CyberSecBulletin
CVE-2025-38530NVD status: Analyzed

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2025-38530 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 374d9b3eb4b08407997ef1fce96119d31e0c0bc4, 0489c30d080f07cc7f09d04de723d8c2ccdb61ef, 29ef03e5b84431171d6b77b822985b54bc44b793 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.2% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to 374d9b3eb4b08407997ef1fce96119d31e0c0bc4 or 0489c30d080f07cc7f09d04de723d8c2ccdb61ef or 29ef03e5b84431171d6b77b822985b54bc44b793 or 5bfa301e1e59a9b1a7b62a800b54852337c97416, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.4.297 or 5.10.241 or 5.15.190 or 6.1.147, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxfcdb427bc7cf5e9e5d7280cf09c08dec49b49432 up to, but not including, 374d9b3eb4b08407997ef1fce96119d31e0c0bc4; fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 up to, but not including, 0489c30d080f07cc7f09d04de723d8c2ccdb61ef; fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 up to, but not including, 29ef03e5b84431171d6b77b822985b54bc44b793; fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 up to, but not including, 5bfa301e1e59a9b1a7b62a800b54852337c97416; fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 up to, but not including, 7e470d8efd10725b189ca8951973a8425932398a; fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 up to, but not including, a27e27eee313fe1c450b6af1e80e64412546cab4; fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 up to, but not including, 16c173abee315953fd17a279352fec4a1faee862; fcdb427bc7cf5e9e5d7280cf09c08dec49b49432 up to, but not including, b14b076ce593f72585412fc7fd3747e03a5e3632; and 1 more ranges374d9b3eb4b08407997ef1fce96119d31e0c0bc4, 0489c30d080f07cc7f09d04de723d8c2ccdb61ef, 29ef03e5b84431171d6b77b822985b54bc44b793, 5bfa301e1e59a9b1a7b62a800b54852337c97416, 7e470d8efd10725b189ca8951973a8425932398a, a27e27eee313fe1c450b6af1e80e64412546cab4
LinuxLinux Kernel2.6.30 up to, but not including, 5.4.297; 5.5 up to, but not including, 5.10.241; 5.11 up to, but not including, 5.15.190; 5.16 up to, but not including, 6.1.147; 6.2 up to, but not including, 6.6.100; 6.7 up to, but not including, 6.12.40; 6.13 up to, but not including, 6.15.8; 6.165.4.297, 5.10.241, 5.15.190, 6.1.147, 6.6.100, 6.12.40
DebianDebian Linux11.0Not stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.

Official description

In the Linux kernel, the following vulnerability has been resolved: comedi: pcl812: Fix bit shift out of bounds When checking for a supported IRQ number, the following test is used: if ((1 << it->options[1]) & board->irq_bits) { However, `it->options[i]` is an unchecked `int` value from userspace, so the shift amount could be negative or out of bounds. Fix the test by requiring `it->options[1]` to be within bounds before proceeding with the original test. Valid `it->options[1]` values that select the IRQ will be in the range [1,15]. The value 0 explicitly disables the use of interrupts.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

How developers prevent this class of flaw

  • Use a language that provides appropriate memory abstractions.

More Out-of-bounds Read vulnerabilities (CWE-125)

Timeline

  1. CVE record published.
  2. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Recent Out-of-bounds Read vulnerabilities

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