CVE-2026-98546
- Source
- https://cve.org/CVERecord?id=CVE-2026-98546
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98546.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-98546
- Downstream
- Published
- 2026-10-18T15:18:14Z
- Modified
- 2026-10-19T02:46:44Z
- Summary
- arm64/boot: Disable trapping of PMZR_EL0 writes to EL2
- Details
-
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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98546.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/071f51188a5d8ec10535541255587976d12fc7d8
- https://git.kernel.org/stable/c/2bc6b218717b9d08f466f88209251d54bc09b207
- https://git.kernel.org/stable/c/bb8c90c86441c090e9036f019cf1b4d7894a2c40
- https://git.kernel.org/stable/c/ce71865bf43f88bed9d9218e9218e537150be506
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98546.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-98546
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced686d8f7b592f3466f44aea653c8147611b351c83Fixedbb8c90c86441c090e9036f019cf1b4d7894a2c40
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced858c7bfcb35e1100b58bb63c9f562d86e09418d9Fixed071f51188a5d8ec10535541255587976d12fc7d8Fixedce71865bf43f88bed9d9218e9218e537150be506Fixed2bc6b218717b9d08f466f88209251d54bc09b207
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.12.25Fixed6.12.112
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.14.4Fixed6.15
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced882f78400322c0aec4b641a7168adad9a66bc0c2