Medium 5.5Published Apr 25, 2026

CVE-2026-31677crypto: af_alg - limit RX SG extraction by receive buffer budget

Updated under an hour ago (Oct 28, 2026, 2:30 PM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from e870456d8e7c8d57c059ea479b5aadbb55ff4c3a before 7e345de2e69475430af85e09210795d8eb8e719c; from e870456d8e7c8d57c059ea479b5aadbb55ff4c3a before 9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9; from e870456d8e7c8d57c059ea479b5aadbb55ff4c3a before 07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453; from e870456d8e7c8d57c059ea479b5aadbb55ff4c3a before 4a264b2614c73c96666e196bbabe0cead52bdba7; from e870456d8e7c8d57c059ea479b5aadbb55ff4c3a before 8eceab19eba9dcbfd2a0daec72e1bf48aa100170	CNA record
linux linux_kernel linux:linux_kernel	from 4.14 before 6.12.83; from 6.13 before 6.18.24; from 6.19 before 6.19.14; 7.0; 7.0; 7.0; 7.0; 7.0; and 2 more ranges	NVD

References

References

https://git.kernel.org/stable/c/7e345de2e69475430af85e09210795d8eb8e719c
https://git.kernel.org/stable/c/9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9	patch
https://git.kernel.org/stable/c/07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453	patch
https://git.kernel.org/stable/c/4a264b2614c73c96666e196bbabe0cead52bdba7	patch
https://git.kernel.org/stable/c/8eceab19eba9dcbfd2a0daec72e1bf48aa100170	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.