CVE-2025-71113

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.