{ "cveId": "CVE-2025-21809", "url": "https://patchblox.com/security/cve/CVE-2025-21809", "summary": "CVE-2025-21809 is fixed in 36 products on 1 platform, first by DEBIAN-CVE-2025-21809, released February 27, 2025. It is not reported as exploited. Patch Radar priority: Routine.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: rxrpc, afs: Fix peer hash locking vs RCU callbac...", "description": "In the Linux kernel, the following vulnerability has been resolved: rxrpc, afs: Fix peer hash locking vs RCU callback In its address list, afs now retains pointers to and refs on one or more rxrpc_peer objects. The address list is freed under RCU and at this time, it puts the refs on those peers. Now, when an rxrpc_peer object runs out of refs, it gets removed from the peer hash table and, for that, rxrpc has to take a spinlock. However, it is now being called from afs\u0027s RCU cleanup, which takes place in BH context - but it is just taking an ordinary spinlock. The put may also be called from non-BH context, and so there exists the possibility of deadlock if the BH-based RCU cleanup happens whilst the hash spinlock is held. This led to the attached lockdep complaint. Fix this by changing spinlocks of rxnet-\u003Epeer_hash_lock back to BH-disabling locks. ================================ WARNING: inconsistent lock state 6.13.0-rc5-build2\u002B #1223 Tainted: G E -------------------------------- inconsistent {SOFTIRQ-ON-W} -\u003E {IN-SOFTIRQ-W} usage. swapper/1/0 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88810babe228 (\u0026rxnet-\u003Epeer_hash_lock){\u002B.?.}-{3:3}, at: rxrpc_put_peer\u002B0xcb/0x180 {SOFTIRQ-ON-W} state was registered at: mark_usage\u002B0x164/0x180 __lock_acquire\u002B0x544/0x990 lock_acquire.part.0\u002B0x103/0x280 _raw_spin_lock\u002B0x2f/0x40 rxrpc_peer_keepalive_worker\u002B0x144/0x440 process_one_work\u002B0x486/0x7c0 process_scheduled_works\u002B0x73/0x90 worker_thread\u002B0x1c8/0x2a0 kthread\u002B0x19b/0x1b0 ret_from_fork\u002B0x24/0x40 ret_from_fork_asm\u002B0x1a/0x30 irq event stamp: 972402 hardirqs last enabled at (972402): [\u003Cffffffff8244360e\u003E] _raw_spin_unlock_irqrestore\u002B0x2e/0x50 hardirqs last disabled at (972401): [\u003Cffffffff82443328\u003E] _raw_spin_lock_irqsave\u002B0x18/0x60 softirqs last enabled at (972300): [\u003Cffffffff810ffbbe\u003E] handle_softirqs\u002B0x3ee/0x430 softirqs last disabled at (972313): [\u003Cffffffff810ffc54\u003E] __irq_exit_rcu\u002B0x44/0x110 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(\u0026rxnet-\u003Epeer_hash_lock); \u003CInterrupt\u003E lock(\u0026rxnet-\u003Epeer_hash_lock); *** DEADLOCK *** 1 lock held by swapper/1/0: #0: ffffffff83576be0 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire\u002B0x7/0x30 stack backtrace: CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G E 6.13.0-rc5-build2\u002B #1223 Tainted: [E]=UNSIGNED_MODULE Hardware name: ASUS All Series/H97-PLUS, BIOS 2306 10/09/2014 Call Trace: \u003CIRQ\u003E dump_stack_lvl\u002B0x57/0x80 print_usage_bug.part.0\u002B0x227/0x240 valid_state\u002B0x53/0x70 mark_lock_irq\u002B0xa5/0x2f0 mark_lock\u002B0xf7/0x170 mark_usage\u002B0xe1/0x180 __lock_acquire\u002B0x544/0x990 lock_acquire.part.0\u002B0x103/0x280 _raw_spin_lock\u002B0x2f/0x40 rxrpc_put_peer\u002B0xcb/0x180 afs_free_addrlist\u002B0x46/0x90 [kafs] rcu_do_batch\u002B0x2d2/0x640 rcu_core\u002B0x2f7/0x350 handle_softirqs\u002B0x1ee/0x430 __irq_exit_rcu\u002B0x44/0x110 irq_exit_rcu\u002B0xa/0x30 sysvec_apic_timer_interrupt\u002B0x7f/0xa0 \u003C/IRQ\u003E", "published": "2025-02-27T20:16:03Z", "severity": "medium", "cvss": 5.5, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "epss": 0.00315, "epssPercentile": 0.24601, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "kernel-uek", "release": "ol 10", "fixedVersion": "0:6.12.0-101.33.4.3.el9uek", "fix": "ELSA-2025-20480", "url": "https://patchblox.com/security/fix/linux/elsa-2025-20480", "released": "2025-07-17T00:00:00Z" }, { "platform": "linux", "product": "kernel-uek", "release": "ol 9", 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