CVE-2026-99156: Linux kernel · scsi: st: Fix use-after-free race between st_remove() and st_open()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 30 Oct 2026, 03:51 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 28 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 29 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10linuxpkg:deb/ubuntu/linux?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=stonkingOther 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 reorders the removal of the scsi_tape index and reference dropping to prevent use-after-free conditions. Users should apply the updated Linux kernel versions that include this patch to mitigate the issue.
Description
A use-after-free race condition was identified and fixed in the Linux kernel's SCSI tape driver (st). The flaw occurred due to improper ordering in the removal and reference counting of scsi_tape structures, leading to potential access of freed memory during concurrent open and remove operations.
References
- ubuntu.com/security/CVE-2026-99156 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-99156 (opens in a new tab)
- git.kernel.org/stable/c/18a0e3733ce38718688e813e5e2d1106bd4830e5 (opens in a new tab)
- git.kernel.org/stable/c/a1647b653549ff29f0422a63eabf329b842f3822 (opens in a new tab)
- git.kernel.org/stable/c/71caf7f84bd62a4bf91cc95abd2de690afb8d15f (opens in a new tab)