CVE-2026-98634: Linux kernel · scsi: sd_zbc: Reject disks with too many zones
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in d8791ae55d85dfaeafa20ea48365482a0cc5a107 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 17:16 UTC
Rated Low by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in d8791ae55d85dfaeafa20ea48365482a0cc5a107, b6ec0f79745967c751c85df373062c8d15e45fc4, 3ddf8383b54456f19fd73d3cebed81bd250c7388 +1
Exploitation evidence
Disclosed: evidence found.
CVE published 18 Oct 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
Upgrade Linux kernel to d8791ae55d85dfaeafa20ea48365482a0cc5a107, b6ec0f79745967c751c85df373062c8d15e45fc4, 3ddf8383b54456f19fd73d3cebed81bd250c7388 or 0af16d8be3ec7ff28bb56a0da79c9aed66ac2c3b.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix has been implemented in the Linux kernel to reject devices reporting more than INT_MAX zones at scan time. Users should update to the fixed kernel versions identified by the commits d8791ae55d85dfaeafa20ea48365482a0cc5a107, b6ec0f79745967c751c85df373062c8d15e45fc4, 3ddf8383b54456f19fd73d3cebed81bd250c7388, and 0af16d8be3ec7ff28bb56a0da79c9aed66ac2c3b to resolve this issue.
Description
A vulnerability in the Linux kernel's SCSI subsystem (sd_zbc) involves improper handling of disks reporting an excessive number of zones. The kernel's sd_zbc_read_zones() function truncates zone counts exceeding 32 bits, leading to inconsistent zone resource allocation. Additionally, sd_zbc_report_zones() uses a signed integer for zone indexing, which can overflow for devices reporting more than INT_MAX zones. The kernel now rejects such devices at scan time to prevent inconsistent zone bookkeeping.
References
- git.kernel.org/stable/c/d8791ae55d85dfaeafa20ea48365482a0cc5a107 (opens in a new tab)
- git.kernel.org/stable/c/0af16d8be3ec7ff28bb56a0da79c9aed66ac2c3b (opens in a new tab)
- git.kernel.org/stable/c/3ddf8383b54456f19fd73d3cebed81bd250c7388 (opens in a new tab)
- git.kernel.org/stable/c/b6ec0f79745967c751c85df373062c8d15e45fc4 (opens in a new tab)