CyberSecBulletin
CVE-2026-46190NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-46190 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 231b8e1f604f6e0a7e100536f506cdf482e2c5f5, 9a80c458320e0514e11945402dd6e48fcee05524, ca18c180b053f6ce80394322b314ac721c316af7 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 231b8e1f604f6e0a7e100536f506cdf482e2c5f5 or 9a80c458320e0514e11945402dd6e48fcee05524 or ca18c180b053f6ce80394322b314ac721c316af7 or 34bdcfb496b29f9a52431194f94473b37fb8c162, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 6.6.140 or 6.12.88 or 6.18.30 or 7.0.7, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux0257be79fc4a16a3252ce80aa13b3640f728c425 up to, but not including, 231b8e1f604f6e0a7e100536f506cdf482e2c5f5; 0257be79fc4a16a3252ce80aa13b3640f728c425 up to, but not including, 9a80c458320e0514e11945402dd6e48fcee05524; 0257be79fc4a16a3252ce80aa13b3640f728c425 up to, but not including, ca18c180b053f6ce80394322b314ac721c316af7; 0257be79fc4a16a3252ce80aa13b3640f728c425 up to, but not including, 34bdcfb496b29f9a52431194f94473b37fb8c162; 0257be79fc4a16a3252ce80aa13b3640f728c425 up to, but not including, c0b654bc0b76a1da102d9138be1ed1223bd99310; 0257be79fc4a16a3252ce80aa13b3640f728c425 up to, but not including, e47029b977e747cb3a9174308fd55762cce70147; 5.19231b8e1f604f6e0a7e100536f506cdf482e2c5f5, 9a80c458320e0514e11945402dd6e48fcee05524, ca18c180b053f6ce80394322b314ac721c316af7, 34bdcfb496b29f9a52431194f94473b37fb8c162, c0b654bc0b76a1da102d9138be1ed1223bd99310, e47029b977e747cb3a9174308fd55762cce70147
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystemall versionsNot stated
LinuxLinux Kernel5.19 up to, but not including, 6.6.140; 6.7 up to, but not including, 6.12.88; 6.13 up to, but not including, 6.18.30; 6.19 up to, but not including, 7.0.7; 7.16.6.140, 6.12.88, 6.18.30, 7.0.7

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 CNA.

Official description

In the Linux kernel, the following vulnerability has been resolved: mtd: spi-nor: debugfs: fix out-of-bounds read in spi_nor_params_show() Sashiko noticed an out-of-bounds read [1]. In spi_nor_params_show(), the snor_f_names array is passed to spi_nor_print_flags() using sizeof(snor_f_names). Since snor_f_names is an array of pointers, sizeof() returns the total number of bytes occupied by the pointers (element_count * sizeof(void *)) rather than the element count itself. On 64-bit systems, this makes the passed length 8x larger than intended. Inside spi_nor_print_flags(), the 'names_len' argument is used to bounds-check the 'names' array access. An out-of-bounds read occurs if a flag bit is set that exceeds the array's actual element count but is within the inflated byte-size count. Correct this by using ARRAY_SIZE() to pass the actual number of string pointers in the array.

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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