Skip to content
Noroxi
NVD / CVE Program· CNA Linux

CVE-2026-90393: bpf: Fix potential UAF in bpf_netns_link_update_prog

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.23% (FIRST EPSS).
  • Fixed version: Linux Linux 277168cb9d153ce8e9c3f9275670e32ae61b41d6, 5c5997836381010fc5907b36bc17d3b19407e933, 79a66fd997d4eecf17302d613194879eb32e0986.

Low priority for now. Upgrade to Linux Linux 277168cb9d153ce8e9c3f9275670e32ae61b41d6, 5c5997836381010fc5907b36bc17d3b19407e933, 79a66fd997d4eecf17302d613194879eb32e0986 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix potential UAF in bpf_netns_link_update_prog In bpf_netns_link_update_prog, the checks for old_prog and prog type are currently performed locklessly before acquiring netns_bpf_mutex. This creates a race condition that can lead to a UAF issue. If two threads concurrently execute BPF_LINK_UPDATE on the same netns link, the following execution path can trigger a UAF: CPU0 CPU1 bpf_netns_link_update_prog if (old_prog && old_prog != link->prog) return -EPERM; bpf_netns_link_update_prog if (old_prog && old_prog != link->prog) ... old_prog = xchg(&link->prog, new_prog); bpf_prog_put(old_prog); if (new_prog->type != link->prog->type) <-- trigger UAF Fix this by moving the old_prog and prog->type checks inside the netns_bpf_mutex critical section. Meanwhile, use guard() to simplify lock management and avoid all the goto jumping.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 14th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-90393

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.8affected
    • 7f045a49fee04b5662cbdeaf0838f9322ae8c63a and later · before d462b5481d77ce7df8a5ff89a699386f00c9214daffected · git
    • 7f045a49fee04b5662cbdeaf0838f9322ae8c63a and later · before bdddf3e1493ee973619c154a57071ce67f78598baffected · git
    • 7f045a49fee04b5662cbdeaf0838f9322ae8c63a and later · before 79a66fd997d4eecf17302d613194879eb32e0986affected · git
    • 7f045a49fee04b5662cbdeaf0838f9322ae8c63a and later · before f4ce6803df4095777191d800bebc50219b615ca0affected · git
    • 7f045a49fee04b5662cbdeaf0838f9322ae8c63a and later · before 277168cb9d153ce8e9c3f9275670e32ae61b41d6affected · git
    • 7f045a49fee04b5662cbdeaf0838f9322ae8c63a and later · before bda86e9f31b9a296b6e64a51c91dc776fc9f613eaffected · git
    • 7f045a49fee04b5662cbdeaf0838f9322ae8c63a and later · before 923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7affected · git
    • 7f045a49fee04b5662cbdeaf0838f9322ae8c63a and later · before 5c5997836381010fc5907b36bc17d3b19407e933affected · git
    • before 5.8not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-90391Sep 17, 2026 · lib/test_hmm: fail dmirror_fault() when the mirrored mm is gone
    0Monitor
  • ← EarlierCVE-2026-90392Sep 17, 2026 · bpf: Fix potential UAF when reading bpf link info
    31Monitor
  • Later →CVE-2026-90394Sep 17, 2026 · power: supply: sc2731_charger: cancel work on remove
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux277168cb9d153ce8e9c3f9275670e32ae61b41d6Vendor (CNA)
Linux Linux5c5997836381010fc5907b36bc17d3b19407e933Vendor (CNA)
Linux Linux79a66fd997d4eecf17302d613194879eb32e0986Vendor (CNA)
Linux Linux923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7Vendor (CNA)
Linux Linuxbda86e9f31b9a296b6e64a51c91dc776fc9f613eVendor (CNA)
Linux Linuxbdddf3e1493ee973619c154a57071ce67f78598bVendor (CNA)
Linux Linuxd462b5481d77ce7df8a5ff89a699386f00c9214dVendor (CNA)
Linux Linuxf4ce6803df4095777191d800bebc50219b615ca0Vendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records