CyberSecBulletin
CVE-2026-52919NVD status: Analyzed

Linux: Integer Underflow (Wrap or Wraparound)

Published Updated By the CyberSecBulletin desk

CVE-2026-52919 is a high-severity integer underflow (wrap or wraparound) vulnerability in Linux, with a CVSS 3.1 base score of 7.8 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 e75e2ab463b5b34df6b98f94d740aff327ce9f6b, abae88fa254f2981d39ac003a7b302528a22af64, c66d20a3ff095e3f000551d208ec2606616db15c 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 0.12% 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 e75e2ab463b5b34df6b98f94d740aff327ce9f6b or abae88fa254f2981d39ac003a7b302528a22af64 or c66d20a3ff095e3f000551d208ec2606616db15c or c1bac194733aabd731aafa6a01350c229e187dba, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.258 or 5.15.209 or 6.1.175 or 6.6.142, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux33a3bb4a3345bb511f9c69c913da95d4693e2a4e up to, but not including, e75e2ab463b5b34df6b98f94d740aff327ce9f6b; 33a3bb4a3345bb511f9c69c913da95d4693e2a4e up to, but not including, abae88fa254f2981d39ac003a7b302528a22af64; 33a3bb4a3345bb511f9c69c913da95d4693e2a4e up to, but not including, c66d20a3ff095e3f000551d208ec2606616db15c; 33a3bb4a3345bb511f9c69c913da95d4693e2a4e up to, but not including, c1bac194733aabd731aafa6a01350c229e187dba; 33a3bb4a3345bb511f9c69c913da95d4693e2a4e up to, but not including, 01cefc5923889e29dbb5f281c3d457714ceb9c00; 33a3bb4a3345bb511f9c69c913da95d4693e2a4e up to, but not including, 90ae3eae06b7b8ab9f6250b9497c860915b4c17b; 33a3bb4a3345bb511f9c69c913da95d4693e2a4e up to, but not including, aeae11c5dad9cd0d50723890bdd866f8e6db2e7d; 33a3bb4a3345bb511f9c69c913da95d4693e2a4e up to, but not including, 94f3b133168d1c49895e7cc6afbcf1cc0b354602; and 1 more rangese75e2ab463b5b34df6b98f94d740aff327ce9f6b, abae88fa254f2981d39ac003a7b302528a22af64, c66d20a3ff095e3f000551d208ec2606616db15c, c1bac194733aabd731aafa6a01350c229e187dba, 01cefc5923889e29dbb5f281c3d457714ceb9c00, 90ae3eae06b7b8ab9f6250b9497c860915b4c17b
LinuxLinux Kernel4.8 up to, but not including, 5.10.258; 5.11 up to, but not including, 5.15.209; 5.16 up to, but not including, 6.1.175; 6.2 up to, but not including, 6.6.142; 6.7 up to, but not including, 6.12.92; 6.13 up to, but not including, 6.18.34; 6.19 up to, but not including, 7.0.11; 7.15.10.258, 5.15.209, 6.1.175, 6.6.142, 6.12.92, 6.18.34

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
HighData or code can be modified at will.
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:H/A:H. Scored by CNA.

Official description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: fix tp_meter counter underflow during shutdown batadv_tp_sender_shutdown() unconditionally decrements the "sending" atomic counter. If multiple paths (e.g. timeout, user cancel, and normal finish) call this function, the counter can underflow to -1. Since the sender logic treats any non-zero value as "still sending", a negative value causes the sender kthread to loop indefinitely. This leads to a use-after-free when the interface is removed while the zombie thread is still active. Fix this by using atomic_xchg() to ensure the counter only transitions from 1 to 0 once. [sven: added missing change in batadv_tp_send]

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

The underlying weakness: Integer Underflow (Wrap or Wraparound)

The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

More Integer Underflow (Wrap or Wraparound) vulnerabilities (CWE-191)

Timeline

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

References

Recent Integer Underflow (Wrap or Wraparound) vulnerabilities

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