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

Received
AliasesUBUNTU-CVE-2026-98015DEBIAN-CVE-2026-98015
Published 25-09-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-98015 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.2% of scored vulnerabilities.

Priority
Insufficient evidence

No CVSS vector published; no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 17 · Related 15
MGASA-2026-0506MGASA-2026-0542OPENSUSE-SU-2026:12074-1OPENSUSE-SU-2026:22167-1SUSE-SU-2026:24371-1SUSE-SU-2026:24379-1

Timeline

  1. 25-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.18% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: not stated in public data.

Ubuntu165 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.111-1 | < 7.2.7-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ 10caabdaad5ace85577a453da97d1f8d3b944427, < e3ee194a790896fa92fea20b5385a354be2f2c12 | ≥ 10caabdaad5ace85577a453da97d1f8d3b944427, < b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797 | ≥ 10caabdaad5ace85577a453da97d1f8d3b944427, < 92f581cac93a71723456ac79ef54d9f60a251b42 | ≥ 10caabdaad5ace85577a453da97d1f8d3b944427, < a5833fdf53350b8b95a558fcf0056ddb1c0fe154 | ≥ 10caabdaad5ace85577a453da97d1f8d3b944427, < 304ea40ef4561671503c36e47da44a0a31b71e36 | ≥ 10caabdaad5ace85577a453da97d1f8d3b944427, < e393789e92310d7c66f57c876101779c90816a12 | ≥ 10caabdaad5ace85577a453da97d1f8d3b944427, < 18b2969073879b9cce24e1a78b118bdad54518d1 | ≥ 10caabdaad5ace85577a453da97d1f8d3b944427, < 7ee07f601f8f507c9faf25c68a49396ab8950596 | 5.3

3 vendors · 168 products

References

11 links
Show all 11 references