# CVE-2025-38388: linux: In the Linux kernel, the following vulnerability has been resolved: firmware: arm_ffa: Replace mutex with rwlock to... CVE-2025-38388 is fixed in 23 products on 1 platform, first by DEBIAN-CVE-2025-38388, released July 25, 2025. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2025-38388 - Priority: Routine - CVSS: 5.5 (medium) - EPSS: 0.0014 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jul 25, 2025 ## Description In the Linux kernel, the following vulnerability has been resolved: firmware: arm_ffa: Replace mutex with rwlock to avoid sleep in atomic context The current use of a mutex to protect the notifier hashtable accesses can lead to issues in the atomic context. It results in the below kernel warnings: | BUG: sleeping function called from invalid context at kernel/locking/mutex.c:258 | in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 9, name: kworker/0:0 | preempt_count: 1, expected: 0 | RCU nest depth: 0, expected: 0 | CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted 6.14.0 #4 | Workqueue: ffa_pcpu_irq_notification notif_pcpu_irq_work_fn | Call trace: | show_stack+0x18/0x24 (C) | dump_stack_lvl+0x78/0x90 | dump_stack+0x18/0x24 | __might_resched+0x114/0x170 | __might_sleep+0x48/0x98 | mutex_lock+0x24/0x80 | handle_notif_callbacks+0x54/0xe0 | notif_get_and_handle+0x40/0x88 | generic_exec_single+0x80/0xc0 | smp_call_function_single+0xfc/0x1a0 | notif_pcpu_irq_work_fn+0x2c/0x38 | process_one_work+0x14c/0x2b4 | worker_thread+0x2e4/0x3e0 | kthread+0x13c/0x210 | ret_from_fork+0x10/0x20 To address this, replace the mutex with an rwlock to protect the notifier hashtable accesses. This ensures that read-side locking does not sleep and multiple readers can acquire the lock concurrently, avoiding unnecessary contention and potential deadlocks. Writer access remains exclusive, preserving correctness. This change resolves warnings from lockdep about potential sleep in atomic context. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool6.12 amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel-livepatch-6.12.37-61.105 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel6.12 amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel6.12-devel amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel6.12-headers amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel6.12-libbpf amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel6.12-libbpf-debuginfo amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel6.12-libbpf-devel amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel6.12-libbpf-static amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel6.12-tools amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | linux Debian 13.5 (trixie) | 6.12.37-1 | [DEBIAN-CVE-2025-38388](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38388.md) | Jul 25, 2025 | | Linux | linux Debian 14 | 6.12.37-1 | [DEBIAN-CVE-2025-38388](https://patchblox.com/security/data/fix/linux/debian-cve-2025-38388.md) | Jul 25, 2025 | | Linux | perf6.12 amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | python3-perf6.12 amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | | Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.37-61.105.amzn2023 | [ALAS2023-2025-1130](https://patchblox.com/security/data/fix/linux/alas2023-2025-1130.md) | Jul 29, 2025 | --- Data as of 2026-11-08T19:12:23Z UTC. 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