Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.10, < 6.12.93 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/13031fb6b8357fbbcded2a7f4cba73e4781ee594Patch
- https://git.kernel.org/stable/c/2bbc395e81bd29c543a0529a678327e932a7ec69Patch
- https://git.kernel.org/stable/c/9121f4605ab94969f62d1b5714ca3c6c69bd202fPatch
- https://git.kernel.org/stable/c/b7b72e88046328c9fdc638fe887d4240257dd5dcPatch
- https://access.redhat.com/errata/RHSA-2026:34911Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:36018Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:38902
- https://access.redhat.com/errata/RHSA-2026:39371
- https://access.redhat.com/errata/RHSA-2026:40764
- https://access.redhat.com/errata/RHSA-2026:40779
- https://access.redhat.com/errata/RHSA-2026:40787
- https://access.redhat.com/errata/RHSA-2026:44231
- https://access.redhat.com/security/cve/CVE-2026-46316Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2486982Third Party Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46316.jsonThird Party Advisory
FAQ
What is CVE-2026-46316?
CVE-2026-46316 is a vulnerability with a CVSS score of 9.3 (CRITICAL). 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...
How severe is CVE-2026-46316?
CVE-2026-46316 has been rated CRITICAL with a CVSS base score of 9.3/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-46316?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.