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CVE-2025-39870— dmaengine: idxd: Fix double free in idxd_setup_wqs()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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idxd_setup_wqs函数中存在双重释放问题，可能导致内存损坏。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 17

VendorProduct Version RangeStatus
Linux Linux d584acdf54f409cb7eae1359ae6c12aaabedeed8< 25e6146c2812487a88f619d5ff6efbdcd5b2bc31 affected
47846211998a9ffb0fcc08092eb95ac783d2b11a< df82c7901513fd0fc738052a8e6a330d92cc8ec9 affected
5fcd392dae6d6aba7dc64ffdbb838ff191315da3< ec5430d090d0b6ace8fefa290fc37e88930017d2 affected
3fd2f4bc010cdfbc07dd21018dc65bd9370eb7a4< 9f0e225635475b2285b966271d5e82cba74295b1 affected
3fd2f4bc010cdfbc07dd21018dc65bd9370eb7a4< 39aaa337449e71a41d4813be0226a722827ba606 affected
ed2c66000aa64c0d2621864831f0d04c820a1441 affected
6.1.140< 6.1.153 affected
6.6.92< 6.6.107 affected
… +9 more rows
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I. Basic Information for CVE-2025-39870

Vulnerability Information
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Vulnerability Title
dmaengine: idxd: Fix double free in idxd_setup_wqs()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Fix double free in idxd_setup_wqs() The clean up in idxd_setup_wqs() has had a couple bugs because the error handling is a bit subtle. It's simpler to just re-write it in a cleaner way. The issues here are: 1) If "idxd->max_wqs" is <= 0 then we call put_device(conf_dev) when "conf_dev" hasn't been initialized. 2) If kzalloc_node() fails then again "conf_dev" is invalid. It's either uninitialized or it points to the "conf_dev" from the previous iteration so it leads to a double free. It's better to free partial loop iterations within the loop and then the unwinding at the end can handle whole loop iterations. I also renamed the labels to describe what the goto does and not where the goto was located.
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idxd_setup_wqs函数中存在双重释放问题，可能导致内存损坏。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux d584acdf54f409cb7eae1359ae6c12aaabedeed8 ~ 25e6146c2812487a88f619d5ff6efbdcd5b2bc31 -
Linux Linux 6.15 -

II. Public POCs for CVE-2025-39870

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III. Intelligence Information for CVE-2025-39870

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Same Patch Batch · Linux · 2025-09-23 · 21 CVEs total

CVE-2025-39880 9.8 CRITICAL libceph: fix invalid accesses to ceph_connection_v1_info
CVE-2025-39869 8.4 HIGH dmaengine: ti: edma: Fix memory allocation size for queue_priority_map
CVE-2025-39882 8.4 HIGH drm/mediatek: fix potential OF node use-after-free
CVE-2025-39868 7.8 HIGH erofs: fix runtime warning on truncate_folio_batch_exceptionals()
CVE-2025-39872 7.8 HIGH hsr: hold rcu and dev lock for hsr_get_port_ndev
CVE-2025-39873 7.8 HIGH can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB
CVE-2025-39888 7.8 HIGH fuse: Block access to folio overlimit
CVE-2025-39881 7.8 HIGH kernfs: Fix UAF in polling when open file is released
CVE-2025-39887 tracing/osnoise: Fix null-ptr-deref in bitmap_parselist()
CVE-2025-39885 ocfs2: fix recursive semaphore deadlock in fiemap call
CVE-2025-39886 bpf: Tell memcg to use allow_spinning=false path in bpf_timer_init()
CVE-2025-39883 mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory
CVE-2025-39884 btrfs: fix subvolume deletion lockup caused by inodes xarray race
CVE-2025-39878 ceph: fix crash after fscrypt_encrypt_pagecache_blocks() error
CVE-2025-39879 ceph: always call ceph_shift_unused_folios_left()
CVE-2025-39877 mm/damon/sysfs: fix use-after-free in state_show()
CVE-2025-39876 net: fec: Fix possible NPD in fec_enet_phy_reset_after_clk_enable()
CVE-2025-39874 macsec: sync features on RTM_NEWLINK
CVE-2025-39875 igb: Fix NULL pointer dereference in ethtool loopback test
CVE-2025-39871 dmaengine: idxd: Remove improper idxd_free

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39870

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