CVE-2026-43248

Kernel memory corruption via off-by-one group check

Published May 6, 2026 · Updated May 6, 2026

Out-of-bounds write in Linux Kernel 5.19 through 6.12.74, 6.13 through 6.18.15, and 6.19 through 6.19.5 allows local users to corrupt memory. The vdpasim_set_group_asid path accepts group equal to ngroups because its bound check uses group > ngroups, then indexes group state beyond the allocation. Reachability requires root or membership in a privileged group with access to a /dev/vhost-vdpa-* device, which defaults to mode 0600.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Linux Kernel 5.19 through 6.12.74, 6.13 through 6.18.15, and 6.19 through 6.19.5 allows local users to corrupt memory. The vdpasim_set_group_asid path accepts group equal to ngroups because its bound check uses group > ngroups, then indexes group state beyond the allocation. Reachability requires root or membership in a privileged group with access to a /dev/vhost-vdpa-* device, which defaults to mode 0600.

The record

CVE
CVE-2026-43248
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=5.19
  2. Affected versionversion=bda324fd037a6b0d44da5699574ce741ca161bc4 <406db68f9cb976a8ddfafd631197264f2307e9c9
  3. Affected versionversion=bda324fd037a6b0d44da5699574ce741ca161bc4 <7441d35d14d9a3d66d925d90cb73c75394e6d454
  4. Affected versionversion=bda324fd037a6b0d44da5699574ce741ca161bc4 <cd025c1e876b4e262e71398236a1550486a73ede
  5. Affected versionversion=bda324fd037a6b0d44da5699574ce741ca161bc4 <ddb57354634b6ba851b79da45f1de42c646f27d0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.19; version=bda324fd037a6b0d44da5699574ce741ca161bc4 <406db68f9cb976a8ddfafd631197264f2307e9c9; version=bda324fd037a6b0d44da5699574ce741ca161bc4 <7441d35d14d9a3d66d925d90cb73c75394e6d454; version=bda324fd037a6b0d44da5699574ce741ca161bc4 <cd025c1e876b4e262e71398236a1550486a73ede; version=bda324fd037a6b0d44da5699574ce741ca161bc4 <ddb57354634b6ba851b79da45f1de42c646f27d0

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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