Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-06-09T00:00:00 kernel: KVM: arm64: vgic-its: Drop the translation cache reference only for the erased entry 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CWE-911

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.

A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) for ARM64, specifically within the vgic-its component. This vulnerability occurs when multiple concurrent operations incorrectly drop the translation cache's reference to an entry more than once during cache invalidation. This leads to a use-after-free condition, which can result in memory corruption. The primary impact is potential system instability or a denial of service.

Red Hat Enterprise Linux 10 2026-07-02T00:00:00Z RHSA-2026:34911 kernel-0:6.12.0-211.30.1.el10_2 Red Hat Enterprise Linux 10.0 Extended Update Support 2026-07-14T00:00:00Z RHSA-2026:39371 kernel-0:6.12.0-55.88.1.el10_0 Red Hat Enterprise Linux 9 2026-07-06T00:00:00Z RHSA-2026:36018 kernel-0:5.14.0-687.22.1.el9_8 Red Hat Enterprise Linux 9 2026-07-06T00:00:00Z RHSA-2026:36018 kernel-0:5.14.0-687.22.1.el9_8 Red Hat Enterprise Linux 9.6 Extended Update Support 2026-07-13T00:00:00Z RHSA-2026:38902 kernel-0:5.14.0-570.127.1.el9_6 Red Hat OpenShift Container Platform 4.19 2026-07-29T00:00:00Z RHSA-2026:44231 rhcos-4.19.9.6.202607220857-0 Red Hat OpenShift Container Platform 4.20 2026-07-21T00:00:00Z RHSA-2026:40787 rhcos-4.20.9.6.202607151937-0 Red Hat OpenShift Container Platform 4.21 2026-07-21T00:00:00Z RHSA-2026:40779 rhcos-4.21.9.6.202607151836-0 Red Hat OpenShift Container Platform 4.22 2026-07-21T00:00:00Z RHSA-2026:40764 rhcos-4.22.9.8.202607152026-0 Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Affected kernel-rt Red Hat Enterprise Linux for NVIDIA 26 Affected kernel https://www.cve.org/CVERecord?id=CVE-2026-46316 https://nvd.nist.gov/vuln/detail/CVE-2026-46316 https://lore.kernel.org/linux-cve-announce/2026060936-CVE-2026-46316-f761@gregkh/T https://www.openwall.com/lists/oss-security/2026/06/10/16 True