CVE-2026-31677

Local denial of service via RX overcommit

Published Apr 25, 2026 · Updated Apr 25, 2026

Denial of service in the Linux Kernel allows local users to interrupt AF_ALG skcipher processing through crafted recvmsg calls. af_alg_get_rsgl() uses af_alg_readable() only as a gate and attaches RX scatterlist data without limiting extraction to the remaining af_alg_rcvbuf(sk) budget. A low-privileged local user must access AF_ALG skcipher sockets; insufficient RX space can make recvmsg fail and stop request processing.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux Kernel allows local users to interrupt AF_ALG skcipher processing through crafted recvmsg calls. af_alg_get_rsgl() uses af_alg_readable() only as a gate and attaches RX scatterlist data without limiting extraction to the remaining af_alg_rcvbuf(sk) budget. A low-privileged local user must access AF_ALG skcipher sockets; insufficient RX space can make recvmsg fail and stop request processing.

The record

CVE
CVE-2026-31677
Published
Apr 25, 2026
Updated
Apr 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.14
  2. Affected versionversion=e870456d8e7c8d57c059ea479b5aadbb55ff4c3a <07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453
  3. Affected versionversion=e870456d8e7c8d57c059ea479b5aadbb55ff4c3a <4a264b2614c73c96666e196bbabe0cead52bdba7
  4. Affected versionversion=e870456d8e7c8d57c059ea479b5aadbb55ff4c3a <8eceab19eba9dcbfd2a0daec72e1bf48aa100170
  5. Affected versionversion=e870456d8e7c8d57c059ea479b5aadbb55ff4c3a <9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.14; version=e870456d8e7c8d57c059ea479b5aadbb55ff4c3a <07c6f6ffe29009426f0bd4d3cfbb6308b8ea8453; version=e870456d8e7c8d57c059ea479b5aadbb55ff4c3a <4a264b2614c73c96666e196bbabe0cead52bdba7; version=e870456d8e7c8d57c059ea479b5aadbb55ff4c3a <8eceab19eba9dcbfd2a0daec72e1bf48aa100170; version=e870456d8e7c8d57c059ea479b5aadbb55ff4c3a <9bf3e6ccfdcfe56ae3190d1ae987dacf1cfef4f9

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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