CVE-2025-40358Public exploit

Kernel memory read via non-current stack unwinding

Published Dec 16, 2025 · Updated Dec 16, 2025

Out-of-bounds access in affected Linux kernels allows local users to read kernel memory or interrupt service during RISC-V stack unwinding. When proc_pid_stack unwinds a non-current task, walk_stackframe applies KASAN checks to another task's stack and reports an out-of-bounds access. Reachability requires local low-privileged access, a RISC-V kernel with KASAN enabled, and a concurrent procfs stack read; public discussion disputes that this is exploitable memory corruption.

CVSS severity7.1
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in affected Linux kernels allows local users to read kernel memory or interrupt service during RISC-V stack unwinding. When proc_pid_stack unwinds a non-current task, walk_stackframe applies KASAN checks to another task's stack and reports an out-of-bounds access. Reachability requires local low-privileged access, a RISC-V kernel with KASAN enabled, and a concurrent procfs stack read; public discussion disputes that this is exploitable memory corruption.

The record

CVE
CVE-2025-40358
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.15
  2. Affected versionversion=5d8544e2d0075a5f3c9a2cf27152354d54360da1 <060ea84a484e852b52b938f234bf9b5503a6c910
  3. Affected versionversion=5d8544e2d0075a5f3c9a2cf27152354d54360da1 <27379fcc15a10d3e3780fe79ba3fc7ed1ccd78e2
  4. Affected versionversion=5d8544e2d0075a5f3c9a2cf27152354d54360da1 <2c8d2b53866fb229b438296526ef0fa5a990e5e5
  5. Affected versionversion=5d8544e2d0075a5f3c9a2cf27152354d54360da1 <f34ba22989da61186f30a40b6a82e0b3337b96fc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.15; version=5d8544e2d0075a5f3c9a2cf27152354d54360da1 <060ea84a484e852b52b938f234bf9b5503a6c910; version=5d8544e2d0075a5f3c9a2cf27152354d54360da1 <27379fcc15a10d3e3780fe79ba3fc7ed1ccd78e2; version=5d8544e2d0075a5f3c9a2cf27152354d54360da1 <2c8d2b53866fb229b438296526ef0fa5a990e5e5; version=5d8544e2d0075a5f3c9a2cf27152354d54360da1 <f34ba22989da61186f30a40b6a82e0b3337b96fc

Published CVSS scores

7.1Linux kernel.org CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

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