VulnerabilityPublished 18 Oct 2026

CVE-2026-98729: Linux kernel · x86/mm: Don't apply va_align to hugetlb mappings on AMD F15h

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in fe23680e6f1d52b8cc45d77bf7c54249508a81c7 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated Medium 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 fe23680e6f1d52b8cc45d77bf7c54249508a81c7, d2457a7e2727dc747a61a50d65c2f259afce8c45, b46b2e2de47ca9449532b0a7110ed99f79061d6e

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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to fe23680e6f1d52b8cc45d77bf7c54249508a81c7, d2457a7e2727dc747a61a50d65c2f259afce8c45 or b46b2e2de47ca9449532b0a7110ed99f79061d6e.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 1317a5e7f7b1336eac4097f0ef4f5cd7ae72f1d0, < fe23680e6f1d52b8cc45d77bf7c54249508a81c7	Fixed in fe23680e6f1d52b8cc45d77bf7c54249508a81c7
LinuxLinux	Affected ≥ 1317a5e7f7b1336eac4097f0ef4f5cd7ae72f1d0, < d2457a7e2727dc747a61a50d65c2f259afce8c45	Fixed in d2457a7e2727dc747a61a50d65c2f259afce8c45
LinuxLinux	Affected ≥ 1317a5e7f7b1336eac4097f0ef4f5cd7ae72f1d0, < b46b2e2de47ca9449532b0a7110ed99f79061d6e	Fixed in b46b2e2de47ca9449532b0a7110ed99f79061d6e
LinuxLinux	Affected =6.13	Fixed in–

AI-suggested

The vulnerability is fixed in the Linux kernel source code commits fe23680e6f1d52b8cc45d77bf7c54249508a81c7, d2457a7e2727dc747a61a50d65c2f259afce8c45, and b46b2e2de47ca9449532b0a7110ed99f79061d6e. Users should upgrade from version 6.13 to a version including these fixes. No other mitigation or workaround is indicated.

Description

A vulnerability in the Linux kernel version 6.13 affects x86 memory management on AMD F15h processors, specifically Carrizo and FX-8370E models. The issue involves incorrect application of virtual address alignment (va_align) to hugetlb mappings, causing vm_unmapped_area() to return addresses misaligned to huge page boundaries. This misalignment triggers a kernel BUG_ON during huge page teardown, potentially leading to system instability or crashes. The flaw has been fixed in specific commits addressing the alignment logic for hugetlbfs mappings.

Impact

The vulnerability can cause kernel crashes (BUG_ON) during huge page teardown on affected AMD processors running Linux kernel 6.13. This may lead to system instability or denial of service conditions. There is no indication of code execution or privilege escalation from the provided data.

Summary

The Linux kernel vulnerability CVE-2026-98729 concerns the x86 memory management subsystem on AMD F15h processors. The function get_align_mask() correctly returns huge_page_mask_align() for hugetlbfs, but get_align_bits() erroneously adds va_align.bits regardless, causing vm_unmapped_area() to return an address not aligned to the huge page boundary. This misalignment leads __unmap_hugepage_range() to hit a BUG_ON condition during teardown, which can cause kernel crashes. The issue affects AMD Carrizo and FX-8370E processors. The fix involves passing the file pointer to get_align_bits() and skipping randomization for hugetlbfs to ensure proper alignment.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 09:58 UTC

Technical details

References

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