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🛡️ CVE-2025-71291 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

misc: bcm_vk: Fix possible null-pointer dereferences in bcm_vk_read()

In the Linux kernel, the following vulnerability has been resolved:

misc: bcm_vk: Fix possible null-pointer dereferences in bcm_vk_read()

In the function bcm_vk_read(), the pointer entry is checked, indicating

that it can be NULL. If entry is NULL and rc is set to -EMSGSIZE, the

following code may cause null-pointer dereferences:

struct vk_msg_blk tmp_msg = entry->to_h_msg[0];

set_msg_id(&tmp_msg, entry->usr_msg_id);

tmp_msg.size = entry->to_h_blks - 1;

To prevent these possible null-pointer dereferences, copy to_h_msg,

usr_msg_id, and to_h_blks from iter into temporary variables, and return

these temporary variables to the application instead of accessing them

through a potentially NULL entry.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2025-71291 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 6.19.6)
  • linux-kernel (from 6.19 up to 6.19.6)

Timeline and source

Published on 6 May 2026 and last revised on 15 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-05-06
Updated 2026-08-20
Modified 2026-08-15

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.6
linux-kernel 6.19 6.19.6

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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