CVE-2026-53110

Kernel compromise via incorrect unsigned BPF extension

Published Jun 24, 2026 · Updated Jun 24, 2026

Incorrect value extension in the Linux Kernel s390 BPF JIT allows local users to alter kernel memory via crafted BPF programs. In arch/s390/net/bpf_jit_comp.c, the JIT sign-extends unsigned kfunc arguments and BPF program return values instead of zero-extending them, so attacker-controlled high bits cross the verifier/native ABI boundary. Reaching the flaw requires BPF-loading privileges or delegated BPF access on an affected s390 system; triggering the generated code allows kernel-memory disclosure or modification, privilege escalation, or a kernel panic.

CVSS severity7.8
High
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

Incorrect value extension in the Linux Kernel s390 BPF JIT allows local users to alter kernel memory via crafted BPF programs. In arch/s390/net/bpf_jit_comp.c, the JIT sign-extends unsigned kfunc arguments and BPF program return values instead of zero-extending them, so attacker-controlled high bits cross the verifier/native ABI boundary. Reaching the flaw requires BPF-loading privileges or delegated BPF access on an affected s390 system; triggering the generated code allows kernel-memory disclosure or modification, privilege escalation, or a kernel panic.

The record

CVE
CVE-2026-53110
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=528eb2cb87bc1353235a6384696b4849bde8b0ba <202e42e4aa890172366354b233c42c73107a3f59
  2. Affected versionversion=528eb2cb87bc1353235a6384696b4849bde8b0ba <366b0e05ee24f5ba62bdc7ec1346038258b9a797
  3. Affected versionversion=528eb2cb87bc1353235a6384696b4849bde8b0ba <44c4f999b03f55debb1a0c5ab5c1796895a1adf8
  4. Affected versionversion=528eb2cb87bc1353235a6384696b4849bde8b0ba <834918a77be51419383bf1dda9f02b81ecf26b34
  5. Affected versionversion=528eb2cb87bc1353235a6384696b4849bde8b0ba <edc90a12073b9a530064a99945c183dde120cb99
  6. Affected versionversion=6.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=528eb2cb87bc1353235a6384696b4849bde8b0ba <202e42e4aa890172366354b233c42c73107a3f59; version=528eb2cb87bc1353235a6384696b4849bde8b0ba <366b0e05ee24f5ba62bdc7ec1346038258b9a797; version=528eb2cb87bc1353235a6384696b4849bde8b0ba <44c4f999b03f55debb1a0c5ab5c1796895a1adf8; version=528eb2cb87bc1353235a6384696b4849bde8b0ba <834918a77be51419383bf1dda9f02b81ecf26b34; version=528eb2cb87bc1353235a6384696b4849bde8b0ba <edc90a12073b9a530064a99945c183dde120cb99; version=6.3

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

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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