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CVE-2025-39689— ftrace: Also allocate and copy hash for reading of filter files

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ftrace模块在读取过滤器文件时未分配和复制哈希表。

CVSS 7.8 · High EPSS 0.18% · P8

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c20489dad156dd9919ebd854bbace46dbd2576a3< 12064e1880fc9202be75ff668205b1703d92f74f affected
c20489dad156dd9919ebd854bbace46dbd2576a3< c4cd93811e038d19f961985735ef7bb128078dfb affected
c20489dad156dd9919ebd854bbace46dbd2576a3< e0b6b223167e1edde5c82edf38e393c06eda1f13 affected
c20489dad156dd9919ebd854bbace46dbd2576a3< a40c69f4f1ed96acbcd62e9b5ff3a596f0a91309 affected
c20489dad156dd9919ebd854bbace46dbd2576a3< 3b114a3282ab1a12cb4618a8f45db5d7185e784a affected
c20489dad156dd9919ebd854bbace46dbd2576a3< c591ba1acd081d4980713e47869dd1cc3d963d19 affected
c20489dad156dd9919ebd854bbace46dbd2576a3< 64db338140d2bad99a0a8c6a118dd60b3e1fb8cb affected
c20489dad156dd9919ebd854bbace46dbd2576a3< bfb336cf97df7b37b2b2edec0f69773e06d11955 affected
… +10 more rows
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I. Basic Information for CVE-2025-39689

Vulnerability Information
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Vulnerability Title
ftrace: Also allocate and copy hash for reading of filter files
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ftrace: Also allocate and copy hash for reading of filter files Currently the reader of set_ftrace_filter and set_ftrace_notrace just adds the pointer to the global tracer hash to its iterator. Unlike the writer that allocates a copy of the hash, the reader keeps the pointer to the filter hashes. This is problematic because this pointer is static across function calls that release the locks that can update the global tracer hashes. This can cause UAF and similar bugs. Allocate and copy the hash for reading the filter files like it is done for the writers. This not only fixes UAF bugs, but also makes the code a bit simpler as it doesn't have to differentiate when to free the iterator's hash between writers and readers.
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ftrace模块在读取过滤器文件时未分配和复制哈希表。
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 c20489dad156dd9919ebd854bbace46dbd2576a3 ~ 12064e1880fc9202be75ff668205b1703d92f74f -
Linux Linux 4.12 -

II. Public POCs for CVE-2025-39689

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III. Intelligence Information for CVE-2025-39689

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Same Patch Batch · Linux · 2025-09-05 · 60 CVEs total

CVE-2025-39726 9.8 CRITICAL s390/ism: fix concurrency management in ism_cmd()
CVE-2025-39682 9.8 CRITICAL tls: fix handling of zero-length records on the rx_list
CVE-2025-38734 9.8 CRITICAL net/smc: fix UAF on smcsk after smc_listen_out()
CVE-2025-39702 9.8 CRITICAL ipv6: sr: Fix MAC comparison to be constant-time
CVE-2025-39703 9.8 CRITICAL net, hsr: reject HSR frame if skb can't hold tag
CVE-2025-38737 9.8 CRITICAL cifs: Fix oops due to uninitialised variable
CVE-2025-39673 9.8 CRITICAL ppp: fix race conditions in ppp_fill_forward_path
CVE-2025-39704 8.8 HIGH LoongArch: KVM: Fix stack protector issue in send_ipi_data()
CVE-2025-39718 8.4 HIGH vsock/virtio: Validate length in packet header before skb_put()
CVE-2025-39711 7.8 HIGH media: ivsc: Fix crash at shutdown due to missing mei_cldev_disable() calls
CVE-2025-39710 7.8 HIGH media: venus: Add a check for packet size after reading from shared memory
CVE-2025-39697 7.8 HIGH NFS: Fix a race when updating an existing write
CVE-2025-39714 7.8 HIGH media: usbtv: Lock resolution while streaming
CVE-2025-39717 7.8 HIGH open_tree_attr: do not allow id-mapping changes without OPEN_TREE_CLONE
CVE-2025-39698 7.8 HIGH io_uring/futex: ensure io_futex_wait() cleans up properly on failure
CVE-2025-38731 7.8 HIGH drm/xe: Fix vm_bind_ioctl double free bug
CVE-2025-39696 7.8 HIGH ALSA: hda: tas2781: Fix wrong reference of tasdevice_priv
CVE-2025-39691 7.8 HIGH fs/buffer: fix use-after-free when call bh_read() helper
CVE-2025-38733 7.8 HIGH s390/mm: Do not map lowcore with identity mapping
CVE-2025-39680 7.8 HIGH i2c: rtl9300: Fix out-of-bounds bug in rtl9300_i2c_smbus_xfer

Showing top 20 of 60 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39689

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