CVE-2025-37759

Kernel panic via missing abort request reference

Published May 1, 2025 · Updated May 11, 2026

A NULL pointer dereference in the Linux kernel ublk driver allows local users to crash the system during request recovery. During recovery reissue, ublk_abort_queue() fails to acquire a request reference before cancellation, so a zero-copy request can be freed before io_uring returns its buffer. Local access to a ublk zero-copy workload using recovery reissue is required; canceling the io_uring command can dereference invalid state and panic the kernel.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in the Linux kernel ublk driver allows local users to crash the system during request recovery. During recovery reissue, ublk_abort_queue() fails to acquire a request reference before cancellation, so a zero-copy request can be freed before io_uring returns its buffer. Local access to a ublk zero-copy workload using recovery reissue is required; canceling the io_uring command can dereference invalid state and panic the kernel.

The record

CVE
CVE-2025-37759
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record 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=6.5
  2. Affected versionversion=8284066946e6d9cc979566ce698fe24e7ca0b31e <0a21d259ca4d6310fdfcc0284ebbc000e66cbf70
  3. Affected versionversion=8284066946e6d9cc979566ce698fe24e7ca0b31e <5d34a30efac9c9c93e150130caa940c0df6053c1
  4. Affected versionversion=8284066946e6d9cc979566ce698fe24e7ca0b31e <6ee6bd5d4fce502a5b5a2ea805e9ff16e6aa890f
  5. Affected versionversion=8284066946e6d9cc979566ce698fe24e7ca0b31e <caa5c8a2358604f38bf0a4afaa5eacda13763067

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.5; version=8284066946e6d9cc979566ce698fe24e7ca0b31e <0a21d259ca4d6310fdfcc0284ebbc000e66cbf70; version=8284066946e6d9cc979566ce698fe24e7ca0b31e <5d34a30efac9c9c93e150130caa940c0df6053c1; version=8284066946e6d9cc979566ce698fe24e7ca0b31e <6ee6bd5d4fce502a5b5a2ea805e9ff16e6aa890f; version=8284066946e6d9cc979566ce698fe24e7ca0b31e <caa5c8a2358604f38bf0a4afaa5eacda13763067

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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