Answer in brief
CVE-2026-98900 records a Unknown severity vulnerability in xen/gntalloc: validate grant count before allocation. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <71a0cf87e19fb35c4292ca88985e376e613c900a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <641de086a05f349de7fc548612432bc2fed721ca || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <720554c04acba80018ded069d3e0984bebaee891 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <84d5727cef8eb9c8a28210ad248f1c70b223b065 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <231542f4e43cf9837cb520664545e85fbe666b7b || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2299822f3f466b5dcad2377bf63986199f881a6b || >=0 <5.10.271 || >=0 <5.15.222 || >=0 <6.1.189 || >=0 <6.6.158 || >=0 <6.12.111 || >=0 <6.18.53 | e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8, 71a0cf87e19fb35c4292ca88985e376e613c900a, 641de086a05f349de7fc548612432bc2fed721ca, 720554c04acba80018ded069d3e0984bebaee891, 84d5727cef8eb9c8a28210ad248f1c70b223b065, 231542f4e43cf9837cb520664545e85fbe666b7b, 2299822f3f466b5dcad2377bf63986199f881a6b, 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53 |
Published upstream
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 23, 2026
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.
Quoted source text, attributed separately from HOL analysis.