blk-mq: fix blk_mq_tags double free while nr_requests grown
In the Linux kernel, the following vulnerability has been resolved:
blk-mq: fix blk_mq_tags double free while nr_requests grown
In the case user trigger tags grow by queue sysfs attribute nr_requests,
hctx->sched_tags will be freed directly and replaced with a new
allocated tags, see blk_mq_tag_update_depth().
The problem is that hctx->sched_tags is from elevator->et->tags, while
et->tags is still the freed tags, hence later elevator exit will try to
free the tags again, causing kernel panic.
Fix this problem by replacing et->tags with new allocated tags as well.
Noted there are still some long term problems that will require some
refactor to be fixed thoroughly[1].
[1] https://lore.kernel.org/all/20250815080216.410665-1-yukuai1@huaweicloud.com/
CVE 정보
EPSS
EPSS는 취약점이 악용될 가능성을 예측하는 점수 모델입니다.
EPSS 점수
EPSS 모델은 0과 1(0~100%) 사이의 확률 점수를 생성합니다. 점수가 높을수록 취약점이 악용될 가능성이 높습니다.
날짜
EPSS V0
EPSS V1
EPSS V2 (> 2022-02-04)
EPSS V3 (> 2025-03-07)
EPSS V4 (> 2025-03-17)
2025-10-15
–
–
–
–
0.02%
2025-10-21
–
–
–
–
0.02%
2025-11-01
–
–
–
–
0.02%
2025-11-04
–
–
–
–
0.02%
2025-11-06
–
–
–
–
0.02%
2025-11-18
–
–
–
–
0.02%
2025-11-21
–
–
–
–
0.02%
2025-12-03
–
–
–
–
0.02%
2025-12-04
–
–
–
–
0.02%
2025-12-05
–
–
–
–
0.02%
2025-12-22
–
–
–
–
0.03%
2026-02-22
–
–
–
–
0.03%
2026-03-15
–
–
–
–
0.02%
2026-03-29
–
–
–
–
0.02%
2026-04-26
–
–
–
–
0.02%
2026-05-17
–
–
–
–
0.03%
2026-05-31
–
–
–
–
0.02%
EPSS 백분위수
백분위수는 EPSS 점수에 따라 CVE의 순위를 매기는 데 사용됩니다. 예를 들어 EPSS 점수 기준 95번째 백분위수의 CVE는 다른 CVE의 95%보다 악용될 가능성이 높습니다.