crypto: af_alg - zero initialize memory allocated via sock_kmalloc

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-71113
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-01-14 15:16:00 UTC
Updated2026-07-14 13:18:03 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-908

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected fe869cdb89c95d060c77eea20204d6c91f233b53 e125c8e346e4eb7b3e854c862fcb4392bc13ddba git Not specified
CNA Linux Linux affected fe869cdb89c95d060c77eea20204d6c91f233b53 543bf004e4eafbb302b1e6c78570d425d2ca13a0 git Not specified
CNA Linux Linux affected fe869cdb89c95d060c77eea20204d6c91f233b53 f81244fd6b14fecfa93b66b6bb1d59f96554e550 git Not specified
CNA Linux Linux affected fe869cdb89c95d060c77eea20204d6c91f233b53 84238876e3b3b262cf62d5f4d1338e983fb27010 git Not specified
CNA Linux Linux affected fe869cdb89c95d060c77eea20204d6c91f233b53 5a4b65523608974a81edbe386f8a667a3e10c726 git Not specified
CNA Linux Linux affected fe869cdb89c95d060c77eea20204d6c91f233b53 51a5ab36084f3251ef87eda3e6a6236f6488925e git Not specified
CNA Linux Linux affected fe869cdb89c95d060c77eea20204d6c91f233b53 6f6e309328d53a10c0fe1f77dec2db73373179b6 git Not specified
CNA Linux Linux affected 2.6.38 Not specified
CNA Linux Linux unaffected 2.6.38 semver Not specified
CNA Linux Linux unaffected 5.10.248 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.198 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.160 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.120 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.64 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.3 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e125c8e346e4eb7b3e854c862fcb4392bc13ddba 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/51a5ab36084f3251ef87eda3e6a6236f6488925e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-019113.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/543bf004e4eafbb302b1e6c78570d425d2ca13a0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5a4b65523608974a81edbe386f8a667a3e10c726 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f81244fd6b14fecfa93b66b6bb1d59f96554e550 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/84238876e3b3b262cf62d5f4d1338e983fb27010 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6f6e309328d53a10c0fe1f77dec2db73373179b6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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