{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-40358", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.187Z", "datePublished": "2025-12-16T13:39:57.847Z", "dateUpdated": "2026-08-05T12:09:53.455Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:09:53.455Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: stacktrace: Disable KASAN checks for non-current tasks\n\nUnwinding the stack of a task other than current, KASAN would report\n\"BUG: KASAN: out-of-bounds in walk_stackframe+0x41c/0x460\"\n\nThere is a same issue on x86 and has been resolved by the commit\n84936118bdf3 (\"x86/unwind: Disable KASAN checks for non-current tasks\")\nThe solution could be applied to RISC-V too.\n\nThis patch also can solve the issue:\nhttps://seclists.org/oss-sec/2025/q4/23\n\n[pjw@kernel.org: clean up checkpatch issues]" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The unwinder is reached through local interfaces only — reading /proc/PID/stack, or by inducing a hung-task/OOM-reaper/workqueue-stall stack dump from a local process. No network-facing code path reaches walk_stackframe on a non-current task.\nAC:L - The attacker controls both sides of the race: one thread spins in the kernel while a sibling thread reads the stack of the still-running task, which is exactly what the published syzkaller reproducer does. No memory layout or timing condition outside the attacker's influence is needed.\nPR:L - The demonstrated /proc/PID/stack path requires CAP_SYS_ADMIN in the initial user namespace, but the same non-current unwind is reached without privileges via default-enabled paths that dump a concurrently running task — hung_task's debug_show_blocker() on a running mutex owner, the OOM reaper failure dump, and the workqueue stall watchdog. An ordinary local account suffices for those.\nUI:N - The attacker triggers the stack walk entirely from its own threads; no action by another user or administrator is required.\nS:U - The faulty read and its consequences are confined to the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The unwinder performs an out-of-bounds read of another task's live kernel stack, following an attacker-influenced frame chain to essentially arbitrary offsets within that stack, and the resulting KASAN splat plus /proc/PID/stack output disclose raw kernel stack and text addresses, defeating KASLR.\nI:N - walk_stackframe only loads values from the stack and reports them through a bounded consumer callback; there is no write of any kind, so no kernel state can be modified.\nA:H - The KASAN report goes through check_panic_on_warn(\"KASAN\") and honors kasan.fault=panic, so a repeatable attacker-triggered splat becomes a kernel panic on such configurations, and unbounded report flooding degrades the system otherwise." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/riscv/kernel/stacktrace.c" ], "versions": [ { "version": "5d8544e2d0075a5f3c9a2cf27152354d54360da1", "lessThan": "ef4d626ac59a56f8ec5cc09c1fef26f2923eec6f", "status": "affected", "versionType": "git" }, { "version": "5d8544e2d0075a5f3c9a2cf27152354d54360da1", "lessThan": "f34ba22989da61186f30a40b6a82e0b3337b96fc", "status": "affected", "versionType": "git" }, { "version": "5d8544e2d0075a5f3c9a2cf27152354d54360da1", "lessThan": "27379fcc15a10d3e3780fe79ba3fc7ed1ccd78e2", "status": "affected", "versionType": "git" }, { "version": "5d8544e2d0075a5f3c9a2cf27152354d54360da1", "lessThan": "2c8d2b53866fb229b438296526ef0fa5a990e5e5", "status": "affected", "versionType": "git" }, { "version": "5d8544e2d0075a5f3c9a2cf27152354d54360da1", "lessThan": "060ea84a484e852b52b938f234bf9b5503a6c910", "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/kernel/stacktrace.c" ], "versions": [ { "version": "4.15", "status": "affected" }, { "version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.117", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.58", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17.8", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18", "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": "4.15", "versionEndExcluding": "6.1.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.6.117" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.12.58" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.17.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.18" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ef4d626ac59a56f8ec5cc09c1fef26f2923eec6f" }, { "url": "https://git.kernel.org/stable/c/f34ba22989da61186f30a40b6a82e0b3337b96fc" }, { "url": "https://git.kernel.org/stable/c/27379fcc15a10d3e3780fe79ba3fc7ed1ccd78e2" }, { "url": "https://git.kernel.org/stable/c/2c8d2b53866fb229b438296526ef0fa5a990e5e5" }, { "url": "https://git.kernel.org/stable/c/060ea84a484e852b52b938f234bf9b5503a6c910" } ], "title": "riscv: stacktrace: Disable KASAN checks for non-current tasks", "x_generator": { "engine": "bippy-1.2.0" } } } }