CyberSecBulletin
CVE-2026-23180NVD status: Deferred

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-23180 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.0 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 77611cab5bdfff7a070ae574bbfba20a1de99d1b, 34b56c16efd61325d80bf1d780d0e176be662f59, f89e33c9c37f0001b730e23b3b05ab7b1ecface2 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 0.15% 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 77611cab5bdfff7a070ae574bbfba20a1de99d1b or 34b56c16efd61325d80bf1d780d0e176be662f59 or f89e33c9c37f0001b730e23b3b05ab7b1ecface2 or 2447edc367800ba914acf7ddd5d250416b45fb31, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux24ab724f8a4661b2dc8e696b41df93bdc108f7a1 up to, but not including, 77611cab5bdfff7a070ae574bbfba20a1de99d1b; 24ab724f8a4661b2dc8e696b41df93bdc108f7a1 up to, but not including, 34b56c16efd61325d80bf1d780d0e176be662f59; 24ab724f8a4661b2dc8e696b41df93bdc108f7a1 up to, but not including, f89e33c9c37f0001b730e23b3b05ab7b1ecface2; 24ab724f8a4661b2dc8e696b41df93bdc108f7a1 up to, but not including, 2447edc367800ba914acf7ddd5d250416b45fb31; 24ab724f8a4661b2dc8e696b41df93bdc108f7a1 up to, but not including, 1b381a638e1851d8cfdfe08ed9cdbec5295b18c9; 24ab724f8a4661b2dc8e696b41df93bdc108f7a1 up to, but not including, 31a7a0bbeb006bac2d9c81a2874825025214b6d8; 5.1577611cab5bdfff7a070ae574bbfba20a1de99d1b, 34b56c16efd61325d80bf1d780d0e176be662f59, f89e33c9c37f0001b730e23b3b05ab7b1ecface2, 2447edc367800ba914acf7ddd5d250416b45fb31, 1b381a638e1851d8cfdfe08ed9cdbec5295b18c9, 31a7a0bbeb006bac2d9c81a2874825025214b6d8

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
HighSuccess depends on conditions outside the attacker's control.
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
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

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

Official description

In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: add bounds check for if_id in IRQ handler The IRQ handler extracts if_id from the upper 16 bits of the hardware status register and uses it to index into ethsw->ports[] without validation. Since if_id can be any 16-bit value (0-65535) but the ports array is only allocated with sw_attr.num_ifs elements, this can lead to an out-of-bounds read potentially. Add a bounds check before accessing the array, consistent with the existing validation in dpaa2_switch_rx().

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. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

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