CVE-2025-71113crypto: af_alg - zero initialize memory allocated via sock_kmalloc
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 - zero initialize memory allocated via sock_kmalloc Several crypto user API contexts and requests allocated with sock_kmalloc() were left uninitialized, relying on callers to set fields explicitly. This resulted in the use of uninitialized data in certain error paths or when new fields are added in the future. The ACVP patches also contain two user-space interface files: algif_kpp.c and algif_akcipher.c. These too rely on proper initialization of their context structures. A particular issue has been observed with the newly added 'inflight' variable introduced in af_alg_ctx by commit: 67b164a871af ("crypto: af_alg - Disallow multiple in-flight AIO requests") Because the context is not memset to zero after allocation, the inflight variable has contained garbage values. As a result, af_alg_alloc_areq() has incorrectly returned -EBUSY randomly when the garbage value was interpreted as true: https://github.com/gregkh/linux/blame/master/crypto/af_alg.c#L1209 The check directly tests ctx->inflight without explicitly comparing against true/false. Since inflight is only ever set to true or false later, an uninitialized value has triggered -EBUSY failures. Zero-initializing memory allocated with sock_kmalloc() ensures inflight and other fields start in a known state, removing random issues caused by uninitialized data.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from fe869cdb89c95d060c77eea20204d6c91f233b53 before e125c8e346e4eb7b3e854c862fcb4392bc13ddba; from fe869cdb89c95d060c77eea20204d6c91f233b53 before 543bf004e4eafbb302b1e6c78570d425d2ca13a0; from fe869cdb89c95d060c77eea20204d6c91f233b53 before f81244fd6b14fecfa93b66b6bb1d59f96554e550; from fe869cdb89c95d060c77eea20204d6c91f233b53 before 84238876e3b3b262cf62d5f4d1338e983fb27010; from fe869cdb89c95d060c77eea20204d6c91f233b53 before 5a4b65523608974a81edbe386f8a667a3e10c726; from fe869cdb89c95d060c77eea20204d6c91f233b53 before 51a5ab36084f3251ef87eda3e6a6236f6488925e; from fe869cdb89c95d060c77eea20204d6c91f233b53 before 6f6e309328d53a10c0fe1f77dec2db73373179b6 | 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 V3.1.6 | 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 V3.1.6 | 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 V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 2.6.38.1 before 5.10.248; from 5.11 before 5.15.198; from 5.16 before 6.1.160; from 6.2 before 6.6.120; from 6.7 before 6.12.64; from 6.13 before 6.18.3; 2.6.38; 6.19; and 7 more ranges | NVD |
References
- https://git.kernel.org/stable/c/e125c8e346e4eb7b3e854c862fcb4392bc13ddbapatch
- https://git.kernel.org/stable/c/543bf004e4eafbb302b1e6c78570d425d2ca13a0patch
- https://git.kernel.org/stable/c/f81244fd6b14fecfa93b66b6bb1d59f96554e550patch
- https://git.kernel.org/stable/c/84238876e3b3b262cf62d5f4d1338e983fb27010patch
- https://git.kernel.org/stable/c/5a4b65523608974a81edbe386f8a667a3e10c726patch
- https://git.kernel.org/stable/c/51a5ab36084f3251ef87eda3e6a6236f6488925epatch
- https://git.kernel.org/stable/c/6f6e309328d53a10c0fe1f77dec2db73373179b6patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.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.