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CVE-2025-22035— tracing: Fix use-after-free in print_graph_function_flags during tracer switching

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，该漏洞源于跟踪器切换期间print_graph_function_flags释放后重用。

CVSS 7.8 · High EPSS 0.30% · P22

Affected Version Matrix 30

VendorProduct Version RangeStatus
Linux Linux 05319d707732c728eb721ac616a50e7978eb499a< 42561fe62c3628ea3bc9623f64f047605e98857f affected
b8205dfed68183dc1470e83863c5ded6d7fa30a9< de7b309139f862a44379ecd96e93c9133c69f813 affected
ce6e2b14bc094866d9173db6935da2d752f06d8b< 81a85b12132c8ffe98f5ddbdc185481790aeaa1b affected
2cb0c037c927db4ec928cc927488e52aa359786e< a2cce54c1748216535dda02e185d07a084be837e affected
eecb91b9f98d6427d4af5fdb8f108f52572a39e7< 099ef3385800828b74933a96c117574637c3fb3a affected
eecb91b9f98d6427d4af5fdb8f108f52572a39e7< c85efe6e13743cac6ba4ccf144cb91f44c86231a affected
eecb91b9f98d6427d4af5fdb8f108f52572a39e7< f14752d66056d0c7bffe5092130409417d3baa70 affected
eecb91b9f98d6427d4af5fdb8f108f52572a39e7< 70be951bc01e4a0e10d443f3510bb17426f257fb affected
… +22 more rows
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I. Basic Information for CVE-2025-22035

Vulnerability Information
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Vulnerability Title
tracing: Fix use-after-free in print_graph_function_flags during tracer switching
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix use-after-free in print_graph_function_flags during tracer switching Kairui reported a UAF issue in print_graph_function_flags() during ftrace stress testing [1]. This issue can be reproduced if puting a 'mdelay(10)' after 'mutex_unlock(&trace_types_lock)' in s_start(), and executing the following script: $ echo function_graph > current_tracer $ cat trace > /dev/null & $ sleep 5 # Ensure the 'cat' reaches the 'mdelay(10)' point $ echo timerlat > current_tracer The root cause lies in the two calls to print_graph_function_flags within print_trace_line during each s_show(): * One through 'iter->trace->print_line()'; * Another through 'event->funcs->trace()', which is hidden in print_trace_fmt() before print_trace_line returns. Tracer switching only updates the former, while the latter continues to use the print_line function of the old tracer, which in the script above is print_graph_function_flags. Moreover, when switching from the 'function_graph' tracer to the 'timerlat' tracer, s_start only calls graph_trace_close of the 'function_graph' tracer to free 'iter->private', but does not set it to NULL. This provides an opportunity for 'event->funcs->trace()' to use an invalid 'iter->private'. To fix this issue, set 'iter->private' to NULL immediately after freeing it in graph_trace_close(), ensuring that an invalid pointer is not passed to other tracers. Additionally, clean up the unnecessary 'iter->private = NULL' during each 'cat trace' when using wakeup and irqsoff tracers. [1] https://lore.kernel.org/all/20231112150030.84609-1-ryncsn@gmail.com/
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，该漏洞源于跟踪器切换期间print_graph_function_flags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 05319d707732c728eb721ac616a50e7978eb499a ~ 42561fe62c3628ea3bc9623f64f047605e98857f -
Linux Linux 6.5 -

II. Public POCs for CVE-2025-22035

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III. Intelligence Information for CVE-2025-22035

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Other References for CVE-2025-22035 (7)

Same Patch Batch · Linux · 2025-04-16 · 127 CVEs total

CVE-2025-22021 10.0 CRITICAL netfilter: socket: Lookup orig tuple for IPv6 SNAT
CVE-2025-22077 9.8 CRITICAL Revert "smb: client: fix TCP timers deadlock after rmmod"
CVE-2025-22088 9.8 CRITICAL RDMA/erdma: Prevent use-after-free in erdma_accept_newconn()
CVE-2025-22110 9.8 CRITICAL netfilter: nfnetlink_queue: Initialize ctx to avoid memory allocation error
CVE-2025-22074 8.8 HIGH ksmbd: fix r_count dec/increment mismatch
CVE-2025-22118 8.8 HIGH ice: validate queue quanta parameters to prevent OOB access
CVE-2025-22040 8.8 HIGH ksmbd: fix session use-after-free in multichannel connection
CVE-2025-22041 8.8 HIGH ksmbd: fix use-after-free in ksmbd_sessions_deregister()
CVE-2025-22039 8.8 HIGH ksmbd: fix overflow in dacloffset bounds check
CVE-2024-58096 8.8 HIGH wifi: ath11k: add srng->lock for ath11k_hal_srng_* in monitor mode
CVE-2025-22086 8.8 HIGH RDMA/mlx5: Fix mlx5_poll_one() cur_qp update flow
CVE-2025-23133 8.8 HIGH wifi: ath11k: update channel list in reg notifier instead reg worker
CVE-2025-22117 8.7 HIGH ice: fix using untrusted value of pkt_len in ice_vc_fdir_parse_raw()
CVE-2025-22108 8.6 HIGH bnxt_en: Mask the bd_cnt field in the TX BD properly
CVE-2025-22080 8.4 HIGH fs/ntfs3: Prevent integer overflow in hdr_first_de()
CVE-2025-22121 8.4 HIGH ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()
CVE-2025-22038 8.3 HIGH ksmbd: validate zero num_subauth before sub_auth is accessed
CVE-2025-22042 8.1 HIGH ksmbd: add bounds check for create lease context
CVE-2025-22043 8.1 HIGH ksmbd: add bounds check for durable handle context
CVE-2025-22109 7.8 HIGH ax25: Remove broken autobind

Showing top 20 of 127 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-22035

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