CyberSecBulletin
CVE-2026-43453NVD status: Analyzed

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-43453 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 1957e793196e7f8557374fd4eda53abcbb42e1c0, 57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e, 60c1d18781e37bfb96290b86510eb01c5fa24d75 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 0.13% 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 1957e793196e7f8557374fd4eda53abcbb42e1c0 or 57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e or 60c1d18781e37bfb96290b86510eb01c5fa24d75 or 0a55d62cdb628923d8a21724374a70c76ac7d19d, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.253 or 5.15.203 or 6.1.167 or 6.6.130, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux3c4287f62044a90e73a561aa05fc46e62da173da up to, but not including, 1957e793196e7f8557374fd4eda53abcbb42e1c0; 3c4287f62044a90e73a561aa05fc46e62da173da up to, but not including, 57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e; 3c4287f62044a90e73a561aa05fc46e62da173da up to, but not including, 60c1d18781e37bfb96290b86510eb01c5fa24d75; 3c4287f62044a90e73a561aa05fc46e62da173da up to, but not including, 0a55d62cdb628923d8a21724374a70c76ac7d19d; 3c4287f62044a90e73a561aa05fc46e62da173da up to, but not including, dfbdac719198778b581bc0dd055df2542edb8c62; 3c4287f62044a90e73a561aa05fc46e62da173da up to, but not including, e047f6fbb975f685d6c9fcef95b3b7787a79b46d; 3c4287f62044a90e73a561aa05fc46e62da173da up to, but not including, 324b749aa5b2d516ccfab933df9d3f56e7807f5f; 3c4287f62044a90e73a561aa05fc46e62da173da up to, but not including, d6d8cd2db236a9dd13dbc2d05843b3445cc964b5; and 1 more ranges1957e793196e7f8557374fd4eda53abcbb42e1c0, 57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e, 60c1d18781e37bfb96290b86510eb01c5fa24d75, 0a55d62cdb628923d8a21724374a70c76ac7d19d, dfbdac719198778b581bc0dd055df2542edb8c62, e047f6fbb975f685d6c9fcef95b3b7787a79b46d
LinuxLinux Kernel5.6 up to, but not including, 5.10.253; 5.11 up to, but not including, 5.15.203; 5.16 up to, but not including, 6.1.167; 6.2 up to, but not including, 6.6.130; 6.7 up to, but not including, 6.12.78; 6.13 up to, but not including, 6.18.19; 6.19 up to, but not including, 6.19.9; 7.05.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19

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: netfilter: nft_set_pipapo: fix stack out-of-bounds read in pipapo_drop() pipapo_drop() passes rulemap[i + 1].n to pipapo_unmap() as the to_offset argument on every iteration, including the last one where i == m->field_count - 1. This reads one element past the end of the stack-allocated rulemap array (declared as rulemap[NFT_PIPAPO_MAX_FIELDS] with NFT_PIPAPO_MAX_FIELDS == 16). Although pipapo_unmap() returns early when is_last is true without using the to_offset value, the argument is evaluated at the call site before the function body executes, making this a genuine out-of-bounds stack read confirmed by KASAN: BUG: KASAN: stack-out-of-bounds in pipapo_drop+0x50c/0x57c [nf_tables] Read of size 4 at addr ffff8000810e71a4 This frame has 1 object: [32, 160) 'rulemap' The buggy address is at offset 164 -- exactly 4 bytes past the end of the rulemap array. Pass 0 instead of rulemap[i + 1].n on the last iteration to avoid the out-of-bounds read.

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: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

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