--- id: CVE-2026-46316 title: >- 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()… summary: >- 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()… severity: critical cvss: 9.3 cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H' cwe: - CWE-911 vendor: linux product: linux_kernel affected: - 'linux_kernel >= 6.10, < 6.12.93' - 'linux_kernel >= 6.13, < 6.18.35' - 'linux_kernel >= 6.19, < 7.0.12' - linux_kernel = 7.1 patched: - linux_kernel 7.0.12 published: '2026-06-09' updated: '2026-09-16' sourceUpdated: '2026-09-16T13:18:00.307' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-46316' references: - url: 'https://git.kernel.org/stable/c/13031fb6b8357fbbcded2a7f4cba73e4781ee594' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/2bbc395e81bd29c543a0529a678327e932a7ec69' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/9121f4605ab94969f62d1b5714ca3c6c69bd202f' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://git.kernel.org/stable/c/b7b72e88046328c9fdc638fe887d4240257dd5dc' label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - url: 'https://access.redhat.com/errata/RHSA-2026:34911' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:36018' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:38902' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:39371' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:40764' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:40779' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:40787' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:44231' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/security/cve/CVE-2026-46316' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2486982' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46316.json label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://www.cve.org/CVERecord?id=CVE-2026-46316' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-46316' - url: >- https://lore.kernel.org/linux-cve-announce/2026060936-CVE-2026-46316-f761@gregkh/T - url: 'https://www.openwall.com/lists/oss-security/2026/06/10/16' tags: - nvd - exploit-available - csaf - vex - red-hat - cve.org - score-dispute epss: 0.00204 epssPercentile: 0.09191 exploits: github: 1 githubRepos: - 'https://github.com/suominen/itscape' checkedAt: '2026-09-25T08:20:58.482Z' exploitAvailable: true scores: nvd: 9.3 vendor: 7 cna: 9.3 ingestedAt: '2026-07-03T14:03:37.083Z' --- ## Overview 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. ## Affected - `linux_kernel >= 6.10, < 6.12.93` - `linux_kernel >= 6.13, < 6.18.35` - `linux_kernel >= 6.19, < 7.0.12` - `linux_kernel = 7.1` ## Remediation Upgrade past the affected range: - `linux_kernel 7.0.12` ## Vendor advisories - **RHSA-2026:44231** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.19 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:44231) - **RHSA-2026:40787** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.20 · released 2026-07-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:40787) - **RHSA-2026:40779** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.21 · released 2026-07-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:40779) - **RHSA-2026:40764** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.22 · released 2026-07-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:40764) - **RHSA-2026:39371** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0), Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0), Red Hat Enterprise Linux Real Time EUS (v. 10.0) · released 2026-07-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:39371) - **RHSA-2026:34911** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), Red Hat Enterprise Linux Real Time (v. 10) · released 2026-07-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:34911) - **RHSA-2026:38902** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6), Red Hat Enterprise Linux Real Time EUS (v.9.6) · released 2026-07-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:38902) - **RHSA-2026:36018** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-07-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:36018) - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 9, Red Hat Enterprise Linux for NVIDIA 26 · no fix planned: Red Hat Enterprise Linux 9, Red Hat Enterprise Linux for NVIDIA 26 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46316.json)