CVE-2026-74692Network attack vector

Remote memory exhaustion via listener-close race

Published Aug 22, 2026 · Updated Aug 25, 2026

Race condition in the SMC networking subsystem in affected Linux kernel releases allows remote attackers to exhaust kernel memory. smc_listen_out() checks listener state before taking the listener lock, so concurrent close processing can drain the queue before a child is enqueued on the closed listener. Any unauthenticated network peer that reaches an AF_SMC listener can drive handshakes during routine listener shutdown; each successful race leaks a socket and references until kernel memory is exhausted.

CVSS severity7.5
High
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the SMC networking subsystem in affected Linux kernel releases allows remote attackers to exhaust kernel memory. smc_listen_out() checks listener state before taking the listener lock, so concurrent close processing can drain the queue before a child is enqueued on the closed listener. Any unauthenticated network peer that reaches an AF_SMC listener can drive handshakes during routine listener shutdown; each successful race leaks a socket and references until kernel memory is exhausted.

The record

CVE
CVE-2026-74692
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.19.299 <4.20
  2. Affected versionversion=5.1
  3. Affected versionversion=d1d004585b40c212b338fc8a40cbaaf230ea4703
  4. Affected versionversion=fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 <00f89433777236ced4771211047fb5d4cd581cea
  5. Affected versionversion=fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 <01865e1ddb126b25ac9eba5cdd7ec49e11183a64
  6. Affected versionversion=fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 <185a4caeecabc150106deda1da170b09f2ad803f
  7. Affected versionversion=fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 <53c7938d8bcfde3296ec1a347ba2a9393c1fdcfa
  8. Affected versionversion=fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 <78e5ebcd1c10ed7c8bda0a99e0abd5b62da86d67
  9. Affected versionversion=fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 <feb71634bb1abab3e8fb5cde874b27001cc1282e
  10. Affected versionversion=fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 <ff5bcd804b5bc5c64736b7d318c20e12ea9506b8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.19.299 <4.20; version=5.1; version=d1d004585b40c212b338fc8a40cbaaf230ea4703; version=fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 <00f89433777236ced4771211047fb5d4cd581cea; version=fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 <01865e1ddb126b25ac9eba5cdd7ec49e11183a64; version=fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 <185a4caeecabc150106deda1da170b09f2ad803f; version=fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 <53c7938d8bcfde3296ec1a347ba2a9393c1fdcfa; version=fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 <78e5ebcd1c10ed7c8bda0a99e0abd5b62da86d67; version=fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 <feb71634bb1abab3e8fb5cde874b27001cc1282e; version=fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 <ff5bcd804b5bc5c64736b7d318c20e12ea9506b8

Published CVSS scores

7.5LinuxCVSS:3.1/AV:N/AC:L/PR:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation Flaws

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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