net: fix a resource leak in copy_net_ns() error handling path (CVE-2026-90077) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-90077

net: fix a resource leak in copy_net_ns() error handling path

Answer in brief

CVE-2026-90077 records a Unknown severity vulnerability in net: fix a resource leak in copy_net_ns() error handling path. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=08027f6b790be1e444e4182fb4dc53faa6539d16 <76c847e80d2b6be047707d58e8e05eedbe2593ad \|\| >=08027f6b790be1e444e4182fb4dc53faa6539d16 <e69bde4eb566aea8fa97cbb93e0bab608964f1a5 \|\| >=08027f6b790be1e444e4182fb4dc53faa6539d16 <3220b62fbb8a55feebd2a826d5ead0f49f09ed5a	76c847e80d2b6be047707d58e8e05eedbe2593ad, e69bde4eb566aea8fa97cbb93e0bab608964f1a5, 3220b62fbb8a55feebd2a826d5ead0f49f09ed5a
Linux/Linuxgeneric	6.18	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 76c847e80d2b6be047707d58e8e05eedbe2593ad if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: net: fix a resource leak in copy_net_ns() error handling path Currently, preinit_net() does two things: (1) call ns_common_init() which might fail (2) initialize resources which does not fail However, preinit_net() is returning early when (1) fails, and copy_net_ns() is jumping to the dec_ucounts: label. As a result, resources allocated by net_alloc() are leaking. We need to call key_remove_domain() and net_passive_dec() in order to release resources allocated by net_alloc(). We cannot simply jump to the put_userns: label when preinit_net() failed, for (2) is not yet done. But we can reorder (1) and (2), for there is no dependency between (1) and (2). Therefore, this patch decouples (1) from preinit_net() and changes preinit_net() back to a void function, and calls ns_common_init() after preinit_net() succeeded. Then, we can jump to immediately after ns_common_free() of the put_userns: label.

Quoted source text, attributed separately from HOL analysis.