# CVE-2025-68336: linux: In the Linux kernel, the following vulnerability has been resolved:  locking/spinlock/debug: Fix data-race in do_raw_...

CVE-2025-68336 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-68336, released December 22, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-68336
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0047
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 22, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  locking/spinlock/debug: Fix data-race in do_raw_write_lock  KCSAN reports:  BUG: KCSAN: data-race in do_raw_write_lock / do_raw_write_lock  write (marked) to 0xffff800009cf504c of 4 bytes by task 1102 on cpu 1:  do_raw_write_lock+0x120/0x204  _raw_write_lock_irq  do_exit  call_usermodehelper_exec_async  ret_from_fork  read to 0xffff800009cf504c of 4 bytes by task 1103 on cpu 0:  do_raw_write_lock+0x88/0x204  _raw_write_lock_irq  do_exit  call_usermodehelper_exec_async  ret_from_fork  value changed: 0xffffffff -> 0x00000001  Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1103 Comm: kworker/u4:1 6.1.111  Commit 1a365e822372 ("locking/spinlock/debug: Fix various data races") has adressed most of these races, but seems to be not consistent/not complete.  >From do_raw_write_lock() only debug_write_lock_after() part has been converted to WRITE_ONCE(), but not debug_write_lock_before() part. Do it now.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.162-1 | [DEBIAN-CVE-2025-68336](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68336.md) | Dec 22, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.12.63-1 | [DEBIAN-CVE-2025-68336](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68336.md) | Dec 22, 2025 |
| Linux | linux Debian 14 | 6.17.12-1 | [DEBIAN-CVE-2025-68336](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68336.md) | Dec 22, 2025 |

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