Answer in brief
CVE-2026-90325 records a High severity (CVSS 7.8) vulnerability in blk-cgroup: skip dying blkg in blkcg_activate_policy(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=81c1188905f88b77743d1fdeeedfc8cb7b67787d <b5dae1cd0d8368b4338430ff93403df67f0b8bcc || >=bfe46d2efe46c5c952f982e2ca94fe2ec5e58e2a <083b58373463a6e5ee60ecb135269348f68ad7df || >=f1c006f1c6850c14040f8337753a63119bba39b9 <1a267295b1ea6a6477963f3fda84adfecd48fcad || >=f1c006f1c6850c14040f8337753a63119bba39b9 <7337d012ca3fc3a6a2d1c8e2a19c6d97c38b410d || >=f1c006f1c6850c14040f8337753a63119bba39b9 <3d8c3da95c75a4d312e272fc7b4076dd3ba9115c || >=f1c006f1c6850c14040f8337753a63119bba39b9 <d8c872901e6459339374e9eea80aa919176c2ccd || >=f1c006f1c6850c14040f8337753a63119bba39b9 <5e9220389920f33b6a804d50c548cd0cd1b04634 || >=6.1.16 <6.1.17 || >=6.2.3 <6.2.4 | b5dae1cd0d8368b4338430ff93403df67f0b8bcc, 083b58373463a6e5ee60ecb135269348f68ad7df, 1a267295b1ea6a6477963f3fda84adfecd48fcad, 7337d012ca3fc3a6a2d1c8e2a19c6d97c38b410d, 3d8c3da95c75a4d312e272fc7b4076dd3ba9115c, d8c872901e6459339374e9eea80aa919176c2ccd, 5e9220389920f33b6a804d50c548cd0cd1b04634, 6.1.17, 6.2.4 |
| Linux/Linuxgeneric | 6.3 | Not reported |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: skip dying blkg in blkcg_activate_policy() When switching IO schedulers on a block device, blkcg_activate_policy() can race with concurrent blkcg deletion, leading to a use-after-free in rcu_accelerate_cbs. T1: T2: blkg_destroy kill(&blkg->refcnt) // blkg->refcnt=1->0 blkg_release // call_rcu(__blkg_release) ... blkg_free_workfn ->pd_free_fn(pd) elv_iosched_store elevator_switch ... iterate blkg list blkg_get(blkg) // blkg->refcnt=0->1 list_del_init(&blkg->q_node) blkg_put(pinned_blkg) // blkg->refcnt=1->0 blkg_release // call_rcu again rcu_accelerate_cbs // uaf Fix this by checking hlist_unhashed(&blkg->blkcg_node) before getting a reference to the blkg. This is the same check used in blkg_destroy() to detect if a blkg has already been destroyed. If the blkg is already unhashed, skip processing it since it's being destroyed.
Quoted source text, attributed separately from HOL analysis.