CVE-2026-43292

Local denial of service via unbounded RCU section

Published May 8, 2026 · Updated May 8, 2026

Denial of service in Linux Kernel 6.9 through 6.12.74, 6.13 through 6.18.15, and 6.19 through 6.19.5 allows local users to cause RCU stalls. The kasan_release_vmalloc_node loop frees many KASAN shadow pages without yielding, while page-owner stack unwinding repeatedly enters RCU read-side sections. The condition requires CONFIG_PAGE_OWNER and a large purge list; observed effects include CPU monopolization beyond ten seconds and RCU stalls, with OOM identified as a potential consequence.

CVSS severity5.5
Medium
EPSS probability0.12%
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 Linux Kernel 6.9 through 6.12.74, 6.13 through 6.18.15, and 6.19 through 6.19.5 allows local users to cause RCU stalls. The kasan_release_vmalloc_node loop frees many KASAN shadow pages without yielding, while page-owner stack unwinding repeatedly enters RCU read-side sections. The condition requires CONFIG_PAGE_OWNER and a large purge list; observed effects include CPU monopolization beyond ten seconds and RCU stalls, with OOM identified as a potential consequence.

The record

CVE
CVE-2026-43292
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1afe45f89d54b7183768ebbbbf14238ec187ab5c
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2efa9c02c9b4c0d6866aa445f11056809b25ca28
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5747435e0fd474c24530ef1a6822f47e7d264b27
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b351fbe71091f7c8676c8ba597653d08b6719447

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1afe45f89d54b7183768ebbbbf14238ec187ab5c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2efa9c02c9b4c0d6866aa445f11056809b25ca28; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5747435e0fd474c24530ef1a6822f47e7d264b27; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b351fbe71091f7c8676c8ba597653d08b6719447

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

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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

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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