CVE-2026-98546
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
arm64/boot: Disable trapping of PMZR_EL0 writes to EL2
In the Linux kernel, the following vulnerability has been resolved: arm64/boot: Disable trapping of PMZR_EL0 writes to EL2 __init_el2_fgt2() writes one mask to both HDFGRTR2_EL2 and HDFGWTR2_EL2. PMZR_EL0 is write-only, so its trap bit, nPMZR_EL0, exists only in HDFGWTR2_EL2 and is therefore never set: a PMZR_EL0 write from the host traps to EL2, where the nVHE hypervisor has no handler and BUG()s. The kernel never writes PMZR_EL0, but kernel.perf_user_access=1 has the PMU driver set PMUSERENR_EL0.UEN for a task with a user-read event, so a write from EL0 reaches the trap and takes the host down without a panic message. Accumulate the HDFGWTR2_EL2 bits separately, as __init_el2_fgt() already does for HDFGWTR_EL2, and set nPMZR_EL0 with the other FEAT_PMUv3p9 bits.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 686d8f7b592f3466f44aea653c8147611b351c83 | affected | git | bb8c90c86441c090e9036f019cf1b4d7894a2c40 | Unavailable | None listed |
| 858c7bfcb35e1100b58bb63c9f562d86e09418d9 | affected | git | 071f51188a5d8ec10535541255587976d12fc7d8 | Unavailable | None listed |
| 858c7bfcb35e1100b58bb63c9f562d86e09418d9 | affected | git | ce71865bf43f88bed9d9218e9218e537150be506 | Unavailable | None listed |
| 858c7bfcb35e1100b58bb63c9f562d86e09418d9 | affected | git | 2bc6b218717b9d08f466f88209251d54bc09b207 | Unavailable | None listed |
| 882f78400322c0aec4b641a7168adad9a66bc0c2 | affected | git | Unavailable | Unavailable | None listed |
| 6.12.25 | affected | semver | 6.12.112 | Unavailable | None listed |
| 6.14.4 | affected | semver | 6.15 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 6.15 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 6.15 | Unavailable | None listed |
| 6.12.112 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.55 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.2.9 | unaffected | semver | Unavailable | 7.2.* | None listed |
| 7.3 | unaffected | original_commit_for_fix | Unavailable | * | None listed |