8.8

CVE-2025-38643: linux Improper Locking

CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2025-38643DEBIAN-CVE-2025-38643
Published 22-08-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-38643 is a high (CVSS 8.8) Improper Locking vulnerability in linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.2% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 34 · Related 32
DLA-4499-1DSA-6163-1OPENSUSE-SU-2025:20081-1SUSE-SU-2025:03600-1SUSE-SU-2025:03601-1SUSE-SU-2025:03602-1

Timeline

  1. 22-08-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: Add missing lock in cfg80211_check_and_end_cac() Callers of wdev_chandef() must hold the wiphy mutex. But the worker cfg80211_propagate_cac_done_wk() never takes the lock. Which triggers the warning below with the mesh_peer_connected_dfs test from hostapd and not (yet) released mac80211 code changes: WARNING: CPU: 0 PID: 495 at net/wireless/chan.c:1552 wdev_chandef+0x60/0x165 Modules linked in: CPU: 0 UID: 0 PID: 495 Comm: kworker/u4:2 Not tainted 6.14.0-rc5-wt-g03960e6f9d47 #33 13c287eeabfe1efea01c0bcc863723ab082e17cf Workqueue: cfg80211 cfg80211_propagate_cac_done_wk Stack: 00000000 00000001 ffffff00 6093267c 00000000 6002ec30 6d577c50 60037608 00000000 67e8d108 6063717b 00000000 Call Trace: [<6002ec30>] ? _printk+0x0/0x98 [<6003c2b3>] show_stack+0x10e/0x11a [<6002ec30>] ? _printk+0x0/0x98 [<60037608>] dump_stack_lvl+0x71/0xb8 [<6063717b>] ? wdev_chandef+0x60/0x165 [<6003766d>] dump_stack+0x1e/0x20 [<6005d1b7>] __warn+0x101/0x20f [<6005d3a8>] warn_slowpath_fmt+0xe3/0x15d [<600b0c5c>] ? mark_lock.part.0+0x0/0x4ec [<60751191>] ? __this_cpu_preempt_check+0x0/0x16 [<600b11a2>] ? mark_held_locks+0x5a/0x6e [<6005d2c5>] ? warn_slowpath_fmt+0x0/0x15d [<60052e53>] ? unblock_signals+0x3a/0xe7 [<60052f2d>] ? um_set_signals+0x2d/0x43 [<60751191>] ? __this_cpu_preempt_check+0x0/0x16 [<607508b2>] ? lock_is_held_type+0x207/0x21f [<6063717b>] wdev_chandef+0x60/0x165 [<605f89b4>] regulatory_propagate_dfs_state+0x247/0x43f [<60052f00>] ? um_set_signals+0x0/0x43 [<605e6bfd>] cfg80211_propagate_cac_done_wk+0x3a/0x4a [<6007e460>] process_scheduled_works+0x3bc/0x60e [<6007d0ec>] ? move_linked_works+0x4d/0x81 [<6007d120>] ? assign_work+0x0/0xaa [<6007f81f>] worker_thread+0x220/0x2dc [<600786ef>] ? set_pf_worker+0x0/0x57 [<60087c96>] ? to_kthread+0x0/0x43 [<6008ab3c>] kthread+0x2d3/0x2e2 [<6007f5ff>] ? worker_thread+0x0/0x2dc [<6006c05b>] ? calculate_sigpending+0x0/0x56 [<6003b37d>] new_thread_handler+0x4a/0x64 irq event stamp: 614611 hardirqs last enabled at (614621): [<00000000600bc96b>] __up_console_sem+0x82/0xaf hardirqs last disabled at (614630): [<00000000600bc92c>] __up_console_sem+0x43/0xaf softirqs last enabled at (614268): [<00000000606c55c6>] __ieee80211_wake_queue+0x933/0x985 softirqs last disabled at (614266): [<00000000606c52d6>] __ieee80211_wake_queue+0x643/0x985

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

0.00 pp

From 0.18% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu147 products
  • linuxAll versions (No fix recorded) | < 6.8.0-106.106
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1050.53
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 26ec17a1dc5ecdd8d91aba63ead6f8b5ad5dea0d, < defe9ce121160788547e8e6ec4438ad8a14f40dd | ≥ 26ec17a1dc5ecdd8d91aba63ead6f8b5ad5dea0d, < b3d24038eb775f2f7a1dfef58d8e1dc444a12820 | ≥ 26ec17a1dc5ecdd8d91aba63ead6f8b5ad5dea0d, < 4a63523d3541eef4cf504a9682e6fbe94ffe79a6 | ≥ 26ec17a1dc5ecdd8d91aba63ead6f8b5ad5dea0d, < 7022df2248c08c6f75a01714163ac902333bf3db | ≥ 26ec17a1dc5ecdd8d91aba63ead6f8b5ad5dea0d, < dbce810607726408f889d3358f4780fd1436861e | ≥ 26ec17a1dc5ecdd8d91aba63ead6f8b5ad5dea0d, < 2c5dee15239f3f3e31aa5c8808f18996c039e2c1 | 2dbb6faebb94d6d5ae87e5ea6be9280c366393e1 | a4f85674e4693904ade7cbf6722d0d105d8062d8 | e233cbaf8ecc5859f0417dd53899da4edb477991 | ≥ 4.14.170, < 4.15 | ≥ 4.19.102, < 4.20 | ≥ 5.4.18, < 5.5 | 5.5
  • linux_kernel≥ 4.14.170, < 4.15 | ≥ 4.19.102, < 4.20 | ≥ 5.4.18, < 5.5 | ≥ 5.5.1, < 6.6.118 | ≥ 6.7, < 6.12.57 | ≥ 6.13, < 6.15.10 | ≥ 6.16, < 6.16.1 | 5.5 | 5.5:rc7
Debian1 product
  • linux< 6.1.164-1 | < 6.12.57-1 | < 6.16.3-1

3 vendors · 150 products

References

27 links
Show all 27 references