# CVE-2025-71181: linux: In the Linux kernel, the following vulnerability has been resolved:  rust_binder: remove spin_lock() in rust_shrink_f...

CVE-2025-71181 is fixed in linux on 1 platform by DEBIAN-CVE-2025-71181 (version 6.18.8-1), released January 31, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-71181
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 31, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  rust_binder: remove spin_lock() in rust_shrink_free_page()  When forward-porting Rust Binder to 6.18, I neglected to take commit fb56fdf8b9a2 ("mm/list_lru: split the lock to per-cgroup scope") into account, and apparently I did not end up running the shrinker callback when I sanity tested the driver before submission. This leads to crashes like the following:  	============================================ 	WARNING: possible recursive locking detected 	6.18.0-mainline-maybe-dirty #1 Tainted: G          IO 	-------------------------------------------- 	kswapd0/68 is trying to acquire lock: 	ffff956000fa18b0 (&l->lock){+.+.}-{2:2}, at: lock_list_lru_of_memcg+0x128/0x230  	but task is already holding lock: 	ffff956000fa18b0 (&l->lock){+.+.}-{2:2}, at: rust_helper_spin_lock+0xd/0x20  	other info that might help us debug this: 	 Possible unsafe locking scenario:  	       CPU0 	       ---- 	  lock(&l->lock); 	  lock(&l->lock);  	 *** DEADLOCK ***  	 May be due to missing lock nesting notation  	3 locks held by kswapd0/68: 	 #0: ffffffff90d2e260 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0x597/0x1160 	 #1: ffff956000fa18b0 (&l->lock){+.+.}-{2:2}, at: rust_helper_spin_lock+0xd/0x20 	 #2: ffffffff90cf3680 (rcu_read_lock){....}-{1:2}, at: lock_list_lru_of_memcg+0x2d/0x230  To fix this, remove the spin_lock() call from rust_shrink_free_page().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.18.8-1 | [DEBIAN-CVE-2025-71181](https://patchblox.com/security/data/fix/linux/debian-cve-2025-71181.md) | Jan 31, 2026 |

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