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CVE-2025-38306— fs/fhandle.c: fix a race in call of has_locked_children()

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has_locked_children中的竞争条件，可能导致空指针取消引用。

CVSS 7.8 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1059.004 · Unix Shell

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 620c266f394932e5decc4b34683a75dfc59dc2f4< 6482c3dccbfb8d20e2856ce67c75856859930b3f affected
620c266f394932e5decc4b34683a75dfc59dc2f4< 287c7d34eedd37af1272dfb3b6e8656f4f026424 affected
620c266f394932e5decc4b34683a75dfc59dc2f4< 1f282cdc1d219c4a557f7009e81bc792820d9d9a affected
6.11 affected
< 6.11 unaffected
6.12.46≤ 6.12.* unaffected
6.15.3≤ 6.15.* unaffected
6.16≤ * unaffected
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I. Basic Information for CVE-2025-38306

Vulnerability Information
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Vulnerability Title
fs/fhandle.c: fix a race in call of has_locked_children()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fs/fhandle.c: fix a race in call of has_locked_children() may_decode_fh() is calling has_locked_children() while holding no locks. That's an oopsable race... The rest of the callers are safe since they are holding namespace_sem and are guaranteed a positive refcount on the mount in question. Rename the current has_locked_children() to __has_locked_children(), make it static and switch the fs/namespace.c users to it. Make has_locked_children() a wrapper for __has_locked_children(), calling the latter under read_seqlock_excl(&mount_lock).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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has_locked_children中的竞争条件，可能导致空指针取消引用。
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 620c266f394932e5decc4b34683a75dfc59dc2f4 ~ 6482c3dccbfb8d20e2856ce67c75856859930b3f -
Linux Linux 6.11 -

II. Public POCs for CVE-2025-38306

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III. Intelligence Information for CVE-2025-38306

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Same Patch Batch · Linux · 2025-07-10 · 84 CVEs total

CVE-2025-38325 9.8 CRITICAL ksmbd: add free_transport ops in ksmbd connection
CVE-2025-38290 8.8 HIGH wifi: ath12k: fix node corruption in ar->arvifs list
CVE-2025-38283 8.8 HIGH hisi_acc_vfio_pci: bugfix live migration function without VF device driver
CVE-2025-38293 8.8 HIGH wifi: ath11k: fix node corruption in ar->arvifs list
CVE-2025-38291 8.8 HIGH wifi: ath12k: Prevent sending WMI commands to firmware during firmware crash
CVE-2025-38292 8.8 HIGH wifi: ath12k: fix invalid access to memory
CVE-2025-38343 8.3 HIGH wifi: mt76: mt7996: drop fragments with multicast or broadcast RA
CVE-2025-38339 7.8 HIGH powerpc/bpf: fix JIT code size calculation of bpf trampoline
CVE-2025-38273 7.8 HIGH net: tipc: fix refcount warning in tipc_aead_encrypt
CVE-2025-38276 7.8 HIGH fs/dax: Fix "don't skip locked entries when scanning entries"
CVE-2025-38333 7.8 HIGH f2fs: fix to bail out in get_new_segment()
CVE-2025-38346 7.8 HIGH ftrace: Fix UAF when lookup kallsym after ftrace disabled
CVE-2025-38270 7.8 HIGH net: drv: netdevsim: don't napi_complete() from netpoll
CVE-2025-38341 7.8 HIGH eth: fbnic: avoid double free when failing to DMA-map FW msg
CVE-2025-38317 7.8 HIGH wifi: ath12k: Fix buffer overflow in debugfs
CVE-2025-38303 7.8 HIGH Bluetooth: eir: Fix possible crashes on eir_create_adv_data
CVE-2025-38278 7.8 HIGH octeontx2-pf: QOS: Refactor TC_HTB_LEAF_DEL_LAST callback
CVE-2025-38321 7.8 HIGH smb: Log an error when close_all_cached_dirs fails
CVE-2025-38287 7.5 HIGH IB/cm: Drop lockdep assert and WARN when freeing old msg
CVE-2025-38331 7.5 HIGH net: ethernet: cortina: Use TOE/TSO on all TCP

Showing top 20 of 84 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38306

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