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CVE-2026-55392— NILFS utilities - Undefined Behavior and Out-of-Memory via Unvalidated s_log_block_size

CVSS 5.5 · Medium EPSS 0.15% · P5

Possible ATT&CK Techniques 1AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProductVersion RangeStatus
nilfs-devnilfs-utils≤ 2.3.0affected
26efb5daff0757365101035145331b0a5a85d9d9unaffected
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I. Basic Information for CVE-2026-55392

Vulnerability Information
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Vulnerability Title
NILFS utilities - Undefined Behavior and Out-of-Memory via Unvalidated s_log_block_size
Source: CVE Program / CVE List V5
Vulnerability Description
NILFS utilities through 2.3.0, fixed in commit 26efb5d, nilfs_sb_is_valid() function fails to validate s_log_block_size field in NILFS2 superblock before bit-shift operations. Attackers supplying crafted NILFS2 images trigger undefined behavior through oversized shifts or out-of-memory conditions, crashing tools like nilfs-tune and dumpseg.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
Source: CVE Program / CVE List V5
Vulnerability Title
nilfs-dev nilfs-utils 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nilfs-dev nilfs-utils是nilfs-dev组织的一款一套日志文件系统工具集。 nilfs-dev nilfs-utils 2.3.0及之前版本存在输入验证错误漏洞，该漏洞源于nilfs_sb_is_valid()函数在进行位移操作前未能验证s_log_block_size字段，可能导致攻击者提供特制的NILFS2镜像触发未定义行为，导致工具崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
nilfs-devnilfs-utils 0 ~ 2.3.0 -

II. Public POCs for CVE-2026-55392

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III. Intelligence Information for CVE-2026-55392

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Patches & Fixes for CVE-2026-55392 (1)

Security Blog Posts for CVE-2026-55392 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1284

V. Comments for CVE-2026-55392

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