CVE-2026-53134

Kernel stack disclosure via partially initialized nft_fib registers

Published Jun 25, 2026 · Updated Jun 25, 2026

Information disclosure in Linux Kernel nft_fib allows local users to read uninitialized kernel stack data through crafted netfilter rules. NFT_FIB_RESULT_OIFNAME declares a 16-byte destination span, but lookup-failure, RTN_LOCAL, and interface-mismatch paths clear only the first four bytes; the PRESENT check can also store one byte into an oversized span. Low-privileged local access and the ability to evaluate the crafted rule are required, and a downstream expression can expose the stale bytes to userspace without modifying kernel state.

CVSS severity5.5
Medium
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

Information disclosure in Linux Kernel nft_fib allows local users to read uninitialized kernel stack data through crafted netfilter rules. NFT_FIB_RESULT_OIFNAME declares a 16-byte destination span, but lookup-failure, RTN_LOCAL, and interface-mismatch paths clear only the first four bytes; the PRESENT check can also store one byte into an oversized span. Low-privileged local access and the ability to evaluate the crafted rule are required, and a downstream expression can expose the stale bytes to userspace without modifying kernel state.

The record

CVE
CVE-2026-53134
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=4.10
  2. Affected versionversion=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <3544210609f6d1db282bbdeca639104ef624c393
  3. Affected versionversion=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <6744e49fe51bfba26522acc2d0e9703cb41d8e50
  4. Affected versionversion=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <84d8f58cf28a0415413f43ba7148f7bacd4c1b6e
  5. Affected versionversion=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <8c84885e9790823828bb8084736ea15769b1ac16
  6. Affected versionversion=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <ab185e0c4fb82dfba6fb86f8271e06f931d9c64c
  7. Affected versionversion=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <d19ddef8c327a4773ff81f8e51027d1e0b4cf069
  8. Affected versionversion=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <eb8a8124484dbc3c2b543e207da39bbccb703d31
  9. Affected versionversion=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <eca18feed38b3377a2ec5d1f22af1170c55d0171

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.10; version=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <3544210609f6d1db282bbdeca639104ef624c393; version=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <6744e49fe51bfba26522acc2d0e9703cb41d8e50; version=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <84d8f58cf28a0415413f43ba7148f7bacd4c1b6e; version=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <8c84885e9790823828bb8084736ea15769b1ac16; version=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <ab185e0c4fb82dfba6fb86f8271e06f931d9c64c; version=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <d19ddef8c327a4773ff81f8e51027d1e0b4cf069; version=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <eb8a8124484dbc3c2b543e207da39bbccb703d31; version=f6d0cbcf09c506b9b022df8f9d7693a7cec3c732 <eca18feed38b3377a2ec5d1f22af1170c55d0171

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

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

CWE-401Missing Release of Memory after Effective Lifetime
T1005Data from Local System

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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