Linux Kernel af_alg RX SG Extraction: Buffer Budget Limitation
CVE-2026-31677 Published on April 25, 2026
crypto: af_alg - limit RX SG extraction by receive buffer budget
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.
Products Associated with CVE-2026-31677
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Affected Versions
Linux:- Version e870456d8e7c8d57c059ea479b5aadbb55ff4c3a and below 9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9 is affected.
- Version e870456d8e7c8d57c059ea479b5aadbb55ff4c3a and below 07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453 is affected.
- Version e870456d8e7c8d57c059ea479b5aadbb55ff4c3a and below 4a264b2614c73c96666e196bbabe0cead52bdba7 is affected.
- Version e870456d8e7c8d57c059ea479b5aadbb55ff4c3a and below 8eceab19eba9dcbfd2a0daec72e1bf48aa100170 is affected.
- Version 4.14 is affected.
- Before 4.14 is unaffected.
- Version 6.12.83, <= 6.12.* is unaffected.
- Version 6.18.24, <= 6.18.* is unaffected.
- Version 6.19.14, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.