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CVE-2025-39999— blk-mq: fix blk_mq_tags double free while nr_requests grown

EPSS 0.02% · P7
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I. Basic Information for CVE-2025-39999

Vulnerability Information
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Vulnerability Title
blk-mq: fix blk_mq_tags double free while nr_requests grown
Source: NVD (National Vulnerability Database)
Vulnerability Description
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/
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于blk_mq_tags双重释放，可能导致内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 58567d8e95c096ad234963df90a2ca518901f4b6 ~ 8faee580d63bc2a54a59dcdb7f9ce4de29384fec -
LinuxLinux 6.17 -

II. Public POCs for CVE-2025-39999

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III. Intelligence Information for CVE-2025-39999

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Same Patch Batch · Linux · 2025-10-15 · 34 CVEs total

CVE-2025-39973i40e: add validation for ring_len param
CVE-2025-39981Bluetooth: MGMT: Fix possible UAFs
CVE-2025-39979net/mlx5: fs, fix UAF in flow counter release
CVE-2025-39980nexthop: Forbid FDB status change while nexthop is in a group
CVE-2025-39978octeontx2-pf: Fix potential use after free in otx2_tc_add_flow()
CVE-2025-39977futex: Prevent use-after-free during requeue-PI
CVE-2025-39976futex: Use correct exit on failure from futex_hash_allocate_default()
CVE-2025-39975smb: client: fix wrong index reference in smb2_compound_op()
CVE-2025-39974tracing/osnoise: Fix slab-out-of-bounds in _parse_integer_limit()
CVE-2025-39982Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync
CVE-2025-39972i40e: fix idx validation in i40e_validate_queue_map
CVE-2025-39970i40e: fix input validation logic for action_meta
CVE-2025-39971i40e: fix idx validation in config queues msg
CVE-2025-39969i40e: fix validation of VF state in get resources
CVE-2025-39968i40e: add max boundary check for VF filters
CVE-2025-39967fbcon: fix integer overflow in fbcon_do_set_font
CVE-2025-39966iommufd: Fix race during abort for file descriptors
CVE-2025-40000wifi: rtw89: fix use-after-free in rtw89_core_tx_kick_off_and_wait()
CVE-2025-39984net: tun: Update napi->skb after XDP process
CVE-2025-39983Bluetooth: hci_event: Fix UAF in hci_conn_tx_dequeue

Showing top 20 of 34 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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