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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-98900

xen/gntalloc: validate grant count before allocation

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • dd3140588d9551235ebc2a0dacdca098e7677573 to < e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8affected
  • dd3140588d9551235ebc2a0dacdca098e7677573 to < 71a0cf87e19fb35c4292ca88985e376e613c900aaffected
  • dd3140588d9551235ebc2a0dacdca098e7677573 to < 641de086a05f349de7fc548612432bc2fed721caaffected
  • dd3140588d9551235ebc2a0dacdca098e7677573 to < 720554c04acba80018ded069d3e0984bebaee891affected
  • dd3140588d9551235ebc2a0dacdca098e7677573 to < 84d5727cef8eb9c8a28210ad248f1c70b223b065affected
  • dd3140588d9551235ebc2a0dacdca098e7677573 to < 231542f4e43cf9837cb520664545e85fbe666b7baffected
  • dd3140588d9551235ebc2a0dacdca098e7677573 to < 2299822f3f466b5dcad2377bf63986199f881a6baffected

Linux Linux

Default version status: affected

  • 2.6.39affected
  • 0 to < 2.6.39unaffected
  • 5.10.271 to ≤ 5.10.*unaffected
  • 5.15.222 to ≤ 5.15.*unaffected
  • 6.1.189 to ≤ 6.1.*unaffected
  • 6.6.158 to ≤ 6.6.*unaffected
  • 6.12.111 to ≤ 6.12.*unaffected
  • 6.18.53 to ≤ 6.18.*unaffected
  • 7.2 to ≤ *unaffected

References