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CVE-2025-40358 (GCVE-0-2025-40358)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:39 – Updated: 2026-08-05 12:09
VLAI
Title
riscv: stacktrace: Disable KASAN checks for non-current tasks
Summary
In the Linux kernel, the following vulnerability has been resolved: riscv: stacktrace: Disable KASAN checks for non-current tasks Unwinding the stack of a task other than current, KASAN would report "BUG: KASAN: out-of-bounds in walk_stackframe+0x41c/0x460" There is a same issue on x86 and has been resolved by the commit 84936118bdf3 ("x86/unwind: Disable KASAN checks for non-current tasks") The solution could be applied to RISC-V too. This patch also can solve the issue: https://seclists.org/oss-sec/2025/q4/23 [pjw@kernel.org: clean up checkpatch issues]
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5d8544e2d0075a5f3c9a2cf27152354d54360da1 , < ef4d626ac59a56f8ec5cc09c1fef26f2923eec6f (git)
Affected: 5d8544e2d0075a5f3c9a2cf27152354d54360da1 , < f34ba22989da61186f30a40b6a82e0b3337b96fc (git)
Affected: 5d8544e2d0075a5f3c9a2cf27152354d54360da1 , < 27379fcc15a10d3e3780fe79ba3fc7ed1ccd78e2 (git)
Affected: 5d8544e2d0075a5f3c9a2cf27152354d54360da1 , < 2c8d2b53866fb229b438296526ef0fa5a990e5e5 (git)
Affected: 5d8544e2d0075a5f3c9a2cf27152354d54360da1 , < 060ea84a484e852b52b938f234bf9b5503a6c910 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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              "value": "AV:L - The unwinder is reached through local interfaces only \u2014 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\u0027s 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 \u2014 hung_task\u0027s 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\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The unwinder performs an out-of-bounds read of another task\u0027s 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."
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    "cveId": "CVE-2025-40358",
    "datePublished": "2025-12-16T13:39:57.847Z",
    "dateReserved": "2025-04-16T07:20:57.187Z",
    "dateUpdated": "2026-08-05T12:09:53.455Z",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-13T17:59:54+00:00",
      "cve": "CVE-2025-40358",
      "id": "CVE-2025-40358",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel (RISC-V): Information disclosure and denial of service in stacktrace",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40358.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T00:17:16Z",
      "cve": "CVE-2025-40358",
      "id": "CVE-2025-40358",
      "initial_release_date": "2025-12-17T00:30:22Z",
      "product_status:known_not_affected": "560",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-40358",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40358.json",
      "version": "17"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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