CVE-2025-39999— blk-mq: fix blk_mq_tags double free while nr_requests grown
Possible ATT&CK Techniques 1AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 9
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 58567d8e95c096ad234963df90a2ca518901f4b6< 8faee580d63bc2a54a59dcdb7f9ce4de29384fec | affected |
f5a6604f7a4405450e4a1f54e5430f47290c500f< 392b1d64911f4de8887fe8b68299fa8bd6e5b923 | affected | ||
f5a6604f7a4405450e4a1f54e5430f47290c500f< ba28afbd9eff2a6370f23ef4e6a036ab0cfda409 | affected | ||
6.16.4< 6.16.11 | affected | ||
6.17 | affected | ||
< 6.17 | unaffected | ||
6.16.11≤ 6.16.* | unaffected | ||
6.17.1≤ 6.17.* | unaffected | ||
| … +1 more rows | |||
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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
II. Public POCs for CVE-2025-39999
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Linux · 2025-10-15 · 34 CVEs total
| CVE-2025-39975 | 9.8 CRITICAL | smb: client: fix wrong index reference in smb2_compound_op() |
| CVE-2025-40000 | 8.8 HIGH | wifi: rtw89: fix use-after-free in rtw89_core_tx_kick_off_and_wait() |
| CVE-2025-39969 | 8.8 HIGH | i40e: fix validation of VF state in get resources |
| CVE-2025-39971 | 8.8 HIGH | i40e: fix idx validation in config queues msg |
| CVE-2025-39970 | 8.8 HIGH | i40e: fix input validation logic for action_meta |
| CVE-2025-39972 | 8.8 HIGH | i40e: fix idx validation in i40e_validate_queue_map |
| CVE-2025-39973 | 8.8 HIGH | i40e: add validation for ring_len param |
| CVE-2025-39983 | 8.8 HIGH | Bluetooth: hci_event: Fix UAF in hci_conn_tx_dequeue |
| CVE-2025-39982 | 8.8 HIGH | Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync |
| CVE-2025-39966 | 7.8 HIGH | iommufd: Fix race during abort for file descriptors |
| CVE-2025-39967 | 7.8 HIGH | fbcon: fix integer overflow in fbcon_do_set_font |
| CVE-2025-39976 | 7.8 HIGH | futex: Use correct exit on failure from futex_hash_allocate_default() |
| CVE-2025-39977 | 7.8 HIGH | futex: Prevent use-after-free during requeue-PI |
| CVE-2025-39978 | 7.8 HIGH | octeontx2-pf: Fix potential use after free in otx2_tc_add_flow() |
| CVE-2025-39979 | 7.8 HIGH | net/mlx5: fs, fix UAF in flow counter release |
| CVE-2025-39981 | 7.8 HIGH | Bluetooth: MGMT: Fix possible UAFs |
| CVE-2025-39985 | 7.8 HIGH | can: mcba_usb: populate ndo_change_mtu() to prevent buffer overflow |
| CVE-2025-39986 | 7.8 HIGH | can: sun4i_can: populate ndo_change_mtu() to prevent buffer overflow |
| CVE-2025-39987 | 7.8 HIGH | can: hi311x: populate ndo_change_mtu() to prevent buffer overflow |
| CVE-2025-39988 | 7.8 HIGH | can: etas_es58x: populate ndo_change_mtu() to prevent buffer overflow |
Showing top 20 of 34 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev - CVE-2026-74575
thunderbolt: Prevent XDomain delayed work use-after-free on - CVE-2026-74573
iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for
Same vendor: Linux
- CVE-2026-74577
net: mpls: initialize rtm_tos in mpls_getroute() - CVE-2026-74576
mm/slab: prevent unbounded recursion in free path with new k - CVE-2026-74574
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev - CVE-2026-74575
thunderbolt: Prevent XDomain delayed work use-after-free on - CVE-2026-74573
iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for
V. Comments for CVE-2025-39999
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