CVE-2025-40022crypto: af_alg - Fix incorrect boolean values in af_alg_ctx
Updated under an hour ago ()
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Deferred
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 0f28c4adbc4a97437874c9b669fd7958a8c6d6ce before 3a21698ace915a445bce2d0dcfc84b6d2199baf7; from e4c1ec11132ec466f7362a95f36a506ce4dc08c9 before d382d6daf0184490f366562469a5673f65ee2662; from 1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8 before 54506c6335690f4ef1b9f154e34f5a604c72c1ed; from 7c4491b5644e3a3708f3dbd7591be0a570135b84 before 8703940bd30b5ad94408d28d7192db2491cd3592; from 9aee87da5572b3a14075f501752e209801160d3d before 316b090c2fee964c307a634fecc7df269664b158; from 45bcf60fe49b37daab1acee57b27211ad1574042 before fbe96bd25423e61273d8831e995260b429d850b6; from 1b34cbbf4f011a121ef7b2d7d6e6920a036d5285 before d0ca0df179c4b21e2a6c4a4fb637aa8fa14575cb | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
References
- https://git.kernel.org/stable/c/3a21698ace915a445bce2d0dcfc84b6d2199baf7
- https://git.kernel.org/stable/c/d382d6daf0184490f366562469a5673f65ee2662
- https://git.kernel.org/stable/c/54506c6335690f4ef1b9f154e34f5a604c72c1ed
- https://git.kernel.org/stable/c/8703940bd30b5ad94408d28d7192db2491cd3592
- https://git.kernel.org/stable/c/316b090c2fee964c307a634fecc7df269664b158
- https://git.kernel.org/stable/c/fbe96bd25423e61273d8831e995260b429d850b6
- https://git.kernel.org/stable/c/d0ca0df179c4b21e2a6c4a4fb637aa8fa14575cb
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.