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CVE-2025-40022— crypto: af_alg - Fix incorrect boolean values in af_alg_ctx

EPSS 0.06% · P18
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I. Basic Information for CVE-2025-40022

Vulnerability Information
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Vulnerability Title
crypto: af_alg - Fix incorrect boolean values in af_alg_ctx
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Fix incorrect boolean values in af_alg_ctx Commit 1b34cbbf4f01 ("crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg") changed some fields from bool to 1-bit bitfields of type u32. However, some assignments to these fields, specifically 'more' and 'merge', assign values greater than 1. These relied on C's implicit conversion to bool, such that zero becomes false and nonzero becomes true. With a 1-bit bitfields of type u32 instead, mod 2 of the value is taken instead, resulting in 0 being assigned in some cases when 1 was intended. Fix this by restoring the bool type.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于af_alg_ctx结构中布尔值使用不当，可能导致数据转换错误。
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
LinuxLinux 0f28c4adbc4a97437874c9b669fd7958a8c6d6ce ~ 3a21698ace915a445bce2d0dcfc84b6d2199baf7 -
LinuxLinux 6.1.154 ~ 6.1.155 -

II. Public POCs for CVE-2025-40022

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III. Intelligence Information for CVE-2025-40022

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Same Patch Batch · Linux · 2025-10-24 · 8 CVEs total

CVE-2023-53733net: sched: cls_u32: Undo tcf_bind_filter if u32_replace_hw_knode
CVE-2025-40018ipvs: Defer ip_vs_ftp unregister during netns cleanup
CVE-2025-40019crypto: essiv - Check ssize for decryption and in-place encryption
CVE-2025-40020can: peak_usb: fix shift-out-of-bounds issue
CVE-2025-40021tracing: dynevent: Add a missing lockdown check on dynevent
CVE-2025-40023drm/xe/vf: Don't expose sysfs attributes not applicable for VFs
CVE-2025-40024vhost: Take a reference on the task in struct vhost_task.

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40022

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