac00575a9fd206c5a833fed", "lessThan": "ac00301adb19df54f2eae1efc4bad7447c0156ce", "status": "affected", "versionType": "git" }, { "version": "31da94c25aea835ceac00575a9fd206c5a833fed", "lessThan": "879fabc5a95401d9bce357e4b1d24ae4a360a81f", "status": "affected", "versionType": "git" }, { "version": "31da94c25aea835ceac00575a9fd206c5a833fed", "lessThan": "7e1864332fbc1b993659eab7974da9fe8bf8c128", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/riscv/include/asm/asm.h", "arch/riscv/kernel/entry.S", "arch/riscv/kernel/traps.c" ], "versions": [ { "version": "5.14", "status": "affected" }, { "version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.82", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.12", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "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": "5.14", "versionEndExcluding": "5.15.82" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.0.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ac00301adb19df54f2eae1efc4bad7447c0156ce" }, { "url": "https://git.kernel.org/stable/c/879fabc5a95401d9bce357e4b1d24ae4a360a81f" }, { "url": "https://git.kernel.org/stable/c/7e1864332fbc1b993659eab7974da9fe8bf8c128" } ], "title": "riscv: fix race when vmap stack overflow", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2022-49001", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-10-22T13:15:10.722004Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:18:40.637Z" } } ] } }