CVE-2026-23235

Advisory lineage Upstream: 0 Downstream: 9
Analyzed
Published: 04 Mar 2026, 14:36
Last modified:11 May 2026, 22:02

Vulnerability Summary

Overall Risk (default)
medium
28/100
CVSS Score
7.1 HIGH
v3.1 (nvd)
EPSS Score
0.02% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

04 Mar 2026, 14:36
Published
Vulnerability first disclosed
11 May 2026, 22:02
Last Modified
Vulnerability information updated

Description

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 Metrics

  • v3.1•HIGH•Score: 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS Trends

Current EPSS score: 0.02%• Percentile: 6%

Techniques & Countermeasures

  • CWE-125•Out-of-bounds Read

    The product reads data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • linux•linux

    ≥ b59d0bae6ca30c496f298881616258f9cde0d9c6, < e85a99db9ab85dfc30d93b0ca0e9156f3127f55a | ≥ b59d0bae6ca30c496f298881616258f9cde0d9c6, < 438a405fbad6882df0e34b3e1a16839a71f04240 | ≥ b59d0bae6ca30c496f298881616258f9cde0d9c6, < 6a6c07a9b49e43f0df42d7118fc76aa555c73d98 | ≥ b59d0bae6ca30c496f298881616258f9cde0d9c6, < eebd72cff518ac87e660aefb8a41224bd88c32ce | ≥ b59d0bae6ca30c496f298881616258f9cde0d9c6, < 4ef30b9f1641c9e877792df6b049f1cf507d002d | ≥ b59d0bae6ca30c496f298881616258f9cde0d9c6, < d4a594dd952df123cbdcdee9b9640d9d55e4a954 | ≥ b59d0bae6ca30c496f298881616258f9cde0d9c6, < 3a905e183c047577b154f08a78ac3039e9454703 | ≥ b59d0bae6ca30c496f298881616258f9cde0d9c6, < 98ea0039dbfdd00e5cc1b9a8afa40434476c0955 | 3.12

  • linux•linux_kernel

    ≥ 3.12, < 5.10.251 | ≥ 5.11, < 5.15.201 | ≥ 5.16, < 6.1.164 | ≥ 6.2, < 6.6.127 | ≥ 6.7, < 6.12.74 | ≥ 6.13, < 6.18.13 | ≥ 6.19, < 6.19.3

References (8)