CVE-2026-31677

In the Linux kernel, the following vulnerability has been resolved:

crypto: af_alg - limit RX SG extraction by receive buffer budget

Make af_alg_get_rsgl() limit each RX scatterlist extraction to the

remaining receive buffer budget.

af_alg_get_rsgl() currently uses af_alg_readable() only as a gate

before extracting data into the RX scatterlist. Limit each extraction

to the remaining af_alg_rcvbuf(sk) budget so that receive-side

accounting matches the amount of data attached to the request.

If skcipher cannot obtain enough RX space for at least one chunk while

more data remains to be processed, reject the recvmsg call instead of

rounding the request length down to zero.