CVE-2026-72433

Kernel stack disclosure via unchecked PVID lookup

Published Aug 15, 2026 · Updated Aug 15, 2026

Information disclosure in Linux kernel netfilter allows local users to read four bytes of kernel stack data through bridge metadata evaluation. The NFT_META_BRI_IIFPVID path ignores a nonzero br_vlan_get_pvid_rcu return and stores the uninitialized p_pvid stack value. Exploitation requires local low-privileged access and a failed bridge PVID lookup; each evaluation discloses only four stack bytes.

CVSS severity5.5
Medium
EPSS probability0.22%
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 netfilter allows local users to read four bytes of kernel stack data through bridge metadata evaluation. The NFT_META_BRI_IIFPVID path ignores a nonzero br_vlan_get_pvid_rcu return and stores the uninitialized p_pvid stack value. Exploitation requires local low-privileged access and a failed bridge PVID lookup; each evaluation discloses only four stack bytes.

The record

CVE
CVE-2026-72433
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-562
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=5.3
  2. Affected versionversion=c54c7c685494fc0f1662091d4d0c4fc26e810471 <27dd2997746d54ebc079bb13161cc1bdd401d4a6
  3. Affected versionversion=c54c7c685494fc0f1662091d4d0c4fc26e810471 <4dce8bf588a89bef99b446136d15685a837e7acf
  4. Affected versionversion=c54c7c685494fc0f1662091d4d0c4fc26e810471 <7e23965d44f06ed93fb5362fb1e321b769eecc3b
  5. Affected versionversion=c54c7c685494fc0f1662091d4d0c4fc26e810471 <92c9682b36f0c8f7a1f14d4558b72793f62e90a1
  6. Affected versionversion=c54c7c685494fc0f1662091d4d0c4fc26e810471 <a853c3769b73ceb2d2b735aff621d1d51fe0553d
  7. Affected versionversion=c54c7c685494fc0f1662091d4d0c4fc26e810471 <b1b0b9efe641afa5c2d4ba2ec77aed7b6f4bc398
  8. Affected versionversion=c54c7c685494fc0f1662091d4d0c4fc26e810471 <c37a39b963034cc2d141baf46017614cb1fc275f
  9. Affected versionversion=c54c7c685494fc0f1662091d4d0c4fc26e810471 <f73b7de5338fcca7f63ca88597a050c119501531

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=c54c7c685494fc0f1662091d4d0c4fc26e810471 <27dd2997746d54ebc079bb13161cc1bdd401d4a6; version=c54c7c685494fc0f1662091d4d0c4fc26e810471 <4dce8bf588a89bef99b446136d15685a837e7acf; version=c54c7c685494fc0f1662091d4d0c4fc26e810471 <7e23965d44f06ed93fb5362fb1e321b769eecc3b; version=c54c7c685494fc0f1662091d4d0c4fc26e810471 <92c9682b36f0c8f7a1f14d4558b72793f62e90a1; version=c54c7c685494fc0f1662091d4d0c4fc26e810471 <a853c3769b73ceb2d2b735aff621d1d51fe0553d; version=c54c7c685494fc0f1662091d4d0c4fc26e810471 <b1b0b9efe641afa5c2d4ba2ec77aed7b6f4bc398; version=c54c7c685494fc0f1662091d4d0c4fc26e810471 <c37a39b963034cc2d141baf46017614cb1fc275f; version=c54c7c685494fc0f1662091d4d0c4fc26e810471 <f73b7de5338fcca7f63ca88597a050c119501531

Published CVSS scores

5.5Red HatCVSS: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-562Return of Stack Variable Address

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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