CVE-2026-43093

Kernel memory corruption via undersized AF_XDP frames

Published May 6, 2026 · Updated May 6, 2026

Memory corruption in the Linux Kernel AF_XDP subsystem allows local users to corrupt kernel memory through crafted UMEM registration settings. xdp_umem_reg() validates headroom without reserving the 128-byte minimum frame space and prospective multi-buffer tailroom, so received data can overwrite skb_shared_info at the end of an XSK frame. Low-privileged local access is required; a reachable AF_XDP configuration exposes kernel memory corruption that can compromise confidentiality, integrity, and availability.

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

Memory corruption in the Linux Kernel AF_XDP subsystem allows local users to corrupt kernel memory through crafted UMEM registration settings. xdp_umem_reg() validates headroom without reserving the 128-byte minimum frame space and prospective multi-buffer tailroom, so received data can overwrite skb_shared_info at the end of an XSK frame. Low-privileged local access is required; a reachable AF_XDP configuration exposes kernel memory corruption that can compromise confidentiality, integrity, and availability.

The record

CVE
CVE-2026-43093
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
Unavailable

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=25c9cdef57488578da21d99eb614b97ffcf6e59f
  2. Affected versionversion=5.7
  3. Affected versionversion=98d3c852e63b49129515dd18c875999efaf8530a
  4. Affected versionversion=99e3a236dd43d06c65af0a2ef9cb44306aef6e02 <0ec4d3f6e6934deb843b561ae048cd17218e5ad1
  5. Affected versionversion=99e3a236dd43d06c65af0a2ef9cb44306aef6e02 <6523bc1b40e69301f24c14338b762af4739d6d39
  6. Affected versionversion=99e3a236dd43d06c65af0a2ef9cb44306aef6e02 <9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12
  7. Affected versionversion=99e3a236dd43d06c65af0a2ef9cb44306aef6e02 <a03975beb9f6af0d8ac051e30b2abeabe618414f
  8. Affected versionversion=99e3a236dd43d06c65af0a2ef9cb44306aef6e02 <a315e022a72d95ef5f1d4e58e903cb492b0ad931
  9. Affected versionversion=ad8fb61c184fe0f8d1e0b5b954d010fb9f94a6ee

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=25c9cdef57488578da21d99eb614b97ffcf6e59f; version=5.7; version=98d3c852e63b49129515dd18c875999efaf8530a; version=99e3a236dd43d06c65af0a2ef9cb44306aef6e02 <0ec4d3f6e6934deb843b561ae048cd17218e5ad1; version=99e3a236dd43d06c65af0a2ef9cb44306aef6e02 <6523bc1b40e69301f24c14338b762af4739d6d39; version=99e3a236dd43d06c65af0a2ef9cb44306aef6e02 <9ea6ba4f3195dcba6e8b3e7b2e748593b7cafb12; version=99e3a236dd43d06c65af0a2ef9cb44306aef6e02 <a03975beb9f6af0d8ac051e30b2abeabe618414f; version=99e3a236dd43d06c65af0a2ef9cb44306aef6e02 <a315e022a72d95ef5f1d4e58e903cb492b0ad931; version=ad8fb61c184fe0f8d1e0b5b954d010fb9f94a6ee

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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