KVM: arm64: Fix AArch32 DBGBXVR<n> handling
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 6.18.55, 7.2.9
- 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
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Fix AArch32 DBGBXVR<n> handling The consolidation of the breakpoint and watchpoint register accessors switched DBGBXVR<n> from trap_bvr() to trap_dbg_wb_reg(). The latter selects backing storage with demux_wb_reg(), which only handles Op2 values 4 through 7. Since DBGBXVR<n> uses Op2 1, an AArch32 guest access hits KVM_BUG_ON() and marks the VM dead. DBGBXVR<n> aliases DBGBVR<n>_EL1[63:32], and its AA32(HI) descriptor already selects the upper half. Map Op2 1 to dbg_bvr[] alongside Op2 4, restoring the pre-regression behavior.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 3ce9f3357e9e099f02feaa002769eb99ef1138cd · fixed in 8530a05b304d312fe7dfbc5df7d3e87cc31b256a; From 3ce9f3357e9e099f02feaa002769eb99ef1138cd · fixed in af6813d16ace2765011ca1c567be86ade1d1ee8e; From 3ce9f3357e9e099f02feaa002769eb99ef1138cd · fixed in 6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6d
- Linux Linux
6.14
- KernelLinux
From 6.14.0 · fixed in 6.18.55; From 6.19.0 · fixed in 7.2.9