{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-68202", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-16T13:41:40.255Z", "datePublished": "2025-12-16T13:48:30.376Z", "dateUpdated": "2026-05-11T21:48:42.294Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:48:42.294Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Fix unsafe locking in the scx_dump_state()\n\nFor built with CONFIG_PREEMPT_RT=y kernels, the dump_lock will be converted\nsleepable spinlock and not disable-irq, so the following scenarios occur:\n\ninconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.\nirq_work/0/27 [HC0[0]:SC0[0]:HE1:SE1] takes:\n(&rq->__lock){?...}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x40\n{IN-HARDIRQ-W} state was registered at:\n lock_acquire+0x1e1/0x510\n _raw_spin_lock_nested+0x42/0x80\n raw_spin_rq_lock_nested+0x2b/0x40\n sched_tick+0xae/0x7b0\n update_process_times+0x14c/0x1b0\n tick_periodic+0x62/0x1f0\n tick_handle_periodic+0x48/0xf0\n timer_interrupt+0x55/0x80\n __handle_irq_event_percpu+0x20a/0x5c0\n handle_irq_event_percpu+0x18/0xc0\n handle_irq_event+0xb5/0x150\n handle_level_irq+0x220/0x460\n __common_interrupt+0xa2/0x1e0\n common_interrupt+0xb0/0xd0\n asm_common_interrupt+0x2b/0x40\n _raw_spin_unlock_irqrestore+0x45/0x80\n __setup_irq+0xc34/0x1a30\n request_threaded_irq+0x214/0x2f0\n hpet_time_init+0x3e/0x60\n x86_late_time_init+0x5b/0xb0\n start_kernel+0x308/0x410\n x86_64_start_reservations+0x1c/0x30\n x86_64_start_kernel+0x96/0xa0\n common_startup_64+0x13e/0x148\n\n other info that might help us debug this:\n Possible unsafe locking scenario:\n\n CPU0\n ----\n lock(&rq->__lock);\n \n lock(&rq->__lock);\n\n *** DEADLOCK ***\n\n stack backtrace:\n CPU: 0 UID: 0 PID: 27 Comm: irq_work/0\n Call Trace:\n \n dump_stack_lvl+0x8c/0xd0\n dump_stack+0x14/0x20\n print_usage_bug+0x42e/0x690\n mark_lock.part.44+0x867/0xa70\n ? __pfx_mark_lock.part.44+0x10/0x10\n ? string_nocheck+0x19c/0x310\n ? number+0x739/0x9f0\n ? __pfx_string_nocheck+0x10/0x10\n ? __pfx_check_pointer+0x10/0x10\n ? kvm_sched_clock_read+0x15/0x30\n ? sched_clock_noinstr+0xd/0x20\n ? local_clock_noinstr+0x1c/0xe0\n __lock_acquire+0xc4b/0x62b0\n ? __pfx_format_decode+0x10/0x10\n ? __pfx_string+0x10/0x10\n ? __pfx___lock_acquire+0x10/0x10\n ? __pfx_vsnprintf+0x10/0x10\n lock_acquire+0x1e1/0x510\n ? raw_spin_rq_lock_nested+0x2b/0x40\n ? __pfx_lock_acquire+0x10/0x10\n ? dump_line+0x12e/0x270\n ? raw_spin_rq_lock_nested+0x20/0x40\n _raw_spin_lock_nested+0x42/0x80\n ? raw_spin_rq_lock_nested+0x2b/0x40\n raw_spin_rq_lock_nested+0x2b/0x40\n scx_dump_state+0x3b3/0x1270\n ? finish_task_switch+0x27e/0x840\n scx_ops_error_irq_workfn+0x67/0x80\n irq_work_single+0x113/0x260\n irq_work_run_list.part.3+0x44/0x70\n run_irq_workd+0x6b/0x90\n ? __pfx_run_irq_workd+0x10/0x10\n smpboot_thread_fn+0x529/0x870\n ? __pfx_smpboot_thread_fn+0x10/0x10\n kthread+0x305/0x3f0\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x40/0x70\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30\n \n\nThis commit therefore use rq_lock_irqsave/irqrestore() to replace\nrq_lock/unlock() in the scx_dump_state()." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/sched/ext.c" ], "versions": [ { "version": "07814a9439a3b03d79a1001614b5bc1cab69bcec", "lessThan": "13d1c96d3a9f208bc1aa8642f6362dca25a157d2", "status": "affected", "versionType": "git" }, { "version": "07814a9439a3b03d79a1001614b5bc1cab69bcec", "lessThan": "b6109750063d3b9aca1c57031213ac5485a06c54", "status": "affected", "versionType": "git" }, { "version": "07814a9439a3b03d79a1001614b5bc1cab69bcec", "lessThan": "5f02151c411dda46efcc5dc57b0845efcdcfc26d", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/sched/ext.c" ], "versions": [ { "version": "6.12", "status": "affected" }, { "version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.59", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17.9", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.12.59" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.17.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/13d1c96d3a9f208bc1aa8642f6362dca25a157d2" }, { "url": "https://git.kernel.org/stable/c/b6109750063d3b9aca1c57031213ac5485a06c54" }, { "url": "https://git.kernel.org/stable/c/5f02151c411dda46efcc5dc57b0845efcdcfc26d" } ], "title": "sched_ext: Fix unsafe locking in the scx_dump_state()", "x_generator": { "engine": "bippy-1.2.0" } } } }