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CVE PROGRAM SOURCE RECORDUnscored

CVE-2025-71113

crypto: af_alg - zero initialize memory allocated via sock_kmalloc

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • fe869cdb89c95d060c77eea20204d6c91f233b53 to < e125c8e346e4eb7b3e854c862fcb4392bc13ddbaaffected
  • fe869cdb89c95d060c77eea20204d6c91f233b53 to < 543bf004e4eafbb302b1e6c78570d425d2ca13a0affected
  • fe869cdb89c95d060c77eea20204d6c91f233b53 to < f81244fd6b14fecfa93b66b6bb1d59f96554e550affected
  • fe869cdb89c95d060c77eea20204d6c91f233b53 to < 84238876e3b3b262cf62d5f4d1338e983fb27010affected
  • fe869cdb89c95d060c77eea20204d6c91f233b53 to < 5a4b65523608974a81edbe386f8a667a3e10c726affected
  • fe869cdb89c95d060c77eea20204d6c91f233b53 to < 51a5ab36084f3251ef87eda3e6a6236f6488925eaffected
  • fe869cdb89c95d060c77eea20204d6c91f233b53 to < 6f6e309328d53a10c0fe1f77dec2db73373179b6affected

Linux Linux

Default version status: affected

  • 2.6.38affected
  • 0 to < 2.6.38unaffected
  • 5.10.248 to ≤ 5.10.*unaffected
  • 5.15.198 to ≤ 5.15.*unaffected
  • 6.1.160 to ≤ 6.1.*unaffected
  • 6.6.120 to ≤ 6.6.*unaffected
  • 6.12.64 to ≤ 6.12.*unaffected
  • 6.18.3 to ≤ 6.18.*unaffected
  • 6.19 to ≤ *unaffected

References