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

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Summary

CVECVE-2026-31677
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-25 09:16:01 UTC
Updated2026-05-06 21:29:38 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000180000 probability, percentile 0.046080000 (date 2026-04-27)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e870456d8e7c8d57c059ea479b5aadbb55ff4c3a 9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9 git Not specified
CNA Linux Linux affected e870456d8e7c8d57c059ea479b5aadbb55ff4c3a 07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453 git Not specified
CNA Linux Linux affected e870456d8e7c8d57c059ea479b5aadbb55ff4c3a 4a264b2614c73c96666e196bbabe0cead52bdba7 git Not specified
CNA Linux Linux affected e870456d8e7c8d57c059ea479b5aadbb55ff4c3a 8eceab19eba9dcbfd2a0daec72e1bf48aa100170 git Not specified
CNA Linux Linux affected 4.14 Not specified
CNA Linux Linux unaffected 4.14 semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8eceab19eba9dcbfd2a0daec72e1bf48aa100170 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4a264b2614c73c96666e196bbabe0cead52bdba7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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