Out-of-bounds Read Affecting kernel-uek-doc package, versions <0:6.12.0-200.74.27.el9uek


Severity

Recommended
0.0
high
0
10

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.02% (4th percentile)

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  • Snyk IDSNYK-ORACLE9-KERNELUEKDOC-15865983
  • published1 Apr 2026
  • disclosed4 Mar 2026

Introduced: 4 Mar 2026

CVE-2026-23235  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade Oracle:9 kernel-uek-doc to version 0:6.12.0-200.74.27.el9uek or higher.
This issue was patched in ELSA-2026-50160.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-uek-doc package and not the kernel-uek-doc package as distributed by Oracle. See How to fix? for Oracle:9 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix out-of-bounds access in sysfs attribute read/write

Some f2fs sysfs attributes suffer from out-of-bounds memory access and incorrect handling of integer values whose size is not 4 bytes.

For example: vm:# echo 65537 > /sys/fs/f2fs/vde/carve_out vm:# cat /sys/fs/f2fs/vde/carve_out 65537 vm:# echo 4294967297 > /sys/fs/f2fs/vde/atgc_age_threshold vm:# cat /sys/fs/f2fs/vde/atgc_age_threshold 1

carve_out maps to {struct f2fs_sb_info}->carve_out, which is a 8-bit integer. However, the sysfs interface allows setting it to a value larger than 255, resulting in an out-of-range update.

atgc_age_threshold maps to {struct atgc_management}->age_threshold, which is a 64-bit integer, but its sysfs interface cannot correctly set values larger than UINT_MAX.

The root causes are:

  1. __sbi_store() treats all default values as unsigned int, which prevents updating integers larger than 4 bytes and causes out-of-bounds writes for integers smaller than 4 bytes.

  2. f2fs_sbi_show() also assumes all default values are unsigned int, leading to out-of-bounds reads and incorrect access to integers larger than 4 bytes.

This patch introduces {struct f2fs_attr}->size to record the actual size of the integer associated with each sysfs attribute. With this information, sysfs read and write operations can correctly access and update values according to their real data size, avoiding memory corruption and truncation.

CVSS Base Scores

version 3.1