CVE-2026-80843Hinoki check available

Kernel memory leak via overwritten auth allocation

Published Sep 4, 2026 · Updated Sep 4, 2026

Memory leak in the Linux kernel XFRM subsystem from 2.6.33 allows attackers to leak kernel memory via unspecified vectors. When attach_auth_trunc() selects an algorithm without sadb_alg_id, xfrm_state_construct() mistakes a zero property for absence and overwrites x->aalg, losing the first allocation. The public record does not identify the required privilege or location, and it does not establish whether repeated triggering interrupts service.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Memory leak in the Linux kernel XFRM subsystem from 2.6.33 allows attackers to leak kernel memory via unspecified vectors. When attach_auth_trunc() selects an algorithm without sadb_alg_id, xfrm_state_construct() mistakes a zero property for absence and overwrites x->aalg, losing the first allocation. The public record does not identify the required privilege or location, and it does not establish whether repeated triggering interrupts service.

The record

CVE
CVE-2026-80843
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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?

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  1. Affected versionversion=2.6.33
  2. Affected versionversion=4447bb33f09444920a8f1d89e1540137429351b6 <37426395cb90ef217beec8407a14bd82153793d3
  3. Affected versionversion=4447bb33f09444920a8f1d89e1540137429351b6 <71d42da01740ec6557837bebec0bc48cfc3b4c39
  4. Affected versionversion=4447bb33f09444920a8f1d89e1540137429351b6 <958ae9f261319e1cdc44879886bcda2263258cca
  5. Affected versionversion=4447bb33f09444920a8f1d89e1540137429351b6 <ba0c110c205855b3f1e3130d8c0fdb484d704c8c
  6. Affected versionversion=4447bb33f09444920a8f1d89e1540137429351b6 <be19d20e53a239572bb2a28efcc1cd2b069b1ef9
  7. Affected versionversion=4447bb33f09444920a8f1d89e1540137429351b6 <c12cbf56320fb633484ee0ca1fb7d68d6b64b213
  8. Affected versionversion=4447bb33f09444920a8f1d89e1540137429351b6 <c8837bbe792257af547fd1c0252553ce13148795
  9. Affected versionversion=4447bb33f09444920a8f1d89e1540137429351b6 <cf67361e78dca488d6e4df8396a53e6745a3a80e
  10. Affected versionversion=4447bb33f09444920a8f1d89e1540137429351b6 <fb7f3e74789a3c89647f4eb768f6dfaf4a751e72

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.33; version=4447bb33f09444920a8f1d89e1540137429351b6 <37426395cb90ef217beec8407a14bd82153793d3; version=4447bb33f09444920a8f1d89e1540137429351b6 <71d42da01740ec6557837bebec0bc48cfc3b4c39; version=4447bb33f09444920a8f1d89e1540137429351b6 <958ae9f261319e1cdc44879886bcda2263258cca; version=4447bb33f09444920a8f1d89e1540137429351b6 <ba0c110c205855b3f1e3130d8c0fdb484d704c8c; version=4447bb33f09444920a8f1d89e1540137429351b6 <be19d20e53a239572bb2a28efcc1cd2b069b1ef9; version=4447bb33f09444920a8f1d89e1540137429351b6 <c12cbf56320fb633484ee0ca1fb7d68d6b64b213; version=4447bb33f09444920a8f1d89e1540137429351b6 <c8837bbe792257af547fd1c0252553ce13148795; version=4447bb33f09444920a8f1d89e1540137429351b6 <cf67361e78dca488d6e4df8396a53e6745a3a80e; version=4447bb33f09444920a8f1d89e1540137429351b6 <fb7f3e74789a3c89647f4eb768f6dfaf4a751e72

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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