Integer underflow in Linux kernel NVMe multipath ANA log checks
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 5 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
The Linux kernel from 4.19 is affected in its NVMe multipath code. The ANA log parser subtracts an untrusted object size from the remaining buffer size before checking the current offset, so a size_t underflow lets it read beyond the ANA log buffer. The ANA log header and group descriptors supply the group and namespace ID counts that trigger this.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
In the Linux kernel, the following vulnerability has been resolved: nvme-multipath: fix underflow in ANA log bounds checks The number of ANA groups advertised through Identify Controller sizes the ANA log buffer. The ANA log header and group descriptors independently supply the number of groups and namespace IDs to parse. Both bounds checks subtract an untrusted object size from ana_log_size before comparing the current offset. If the object is larger than the buffer, the size_t subtraction underflows and lets the parser read beyond ana_log_buf. Check the current offset before the first subtraction and compare each object size with the remaining buffer instead. This rejects inconsistent ANA data before dereferencing a truncated group descriptor or walking an oversized namespace ID array.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.19 and later | 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.56, 7.2.10, 7.3 | Patch available | CNA |
- Linux VendorLinux Affected 4.19 and later Fixed in 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.56, 7.2.10, 7.3 Patch available CNA
Remediation
Update the Linux kernel to 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.56, 7.2.10 or 7.3, depending on the branch in use. Red Hat Enterprise Linux 8, 9 and 10 and Red Hat OpenShift Container Platform 4 and 5 are affected without a fix, and Red Hat lists no plan for them.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
- Fix · CNA Linux (Linux) Fixed in 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.56, 7.2.10, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-18 Threatist record created from CVE-2026-98726
- 2026-10-18 Alias added: GHSA-6fg9-pffg-wphf
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-21 Fix available: Linux/Linux@3045128294d347fd38542ad6e174b1b34d9c0751, Linux/[email protected] · CNA
- 2026-10-21 1 new reference · CNA
- 2026-10-23 Affected versions changed · Red Hat
- 2026-10-23 CVSS score added · Red Hat
- 2026-10-30 Fix available: Linux/Linux@08ab1e2dddf26248d5e6246046096b281cf5a319, Linux/[email protected], Linux/[email protected] +3 · CNA
- 2026-10-30 3 new references · CNA
- 2026-11-06 Affected versions changed · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/52c4294f3c26ec9db0e6f2e599096673d6f0f34d
- https://git.kernel.org/stable/c/fe6e003c132b7c204f63e7a7ec422904fa3141b6
- https://git.kernel.org/stable/c/08ab1e2dddf26248d5e6246046096b281cf5a319
- https://git.kernel.org/stable/c/3045128294d347fd38542ad6e174b1b34d9c0751
- https://git.kernel.org/stable/c/03a0c21f0fd7a872953aae5714303d8f38d1e567
- https://git.kernel.org/stable/c/49e8a3224c91fd5fbf22f4adcca6c8209cfdd6fe
- https://git.kernel.org/stable/c/e5cdb0c0a51e8ff49914ae16ef5360010c40cc85
- https://git.kernel.org/stable/c/63fa2d9c9c37020bd2703fe2a6a38027b5abeb15
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Sources
- CVE-2026-98726 · CVE Program
- CVE-2026-98726 · NVD
- FIRST EPSS
- GHSA-6fg9-pffg-wphf · GitHub Advisory Database · CC BY 4.0
- CVE-2026-98726 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences