CVE-2026-98015: Linux kernel · net/mlx5: E-Switch: fix use-after-free in mlx5_eswitch_termtbl_put
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 12:30 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 25 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix is available that addresses the race condition by ensuring the cleanup decision and memory access occur under the protection of the termtbl_mutex. Users should apply the official kernel updates that include this fix for the affected versions.
Description
A use-after-free vulnerability in the Linux kernel's mlx5 E-Switch component was fixed. The issue occurred in mlx5_eswitch_termtbl_put() where a race condition between concurrent callers could lead to accessing freed memory. The fix ensures the cleanup decision is made under a mutex and prevents use-after-free by not touching the freed object afterward.
References
- ubuntu.com/security/CVE-2026-98015 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98015 (opens in a new tab)
- git.kernel.org/stable/c/304ea40ef4561671503c36e47da44a0a31b71e36 (opens in a new tab)
- git.kernel.org/stable/c/7ee07f601f8f507c9faf25c68a49396ab8950596 (opens in a new tab)
- git.kernel.org/stable/c/18b2969073879b9cce24e1a78b118bdad54518d1 (opens in a new tab)
- git.kernel.org/stable/c/e393789e92310d7c66f57c876101779c90816a12 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-98015 (opens in a new tab)
- git.kernel.org/stable/c/92f581cac93a71723456ac79ef54d9f60a251b42 (opens in a new tab)
- git.kernel.org/stable/c/a5833fdf53350b8b95a558fcf0056ddb1c0fe154 (opens in a new tab)
- git.kernel.org/stable/c/b1398c9dfb5d3d4faaf6905ff7d98110a5d2c797 (opens in a new tab)
- git.kernel.org/stable/c/e3ee194a790896fa92fea20b5385a354be2f2c12 (opens in a new tab)