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CVE-2026-98900

UnknownEPSS 0.18%

Last modified

CVE-2026-98900 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: xen/gntalloc: validate grant count before allocation gntalloc_ioctl_alloc() allocates the grant-id array before checking whether the requested count fits within the global grant limit. Counts above that limit cannot succeed, so reject them before the user-controlled allocation reaches kcalloc(). Use a subtraction-based check while holding gref_mutex so adding the requested count cannot wrap. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: xen/gntalloc: validate grant count before allocation gntalloc_ioctl_alloc() allocates the grant-id array before checking whether the requested count fits within the global grant limit. Counts above that limit cannot succeed, so reject them before the user-controlled allocation reaches kcalloc(). Use a subtraction-based check while holding gref_mutex so adding the requested count cannot wrap. Also cast the count before advancing the per-file index so the page-size multiplication is performed in 64-bit arithmetic.

Metrics

EPSS Probability
0.18%

7.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= dd3140588d9551235ebc2a0dacdca098e7677573, < e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8; >= dd3140588d9551235ebc2a0dacdca098e7677573, < 71a0cf87e19fb35c4292ca88985e376e613c900a; >= dd3140588d9551235ebc2a0dacdca098e7677573, < 641de086a05f349de7fc548612432bc2fed721ca; >= dd3140588d9551235ebc2a0dacdca098e7677573, < 720554c04acba80018ded069d3e0984bebaee891; >= dd3140588d9551235ebc2a0dacdca098e7677573, < 84d5727cef8eb9c8a28210ad248f1c70b223b065; >= dd3140588d9551235ebc2a0dacdca098e7677573, < 231542f4e43cf9837cb520664545e85fbe666b7b; >= dd3140588d9551235ebc2a0dacdca098e7677573, < 2299822f3f466b5dcad2377bf63986199f881a6b
LinuxLinux2.6.39

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98900?
In the Linux kernel, the following vulnerability has been resolved: xen/gntalloc: validate grant count before allocation gntalloc_ioctl_alloc() allocates the grant-id array before checking whether the requested count fits within the global grant limit. Counts above that limit cannot succeed, so reject them before the user-controlled allocation reaches kcalloc(). Use a subtraction-based check while holding gref_mutex so adding the requested count cannot wrap. Also cast the count before advancing the per-file index so the page-size multiplication is performed in 64-bit arithmetic.
How severe is CVE-2026-98900?
Severity scoring for CVE-2026-98900 is pending analysis. The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2026-98900?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST