CyberSecBulletin
CVE-2026-45935NVD status: Undergoing Analysis

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-45935 is a high-severity out-of-bounds read 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 36c03f7f177b34d51f1cf1d2304b1074607bf4b0, b271c9cb85927210b1b799e55ee7f702d12b4336, a584b9d1059b29e97e17c919274e9adfb846f2a0 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 36c03f7f177b34d51f1cf1d2304b1074607bf4b0 or b271c9cb85927210b1b799e55ee7f702d12b4336 or a584b9d1059b29e97e17c919274e9adfb846f2a0 or c065541b71b79874c83d418a9acd18ad5826339b, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.15.202 or 6.1.165 or 6.6.128 or 6.12.75, 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
LinuxLinuxb46acd6a6a627d876898e1c84d3f84902264b445 up to, but not including, 36c03f7f177b34d51f1cf1d2304b1074607bf4b0; b46acd6a6a627d876898e1c84d3f84902264b445 up to, but not including, b271c9cb85927210b1b799e55ee7f702d12b4336; b46acd6a6a627d876898e1c84d3f84902264b445 up to, but not including, a584b9d1059b29e97e17c919274e9adfb846f2a0; b46acd6a6a627d876898e1c84d3f84902264b445 up to, but not including, c065541b71b79874c83d418a9acd18ad5826339b; b46acd6a6a627d876898e1c84d3f84902264b445 up to, but not including, 78942172d5bff4d4afed8674abc09cc560ce44a0; b46acd6a6a627d876898e1c84d3f84902264b445 up to, but not including, f3b437a4c3e022a1449658ae9f3dd34859894513; b46acd6a6a627d876898e1c84d3f84902264b445 up to, but not including, b2bc7c44ed1779fc9eaab9a186db0f0d01439622; 5.1536c03f7f177b34d51f1cf1d2304b1074607bf4b0, b271c9cb85927210b1b799e55ee7f702d12b4336, a584b9d1059b29e97e17c919274e9adfb846f2a0, c065541b71b79874c83d418a9acd18ad5826339b, 78942172d5bff4d4afed8674abc09cc560ce44a0, f3b437a4c3e022a1449658ae9f3dd34859894513
LinuxLinux Kernel5.15 up to, but not including, 5.15.202; 5.16 up to, but not including, 6.1.165; 6.2 up to, but not including, 6.6.128; 6.7 up to, but not including, 6.12.75; 6.13 up to, but not including, 6.18.14; 6.19 up to, but not including, 6.19.45.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4

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: fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot In the 'DeleteIndexEntryRoot' case of the 'do_action' function, the entry size ('esize') is retrieved from the log record without adequate bounds checking. Specifically, the code calculates the end of the entry ('e2') using: e2 = Add2Ptr(e1, esize); It then calculates the size for memmove using 'PtrOffset(e2, ...)', which subtracts the end pointer from the buffer limit. If 'esize' is maliciously large, 'e2' exceeds the used buffer size. This results in a negative offset which, when cast to size_t for memmove, interprets as a massive unsigned integer, leading to a heap buffer overflow. This commit adds a check to ensure that the entry size ('esize') strictly fits within the remaining used space of the index header before performing memory operations.

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

Recent Out-of-bounds Read vulnerabilities

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