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NVD / CVE Program· CNA Linux

CVE-2026-98015: net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put

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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 18b2969073879b9cce24e1a78b118bdad54518d1, 304ea40ef4561671503c36e47da44a0a31b71e36, 7ee07f601f8f507c9faf25c68a49396ab8950596; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 18b2969073879b9cce24e1a78b118bdad54518d1, 304ea40ef4561671503c36e47da44a0a31b71e36, 7ee07f601f8f507c9faf25c68a49396ab8950596; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put In mlx5_eswitch_termtbl_put(), the zero-ref cleanup check reads tt->ref_count after termtbl_mutex has been released. Two concurrent callers on the same mlx5_termtbl_handle race: one decrements ref_count to zero, removes the hash entry, and calls kfree(tt) while the other has already dropped the mutex and is about to evaluate if (!tt->ref_count), producing a use-after-free. Fix this by capturing the result of the decrement into a stack-local last variable before dropping the mutex. The cleanup decision is now made entirely under termtbl_mutex, and tt is not touched after kfree.

—No exploit Fix available
Published
Sep 25, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 7th 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 · 0.1%

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  • A fix has been released

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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.

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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

    • 5.3affected
    • 10caabdaad5ace85577a453da97d1f8d3b944427 and later · before e3ee194a790896fa92fea20b5385a354be2f2c12affected · git
    • 10caabdaad5ace85577a453da97d1f8d3b944427 and later · before b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797affected · git
    • 10caabdaad5ace85577a453da97d1f8d3b944427 and later · before 92f581cac93a71723456ac79ef54d9f60a251b42affected · git
    • 10caabdaad5ace85577a453da97d1f8d3b944427 and later · before a5833fdf53350b8b95a558fcf0056ddb1c0fe154affected · git
    • 10caabdaad5ace85577a453da97d1f8d3b944427 and later · before 304ea40ef4561671503c36e47da44a0a31b71e36affected · git
    • 10caabdaad5ace85577a453da97d1f8d3b944427 and later · before e393789e92310d7c66f57c876101779c90816a12affected · git
    • 10caabdaad5ace85577a453da97d1f8d3b944427 and later · before 18b2969073879b9cce24e1a78b118bdad54518d1affected · git
    • 10caabdaad5ace85577a453da97d1f8d3b944427 and later · before 7ee07f601f8f507c9faf25c68a49396ab8950596affected · git
    • before 5.3not 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 7.2.7-17.2.7-1

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-2026-98013Sep 25, 2026 · net/sched: fq_pie: clamp quantum in change path
    0Monitor
  • ← EarlierCVE-2026-98014Sep 25, 2026 · net/mlx5: E-Switch, prevent mc_list repopulation during vport disable
    0Monitor
  • Later →CVE-2026-98016Sep 25, 2026 · net/mlx5e: Fix use-after-free race in sample_restore_put()
    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 Linux18b2969073879b9cce24e1a78b118bdad54518d1Vendor (CNA)
Linux Linux304ea40ef4561671503c36e47da44a0a31b71e36Vendor (CNA)
Linux Linux7ee07f601f8f507c9faf25c68a49396ab8950596Vendor (CNA)
Linux Linux92f581cac93a71723456ac79ef54d9f60a251b42Vendor (CNA)
Linux Linuxa5833fdf53350b8b95a558fcf0056ddb1c0fe154Vendor (CNA)
Linux Linuxb1398c9dfb5d3d4faaf6905ff7d98110a5d2c797Vendor (CNA)
Linux Linuxe393789e92310d7c66f57c876101779c90816a12Vendor (CNA)
Linux Linuxe3ee194a790896fa92fea20b5385a354be2f2c12Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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