Answer in brief
CVE-2026-90325 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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
Sep 17, 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.