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CVE-2025-39994— media: tuner: xc5000: Fix use-after-free in xc5000_release

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xc5000_release中使用cancel_delayed_work不当，可能导致释放后重用。

CVSS 7.3 · High EPSS 0.15% · P4

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8< bc4ffd962ce16a154c44c68853b9d93f5b6fc4b8 affected
f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8< e2f5eaafc0306a76fb1cb760aae804b065b8a341 affected
f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8< 3f876cd47ed8bca1e28d68435845949f51f90703 affected
f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8< df0303b4839520b84d9367c2fad65b13650a4d42 affected
f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8< 71ed8b81a4906cb785966910f39cf7f5ad60a69e affected
f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8< effb1c19583bca7022fa641a70766de45c6d41ac affected
f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8< 9a00de20ed8ba90888479749b87bc1532cded4ce affected
f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8< 4266f012806fc18e46da4a04d130df59a4946f93 affected
… +12 more rows
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I. Basic Information for CVE-2025-39994

Vulnerability Information
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Vulnerability Title
media: tuner: xc5000: Fix use-after-free in xc5000_release
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: media: tuner: xc5000: Fix use-after-free in xc5000_release The original code uses cancel_delayed_work() in xc5000_release(), which does not guarantee that the delayed work item timer_sleep has fully completed if it was already running. This leads to use-after-free scenarios where xc5000_release() may free the xc5000_priv while timer_sleep is still active and attempts to dereference the xc5000_priv. A typical race condition is illustrated below: CPU 0 (release thread) | CPU 1 (delayed work callback) xc5000_release() | xc5000_do_timer_sleep() cancel_delayed_work() | hybrid_tuner_release_state(priv) | kfree(priv) | | priv = container_of() // UAF Replace cancel_delayed_work() with cancel_delayed_work_sync() to ensure that the timer_sleep is properly canceled before the xc5000_priv memory is deallocated. A deadlock concern was considered: xc5000_release() is called in a process context and is not holding any locks that the timer_sleep work item might also need. Therefore, the use of the _sync() variant is safe here. This bug was initially identified through static analysis. [hverkuil: fix typo in Subject: tunner -> tuner]
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
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xc5000_release中使用cancel_delayed_work不当，可能导致释放后重用。
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 f7a27ff1fb77e114d1059a5eb2ed1cffdc508ce8 ~ bc4ffd962ce16a154c44c68853b9d93f5b6fc4b8 -
Linux Linux 3.16 -

II. Public POCs for CVE-2025-39994

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III. Intelligence Information for CVE-2025-39994

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Patches & Fixes for CVE-2025-39994 (2)

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 &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39994

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