CVE-2025-39931crypto: af_alg - Set merge to zero early in af_alg_sendmsg
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Set merge to zero early in af_alg_sendmsg If an error causes af_alg_sendmsg to abort, ctx->merge may contain a garbage value from the previous loop. This may then trigger a crash on the next entry into af_alg_sendmsg when it attempts to do a merge that can't be done. Fix this by setting ctx->merge to zero near the start of the loop.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- 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
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before 28f6f37abca7c5c9eb3959c66310f1d4d98b8aaf; from 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before db2b42425dfbde4983b0c20fb7cfa05f70e6a745; from 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before 6241b9e2809b12da9130894cf5beddf088dc1b8a; from 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before 2374c11189ef704a3e4863646369f1b8e6a27d71; from 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before 24c1106504c625fabd3b7229611af617b4c27ac7; from 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before 045ee26aa3920a47ec46d7fcb302420bf01fd753; from 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 before 9574b2330dbd2b5459b74d3b5e9619d39299fc6f | 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 |
linux linux_kernel linux:linux_kernel | from 2.6.38 before 6.1.154; from 6.2 before 6.6.108; from 6.7 before 6.12.49; from 6.13 before 6.16.9; 6.17; 6.17; 6.17; 6.17; and 2 more ranges | NVD |
References
- https://git.kernel.org/stable/c/28f6f37abca7c5c9eb3959c66310f1d4d98b8aaf
- https://git.kernel.org/stable/c/db2b42425dfbde4983b0c20fb7cfa05f70e6a745
- https://git.kernel.org/stable/c/6241b9e2809b12da9130894cf5beddf088dc1b8apatch
- https://git.kernel.org/stable/c/2374c11189ef704a3e4863646369f1b8e6a27d71patch
- https://git.kernel.org/stable/c/24c1106504c625fabd3b7229611af617b4c27ac7patch
- https://git.kernel.org/stable/c/045ee26aa3920a47ec46d7fcb302420bf01fd753patch
- https://git.kernel.org/stable/c/9574b2330dbd2b5459b74d3b5e9619d39299fc6fpatch
- 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.