{"id":"CVE-2026-98832","title":"blk-cgroup: save IRQ state in blkg_tryget_closest()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: save IRQ state in blkg_tryget_closest()\n\nbio_set_dev() associates the bio with a blkg through bio_associate_blkg().\nIf the blkg lookup misses, blkg_tryget_c…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 9327a865e395a53f67dffac4710beb1d4730495e < 9fcf4317384ce6758c3127a6e8914c54cbb9c8cc","Linux >= 9327a865e395a53f67dffac4710beb1d4730495e < 327c428ba79b13e4cc5253333a9d5c0aa5579bdf","Linux 7.2"],"published":"2026-10-18","updated":"2026-10-19","sourceUpdated":"2026-10-19T09:26:24.782Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98832","references":[{"url":"https://git.kernel.org/stable/c/9fcf4317384ce6758c3127a6e8914c54cbb9c8cc"},{"url":"https://git.kernel.org/stable/c/327c428ba79b13e4cc5253333a9d5c0aa5579bdf"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T16:47:32.470Z","slug":"CVE-2026-98832","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: save IRQ state in blkg_tryget_closest()\n\nbio_set_dev() associates the bio with a blkg through bio_associate_blkg().\nIf the blkg lookup misses, blkg_tryget_closest() takes q->queue_lock with\nspin_lock_irq() and releases it with spin_unlock_irq(), which\nunconditionally enables local interrupts.\n\nCallers may call bio_set_dev() with interrupts already disabled, e.g.\ndm-thin's pool_map() does so while holding pool->lock taken with\nspin_lock_irq().  The nested spin_unlock_irq() then enables interrupts\nwhile pool->lock is still held, so an I/O completion softirq can run on\nthe same CPU, re-acquire pool->lock (thin_endio(), or overwrite_endio()\n-> complete_mapping_preparation()) and deadlock.  lockdep reports this\nas inconsistent SOFTIRQ-ON-W to IN-SOFTIRQ-W usage.\n\nCommit 3a762de55b4e (\"block: save irq state in blkg_lookup_create()\")\nfixed the same problem while the lock lived in blkg_lookup_create(), but\ncommit 9327a865e395 (\"blk-cgroup: don't nest queue_lock under rcu in\nblkg_lookup_create()\") moved the locking into blkg_tryget_closest() and\nreverted it to spin_lock_irq().\n\nSave and restore the caller's IRQ state instead.\n\n## Affected\n\n- `Linux >= 9327a865e395a53f67dffac4710beb1d4730495e < 9fcf4317384ce6758c3127a6e8914c54cbb9c8cc`\n- `Linux >= 9327a865e395a53f67dffac4710beb1d4730495e < 327c428ba79b13e4cc5253333a9d5c0aa5579bdf`\n- `Linux 7.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}