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CVE-2026-98900— xen/gntalloc: validate grant count before allocation

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： xen/gntalloc：在分配前验证授权（grant）数量 gntalloc_ioctl_alloc() 函数在检查请求的授权数量是否超过全局授权限制之前，就先分配了授权 ID 数组。由于超过该限制的数量注定无法成功，因此应在用户可控的分配调用到达 kcalloc() 之前，提前拒绝此类请求。 修复方案是在持有 gref_mutex 互斥锁的同时，采用基于减法的检查方式，以防止在累加请求数量时发生整数回绕（wrap）。此外，在推进每个文件的索引之前，先将数量进行类型转

AI Predicted 7.8 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 71a0cf87e19fb35c4292ca88985e376e613c900a affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 641de086a05f349de7fc548612432bc2fed721ca affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 720554c04acba80018ded069d3e0984bebaee891 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 84d5727cef8eb9c8a28210ad248f1c70b223b065 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 231542f4e43cf9837cb520664545e85fbe666b7b affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2299822f3f466b5dcad2377bf63986199f881a6b affected
< 5.10.271 affected
… +12 more rows
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I. Basic Information for CVE-2026-98900

Vulnerability Information
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Vulnerability Title
xen/gntalloc: validate grant count before allocation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8 -
Linux Linux 5.10.271 ~ 5.10.* -

II. Public POCs for CVE-2026-98900

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III. Intelligence Information for CVE-2026-98900

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Patches & Fixes for CVE-2026-98900 (6)

Same Patch Batch · Linux · 2026-10-23 · 218 CVEs total

CVE-2026-98938 rust: irq: pass RegistrationInner as cookie to request_irq
CVE-2026-98951 riscv: ptrace: Zero-initialize regset buffers before copyin
CVE-2026-98950 flow_dissector: avoid u16 truncation of hlen in bpf_flow_dissect()
CVE-2026-98949 drm/imagination: Fix reference and vm_bo handling in remap()
CVE-2026-98948 mlxsw: spectrum_flower: Fix port range register leak in tmplt_create()
CVE-2026-98947 vsock: Fix memory leak in vmci_transport_recv_dgram_cb()
CVE-2026-98946 drm/vc4: Disable the V3D interrupt across runtime suspend
CVE-2026-98945 HID: steam: Rearrange teardown sequence
CVE-2026-98944 HID: steam: Refactor registration
CVE-2026-98943 HID: steam: Clean up locking
CVE-2026-98942 sched_ext: Build the cid tables privately and publish them with RCU
CVE-2026-98941 ext4: don't enable large folios on encrypted inodes
CVE-2026-98940 ASoC: qcom: lpass-cpu: use DAI table index for playback constraints
CVE-2026-98939 x86/mm: Drop unnecessary PMD page copy when freeing
CVE-2026-98927 KVM: arm64: nv: Fix life cycle of the nested_mmus array
CVE-2026-98930 KVM: s390: Fix IRQ injection with SIGP Stop and Store Status
CVE-2026-98929 macsec: initialize SecY before registering the netdevice
CVE-2026-98928 KVM: arm64: Derive GUEST_HAS_SVE from the SVE feature bit at EL2
CVE-2026-98931 mtd: spinand: fix NULL pointer dereference with no ECC engine
CVE-2026-98926 drm/amd/display: Remove sink usage from DPMS

Showing top 20 of 218 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98900

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