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CVE-2026-92520

bpf: Zero queue and stack outputs on lock failure

Products / packages Linux

Published

Share

Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 21:15:32 UTC

Severity

unknown

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

The Linux kernel has a vulnerability where BPF programs can observe uninitialized stack contents after a failed helper call due to a lock failure. The queue and stack pop/peek helpers accept an uninitialized output buffer. Affected versions include various git and semver versions.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

15 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

e388671635acf470f0986d874389148fd234620b → before 6468e8ac026b44ae2a78114b80f9d1b9164d0f6c

git versions

a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8 → before a6090eeb289c5fa45f7b629befac2bd3c19a6dae

git versions

a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8 → before 23b4bcc79bab5285275912b94e98c286f281de75

git versions

a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8 → before 1534c4bff3aaca19c4c9a82f93e9b81f7c983de3

git versions

a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8 → before e2396b8a562073787e627a5f483f1bc5c452fa6a

git versions

a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8 → before 7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232

git versions

40e34ea01748e5b8afdd40a172868be1e1ab0ede

git versions

388c9d3eefaea99828ee5000c693128a5b41ee7c

git versions

acabf5df49aa3a4f9c96200102d893351b511a88

git versions

232f0ba4d69263af5912e279fcc32fef2882b1dc

git versions

6.1.56 → before 6.1.191

semver versions

5.4.258 → before 5.5

semver versions

5.10.198 → before 5.11

semver versions

5.15.134 → before 5.16

semver versions

6.5.6 → before 6.6

semver versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

8 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

6.6

unaffected

0 → before 6.6

semver versions

6.1.191 → through 6.1.*

semver versions

6.6.160 → through 6.6.*

semver versions

6.12.114 → through 6.12.*

semver versions

6.18.52 → through 6.18.*

semver versions

7.2.6 → through 7.2.*

semver versions

7.3 → through *

original_commit_for_fix versions

unknown

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

In the Linux kernel, the following vulnerability has been resolved:

bpf: Zero queue and stack outputs on lock failure

Queue and stack pop/peek helpers accept an uninitialized output buffer because the verifier expects the helper to initialize it. The empty-map error path clears the buffer, but a failed lock acquisition returns -EBUSY without writing it.

Clear the output before returning -EBUSY so BPF programs cannot observe uninitialized stack contents after a failed helper call.

References

6 sources
git.kernel.org/stable/c/6468e8ac026b44ae2a78114b80f9d1b9164d0f6c
Source referenceLinux
git.kernel.org/stable/c/a6090eeb289c5fa45f7b629befac2bd3c19a6dae
Source referenceLinux
git.kernel.org/stable/c/23b4bcc79bab5285275912b94e98c286f281de75
Source referenceLinux
git.kernel.org/stable/c/1534c4bff3aaca19c4c9a82f93e9b81f7c983de3
Source referenceLinux
git.kernel.org/stable/c/e2396b8a562073787e627a5f483f1bc5c452fa6a
Source referenceLinux
git.kernel.org/stable/c/7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232
Source referenceLinux

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification · not supplied
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-92520

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.1.56

Before: 6.1.191

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.6

Before: 6.6.160

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.6

Before: 6.12.114

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.6

Before: 6.18.52

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.6

Before: 7.2.6

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.6

Before: 7.3

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.4.258

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.10.198

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.15.134

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.5.6

Applicability preview
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  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.1.56",
            "versionEndExcluding": "6.1.191"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.4.258"
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          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.10.198"
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          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "5.15.134"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "6.5.6"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 1
Linux

Assigning organization

2026-10-30

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.