Answer in brief
CVE-2026-90182 records a Unknown severity vulnerability in blk-iocost: clear delay state when freeing policy data. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic) and additional mapped packages. 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), Linux/Linux (generic), Linux/Linux (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <b9c16db833e3ff15d923282f94dddf0e10fab8c0 || >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <97cb95d2148835ae86ff916b145aef332d40439d | b9c16db833e3ff15d923282f94dddf0e10fab8c0, 97cb95d2148835ae86ff916b145aef332d40439d |
| Linux/Linuxgeneric | 5.4 | Not reported |
| Linux/Linuxgeneric | >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <b399a88eb8b16c5a1a3645fd49ff507fb82b363c || >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <b9c16db833e3ff15d923282f94dddf0e10fab8c0 || >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <97cb95d2148835ae86ff916b145aef332d40439d | b399a88eb8b16c5a1a3645fd49ff507fb82b363c, b9c16db833e3ff15d923282f94dddf0e10fab8c0, 97cb95d2148835ae86ff916b145aef332d40439d |
| Linux/Linuxgeneric | >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <6b59f976db5def818829fc1eb4efc0a5c8c2f0cf || >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <8b4d0b1b3079bbe9a5366e2c8020eb22926733b6 || >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <b399a88eb8b16c5a1a3645fd49ff507fb82b363c || >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <b9c16db833e3ff15d923282f94dddf0e10fab8c0 || >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <97cb95d2148835ae86ff916b145aef332d40439d | 6b59f976db5def818829fc1eb4efc0a5c8c2f0cf, 8b4d0b1b3079bbe9a5366e2c8020eb22926733b6, b399a88eb8b16c5a1a3645fd49ff507fb82b363c, b9c16db833e3ff15d923282f94dddf0e10fab8c0, 97cb95d2148835ae86ff916b145aef332d40439d |
| Linux/Linuxgeneric | >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <6942cb740fb17b24731728b25994eba361776011 || >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <6b59f976db5def818829fc1eb4efc0a5c8c2f0cf || >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <8b4d0b1b3079bbe9a5366e2c8020eb22926733b6 || >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <b399a88eb8b16c5a1a3645fd49ff507fb82b363c || >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <b9c16db833e3ff15d923282f94dddf0e10fab8c0 || >=7caa47151ab2e644dd221f741ec7578d9532c9a3 <97cb95d2148835ae86ff916b145aef332d40439d | 6942cb740fb17b24731728b25994eba361776011, 6b59f976db5def818829fc1eb4efc0a5c8c2f0cf, 8b4d0b1b3079bbe9a5366e2c8020eb22926733b6, b399a88eb8b16c5a1a3645fd49ff507fb82b363c, b9c16db833e3ff15d923282f94dddf0e10fab8c0, 97cb95d2148835ae86ff916b145aef332d40439d |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 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-iocost: clear delay state when freeing policy data iocg_kick_delay() turns sufficiently large debt into an explicit block-cgroup delay with blkcg_set_delay(), setting blkg->use_delay to -1 and incrementing blkcg->congestion_count. Clearing it again depends on iocg_kick_delay() running from the period timer, the waitq timer or the issue path. ioc_pd_free() removes the iocg from active_iocgs and cancels its waitq timer, and no further bios can arrive, so once it has run nothing is left which can reduce the debt and clear the delay. The blkcg stays marked congested for the rest of its life. blk_cgroup_congested() then returns true for every task in that cgroup and its descendants: page_cache_sync_ra() cuts readahead to a single page, page_cache_async_ra() skips it altogether, and __folio_throttle_swaprate() takes swap_avail_lock and schedules a throttle on anonymous folio allocation. Clear it explicitly, after the list removal and the synchronous hrtimer_cancel() so that neither timer processing nor an I/O path can re-arm it. The free callback can also see policy data which was never attached to a blkg, hence the pd->blkg check.
Quoted source text, attributed separately from HOL analysis.