KVM: arm64: Correctly handle end of VA space TLBI invalidation
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.18.51, 7.2.5
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The vulnerability affects the Linux kernel's KVM (Kernel-based Virtual Machine) hypervisor support on arm64 systems, specifically its TLB invalidation logic for virtual addresses. Due to an address rollover error at the end of the virtual address space, certain TLB invalidations could fail, potentially leaving stale translations in place.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Correctly handle end of VA space TLBI invalidation Our TLB invalidation by VA code is based on comparing two ranges, one defined by the TLB, and one defined by the TLBI instruction. Each range is defined by a start and a size. However, the way the comparison is done doesn't account for address rollover, as it compares an address with (base + size). This works nicely until this expression represent the last page/block in the TTBR1 VA space, as the result is a big fat 0. And a failed TLB invalidation. Rewrite the comparison in a way that is immune to the address rollover (making the end address inclusive instead of exclusive), and move this into a common helper that is used by both VA and IPA invalidations, as suggested by Hyunwoo Kim (although the IPA version didn't suffer from this particular problem, obviously).
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929 · fixed in ce447651a52ec077694172af10c4fffb11f56c43; From 4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929 · fixed in c624731ca6fe59ad8909ce4108301aa7560a91d6; From 4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929 · fixed in 34af2c3e31f91a739dc175459fdbd99ed952b457
- Linux Linux
6.16
- KernelLinux
From 6.16.0 · fixed in 6.18.51; From 6.19.0 · fixed in 7.2.5