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Vulnerability · Published Oct 24, 2025 · Assigned by Linux

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

Unrated

In plain English

A security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS )–Not rated
Exploit odds (30 days)0.2%top 85.1% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.158-1DSA-6053-1
Debian:12linux6.1.158-1DEBIAN-CVE-2025-40022
Debian:13linux6.12.57-1DEBIAN-CVE-2025-40022
Debian:14linux6.16.10-1DEBIAN-CVE-2025-40022
Ubuntu:25.10linux6.17.0-6.6UBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-40022
Ubuntu:25.10linux-aws6.17.0-1003.3UBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-40022
Ubuntu:25.10linux-azure6.17.0-1006.6UBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-40022
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-40022
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-40022
Ubuntu:25.10linux-gcp6.17.0-1003.3UBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-40022
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-40022
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-40022
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-40022
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-40022
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2025-40022
Ubuntu:25.10linux-oracle6.17.0-1003.3UBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-40022
Ubuntu:25.10linux-raspi6.17.0-1004.4UBUNTU-CVE-2025-40022
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-40022
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-40022
Ubuntu:25.10linux-realtime6.17.0-1002.3UBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-40022
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-40022
Ubuntu:25.10linux-riscv6.17.0-6.6.1UBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-40022
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-40022

Affected products (as reported)

VendorProductVersions
Linux Linux 0f28c4adbc4a97437874c9b669fd7958a8c6d6ce – before 3a21698ace915a445bce2d0dcfc84b6d2199baf7e4c1ec11132ec466f7362a95f36a506ce4dc08c9 – before d382d6daf0184490f366562469a5673f65ee26621f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8 – before 54506c6335690f4ef1b9f154e34f5a604c72c1ed7c4491b5644e3a3708f3dbd7591be0a570135b84 – before 8703940bd30b5ad94408d28d7192db2491cd35929aee87da5572b3a14075f501752e209801160d3d – before 316b090c2fee964c307a634fecc7df269664b15845bcf60fe49b37daab1acee57b27211ad1574042 – before fbe96bd25423e61273d8831e995260b429d850b61b34cbbf4f011a121ef7b2d7d6e6920a036d5285 – before d0ca0df179c4b21e2a6c4a4fb637aa8fa14575cb
Linux Linux 6.1.154 – before 6.1.1556.6.108 – before 6.6.1096.12.49 – before 6.12.506.16.9 – before 6.16.10

References