KVM: arm64: vgic-its: Drop the translation cache reference only for...

9.3 / 10

CRITICAL

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Description

In the Linux kernel, the following vulnerability has been resolved:

KVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry

vgic_its_invalidate_cache() walks the per-ITS translation cache with
xa_for_each() and drops the cache's reference on each entry with
vgic_put_irq(). It puts the iterated pointer, though, rather than the
value returned by xa_erase().

The function is called from contexts that do not exclude one another: the
ITS command handlers hold its_lock, the GITS_CTLR write path holds
cmd_lock, and the path that clears EnableLPIs in a redistributor's
GICR_CTLR holds neither. Two or more of them can drain the same cache
concurrently, and if each one observes the same entry, erases it and then
puts it, the single reference the cache holds on that entry is dropped
more than once. The entry can then be freed while an ITE still maps it.

xa_erase() is atomic and returns the previous entry, so put only the entry
that this context actually removed. The cache reference is then dropped
exactly once per entry even when the invalidations run concurrently, and
the behavior is unchanged when only one context runs.

AI Analysis

A vulnerability in the Linux kernel's KVM: arm64: vgic-its component allows for a potential use-after-free scenario due to incorrect handling of translation cache references.

Basic Information

ID CVE-2026-46316

Source Linux

Published Jun 9, 2026 at 11:52

Modified Jun 14, 2026 at 04:30

Affected Product

Vendor Linux

Product Linux

Version 8201d1028caa4fae88e222c4e8cf541fdf45b821

Affected Versions Linux Linux 8201d1028caa4fae88e222c4e8cf541fdf45b821
Linux Linux 8201d1028caa4fae88e222c4e8cf541fdf45b821
Linux Linux 8201d1028caa4fae88e222c4e8cf541fdf45b821
Linux Linux 8201d1028caa4fae88e222c4e8cf541fdf45b821
Linux Linux 6.10

AI Assessment

AI Score 9.3 / 10

AI Severity Critical

Vendor Linux

Product Linux Kernel

Version 6.10, 8201d1028caa4fae88e222c4e8cf541fdf45b821

References

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry\n\nvgic_its_invalidate_cache() walks the per-ITS translation cache with\nxa_for_each() and drops the cache's reference on each entry with\nvgic_put_irq(). It puts the iterated pointer, though, rather than the\nvalue returned by xa_erase().\n\nThe function is called from contexts that do not exclude one another: the\nITS command handlers hold its_lock, the GITS_CTLR write path holds\ncmd_lock, and the path that clears EnableLPIs in a redistributor's\nGICR_CTLR holds neither. Two or more of them can drain the same cache\nconcurrently, and if each one observes the same entry, erases it and then\nputs it, the single reference the cache holds on that entry is dropped\nmore than once. The entry can then be freed while an ITE still maps it.\n\nxa_erase() is atomic and returns the previous entry, so put only the entry\nthat this context actually removed. The cache reference is then dropped\nexactly once per entry even when the invalidations run concurrently, and\nthe behavior is unchanged when only one context runs.",
    "published": "2026-06-09T11:52:29.349Z",
    "modified": "2026-06-14T04:30:10.361Z",
    "type": "cve",
    "title": "KVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/b7b72e88046328c9fdc638fe887d4240257dd5dc\nhttps://git.kernel.org/stable/c/2bbc395e81bd29c543a0529a678327e932a7ec69\nhttps://git.kernel.org/stable/c/9121f4605ab94969f62d1b5714ca3c6c69bd202f\nhttps://git.kernel.org/stable/c/13031fb6b8357fbbcded2a7f4cba73e4781ee594",
    "id": "CVE-2026-46316",
    "bulletinFamily": "",
    "cwe": null,
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    "sourceData": "Linux Linux 8201d1028caa4fae88e222c4e8cf541fdf45b821\nLinux Linux 8201d1028caa4fae88e222c4e8cf541fdf45b821\nLinux Linux 8201d1028caa4fae88e222c4e8cf541fdf45b821\nLinux Linux 8201d1028caa4fae88e222c4e8cf541fdf45b821\nLinux Linux 6.10",
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    "ai_description": "A vulnerability in the Linux kernel's KVM: arm64: vgic-its component allows for a potential use-after-free scenario due to incorrect handling of translation cache references.",
    "ai_severity": "Critical",
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KVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry_CVE-2026-46316