CyberSecBulletin
CVE-2026-46062NVD status: Analyzed

Linux: Integer Overflow or Wraparound

Published Updated By the CyberSecBulletin desk

CVE-2026-46062 is a high-severity integer overflow 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 unauthenticated attacker, but only if a user takes part, for example by opening a link or file. The record lists versions 424858f9a048057bb8f834bfe03d18f5e477e747, e73cd5aed6b15e55c1c47577bdb473b5e88d6a69, a954061b334ec67c79ae9d0cadd83fa521396487 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 0.14% 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 424858f9a048057bb8f834bfe03d18f5e477e747 or e73cd5aed6b15e55c1c47577bdb473b5e88d6a69 or a954061b334ec67c79ae9d0cadd83fa521396487 or 60dab3e2931f3d792438a77a6cb0cb731c43300b, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.15.209 or 6.1.175 or 6.6.140 or 6.12.86, whichever matches your release line, or a later version.
  3. Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux82cae269cfa953032fbb8980a7d554d60fb00b17 up to, but not including, 424858f9a048057bb8f834bfe03d18f5e477e747; 82cae269cfa953032fbb8980a7d554d60fb00b17 up to, but not including, e73cd5aed6b15e55c1c47577bdb473b5e88d6a69; 82cae269cfa953032fbb8980a7d554d60fb00b17 up to, but not including, a954061b334ec67c79ae9d0cadd83fa521396487; 82cae269cfa953032fbb8980a7d554d60fb00b17 up to, but not including, 60dab3e2931f3d792438a77a6cb0cb731c43300b; 82cae269cfa953032fbb8980a7d554d60fb00b17 up to, but not including, f1af27cec07a9fd0847166bdb23c99e86b05bfdc; 82cae269cfa953032fbb8980a7d554d60fb00b17 up to, but not including, 6175d09c23bec4b60860ee9a0170308ff4b56e10; 82cae269cfa953032fbb8980a7d554d60fb00b17 up to, but not including, 984a415f019536ea2d24de9010744e5302a9a948; 5.15424858f9a048057bb8f834bfe03d18f5e477e747, e73cd5aed6b15e55c1c47577bdb473b5e88d6a69, a954061b334ec67c79ae9d0cadd83fa521396487, 60dab3e2931f3d792438a77a6cb0cb731c43300b, f1af27cec07a9fd0847166bdb23c99e86b05bfdc, 6175d09c23bec4b60860ee9a0170308ff4b56e10
LinuxLinux Kernel5.15 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, 6.6.140; 6.7 up to, but not including, 6.12.86; 6.13 up to, but not including, 6.18.27; 6.19 up to, but not including, 7.0.45.15.209, 6.1.175, 6.6.140, 6.12.86, 6.18.27, 7.0.4

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
NoneNo account or login is needed.
User interaction
RequiredA user must take an action such as opening a file or link.
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:N/UI:R/S:U/C:H/I:H/A:H. Scored by CNA.

Official description

In the Linux kernel, the following vulnerability has been resolved: ntfs3: fix integer overflow in run_unpack() volume boundary check The volume boundary check `lcn + len > sbi->used.bitmap.nbits` uses raw addition which can wrap around for large lcn and len values, bypassing the validation. Use check_add_overflow() as is already done for the adjacent prev_lcn + dlcn and vcn64 + len checks added by commit 3ac37e100385 ("ntfs3: Fix integer overflow in run_unpack()"). Found by fuzzing with a source-patched harness (LibAFL + QEMU).

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

The underlying weakness: Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

How developers prevent this class of flaw

  • Ensure that all protocols are strictly defined, such that all out-of-bounds behavior can be identified simply, and require strict conformance to the protocol.
  • Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. If possible, choose a language or compiler that performs automatic bounds checking.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. Use libraries or frameworks that make it easier to handle numbers without unexpected consequences. Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++).

More Integer Overflow or Wraparound vulnerabilities (CWE-190)

Timeline

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

References

Recent Integer Overflow or Wraparound vulnerabilities

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