CVE-2026-92520

bpf: Zero queue and stack outputs on lock failure

Published Sep 17, 2026 CVSS n/a EPSS < 1% KEV · Not listed

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`e388671635acf470f0986d874389148fd234620b`	affected	< 6468e8ac026b44ae2a78114b80f9d1b9164d0f6c
`a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8`	affected	< a6090eeb289c5fa45f7b629befac2bd3c19a6dae
`a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8`	affected	< 23b4bcc79bab5285275912b94e98c286f281de75
`a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8`	affected	< 1534c4bff3aaca19c4c9a82f93e9b81f7c983de3
`a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8`	affected	< e2396b8a562073787e627a5f483f1bc5c452fa6a
`a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8`	affected	< 7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232
`40e34ea01748e5b8afdd40a172868be1e1ab0ede`	affected	—
`388c9d3eefaea99828ee5000c693128a5b41ee7c`	affected	—
`acabf5df49aa3a4f9c96200102d893351b511a88`	affected	—
`232f0ba4d69263af5912e279fcc32fef2882b1dc`	affected	—
`6.1.56`	affected	< 6.1.191
`5.4.258`	affected	< 5.5
`5.10.198`	affected	< 5.11
`5.15.134`	affected	< 5.16
`6.5.6`	affected	< 6.6

Linux

affected

Version	Status	Constraints
`6.6`	affected	—
`0`	unaffected	< 6.6
`6.1.191`	unaffected	≤ 6.1.*
`6.6.160`	unaffected	≤ 6.6.*
`6.12.114`	unaffected	≤ 6.12.*
`6.18.52`	unaffected	≤ 6.18.*
`7.2.6`	unaffected	≤ 7.2.*
`7.3`	unaffected	≤ *

No data.

Vendor Product Versions

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8,1534c4bff3aaca19c4c9a82f93e9b81f7c983de3)`	affected	code_commit	—
`[a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8,e2396b8a562073787e627a5f483f1bc5c452fa6a)`	affected	code_commit	—
`[a34a9f1a19afe9c60ca0ea61dfeee63a1c2baac8,7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232)`	affected	code_commit	—
`40e34ea01748e5b8afdd40a172868be1e1ab0ede`	affected	code_commit	—
`388c9d3eefaea99828ee5000c693128a5b41ee7c`	affected	code_commit	—
`acabf5df49aa3a4f9c96200102d893351b511a88`	affected	code_commit	—
`e388671635acf470f0986d874389148fd234620b`	affected	code_commit	—
`232f0ba4d69263af5912e279fcc32fef2882b1dc`	affected	code_commit	—
`[5.4.258,5.5)`	affected	semver	—
`[5.10.198,5.11)`	affected	semver	—
`[5.15.134,5.16)`	affected	semver	—
`[6.1.56,6.2)`	affected	semver	—
`[6.5.6,6.6)`	affected	semver	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`6.6`	affected	generic	—
`[0,6.6)`	unaffected	semver	—
`[6.18.52,6.19.0)`	unaffected	semver	—
`[7.2.6,7.3.0)`	unaffected	semver	—
`[7.3-rc1,*]`	unaffected	semver	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-4904-1	linux-6.12 security update
Ubuntu USN	USN-9019-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9020-1	Linux kernel vulnerabilities

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.179% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/1534c4bff3aaca19c4c9a82f93e9b81f7c983de3
https://git.kernel.org/stable/c/23b4bcc79bab5285275912b94e98c286f281de75
https://git.kernel.org/stable/c/6468e8ac026b44ae2a78114b80f9d1b9164d0f6c
https://git.kernel.org/stable/c/7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232
https://git.kernel.org/stable/c/a6090eeb289c5fa45f7b629befac2bd3c19a6dae
https://git.kernel.org/stable/c/e2396b8a562073787e627a5f483f1bc5c452fa6a

History

Oct 30, 2026 12:45 PM Added references View changes

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/6468e8ac026b44ae2a78114b80f9d1b9164d0f6c

Oct 21, 2026 1:15 PM Added references View changes

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/23b4bcc79bab5285275912b94e98c286f281de75 https://git.kernel.org/stable/c/a6090eeb289c5fa45f7b629befac2bd3c19a6dae

Sep 19, 2026 1:00 PM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-200 CWE-788

Sep 17, 2026 4:30 PM Description updated. Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references View changes

Type	Values Removed	Values Added
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.
Title		bpf: Zero queue and stack outputs on lock failure
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/1534c4bff3aaca19c4c9a82f93e9b81f7c983de3 https://git.kernel.org/stable/c/7ac6e1ae41a09f1dd4baeeff1d028ae49ee01232 https://git.kernel.org/stable/c/e2396b8a562073787e627a5f483f1bc5c452fa6a