UBUNTU-CVE-2025-22035
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/[email protected]/
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
39 explicit affected versions
105 explicit affected versions
65 explicit affected versions
50 explicit affected versions
6 explicit affected versions
12 explicit affected versions
19 explicit affected versions
6 explicit affected versions
75 explicit affected versions
24 explicit affected versions
60 explicit affected versions
60 explicit affected versions
77 explicit affected versions
68 explicit affected versions
55 explicit affected versions
10 explicit affected versions
23 explicit affected versions
26 explicit affected versions
67 explicit affected versions
7 explicit affected versions
66 explicit affected versions
27 explicit affected versions
13 explicit affected versions
30 explicit affected versions
35 explicit affected versions
27 explicit affected versions
25 explicit affected versions
18 explicit affected versions
26 explicit affected versions
64 explicit affected versions
32 explicit affected versions
107 explicit affected versions
13 explicit affected versions
4 explicit affected versions
23 explicit affected versions
38 explicit affected versions
110 explicit affected versions
1 explicit affected versions
21 explicit affected versions
16 explicit affected versions
10 explicit affected versions
61 explicit affected versions
34 explicit affected versions
6 explicit affected versions
7 explicit affected versions
12 explicit affected versions
6 explicit affected versions
12 explicit affected versions
14 explicit affected versions
10 explicit affected versions
1 explicit affected versions
7 explicit affected versions
5 explicit affected versions
94 explicit affected versions
12 explicit affected versions
93 explicit affected versions
12 explicit affected versions
27 explicit affected versions
21 explicit affected versions
21 explicit affected versions
20 explicit affected versions
10 explicit affected versions
37 explicit affected versions
8 explicit affected versions
13 explicit affected versions
26 explicit affected versions
10 explicit affected versions
42 explicit affected versions
26 explicit affected versions
2 explicit affected versions
13 explicit affected versions
14 explicit affected versions
29 explicit affected versions
97 explicit affected versions
13 explicit affected versions
72 explicit affected versions
27 explicit affected versions
27 explicit affected versions
88 explicit affected versions
67 explicit affected versions
30 explicit affected versions
33 explicit affected versions
23 explicit affected versions
36 explicit affected versions
10 explicit affected versions
6 explicit affected versions
5 explicit affected versions
11 explicit affected versions
12 explicit affected versions
7 explicit affected versions
12 explicit affected versions
52 explicit affected versions
68 explicit affected versions
10 explicit affected versions
26 explicit affected versions
28 explicit affected versions
1 explicit affected versions
46 explicit affected versions
21 explicit affected versions
33 explicit affected versions
13 explicit affected versions
32 explicit affected versions
65 explicit affected versions
16 explicit affected versions
69 explicit affected versions
36 explicit affected versions
3 explicit affected versions
118 explicit affected versions
5 explicit affected versions
2 explicit affected versions
51 explicit affected versions
15 explicit affected versions
28 explicit affected versions
12 explicit affected versions
58 explicit affected versions
55 explicit affected versions
27 explicit affected versions
42 explicit affected versions
108 explicit affected versions
29 explicit affected versions
8 explicit affected versions
32 explicit affected versions
5 explicit affected versions
3 explicit affected versions
8 explicit affected versions
10 explicit affected versions
5 explicit affected versions
32 explicit affected versions
13 explicit affected versions
97 explicit affected versions
13 explicit affected versions
61 explicit affected versions
7 explicit affected versions
5 explicit affected versions
10 explicit affected versions
12 explicit affected versions
15 explicit affected versions
95 explicit affected versions
68 explicit affected versions
42 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
45 explicit affected versions
37 explicit affected versions
37 explicit affected versions
14 explicit affected versions
38 explicit affected versions
9 explicit affected versions
11 explicit affected versions
25 explicit affected versions
8 explicit affected versions
68 explicit affected versions
7 explicit affected versions
4 explicit affected versions
57 explicit affected versions
1 explicit affected versions
1 explicit affected versions
66 explicit affected versions
56 explicit affected versions
56 explicit affected versions
13 explicit affected versions
43 explicit affected versions
63 explicit affected versions
105 explicit affected versions
10 explicit affected versions
8 explicit affected versions
31 explicit affected versions
75 explicit affected versions
14 explicit affected versions
4 explicit affected versions
78 explicit affected versions
11 explicit affected versions
1 explicit affected versions
109 explicit affected versions
5 explicit affected versions
25 explicit affected versions
57 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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/[email protected]/
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/7f81f27b1093e4895e87b74143c59c055c3b1906
- https://git.kernel.org/stable/c/099ef3385800828b74933a96c117574637c3fb3a
- https://git.kernel.org/stable/c/42561fe62c3628ea3bc9623f64f047605e98857f
- https://git.kernel.org/stable/c/70be951bc01e4a0e10d443f3510bb17426f257fb
- https://git.kernel.org/stable/c/7f81f27b1093e4895e87b74143c59c055c3b1906
- https://git.kernel.org/stable/c/81a85b12132c8ffe98f5ddbdc185481790aeaa1b
- https://git.kernel.org/stable/c/a2cce54c1748216535dda02e185d07a084be837e
- https://git.kernel.org/stable/c/c85efe6e13743cac6ba4ccf144cb91f44c86231a
- https://git.kernel.org/stable/c/de7b309139f862a44379ecd96e93c9133c69f813
- https://git.kernel.org/stable/c/f14752d66056d0c7bffe5092130409417d3baa70
- https://ubuntu.com/security/CVE-2025-22035
- https://ubuntu.com/security/notices/USN-7585-1
- https://ubuntu.com/security/notices/USN-7585-2
- https://ubuntu.com/security/notices/USN-7585-3
- https://ubuntu.com/security/notices/USN-7585-4
- https://ubuntu.com/security/notices/USN-7585-5
- https://ubuntu.com/security/notices/USN-7585-6
- https://ubuntu.com/security/notices/USN-7585-7
- https://ubuntu.com/security/notices/USN-7591-1
- https://ubuntu.com/security/notices/USN-7591-2
- https://ubuntu.com/security/notices/USN-7591-3
- https://ubuntu.com/security/notices/USN-7591-4
- https://ubuntu.com/security/notices/USN-7591-5
- https://ubuntu.com/security/notices/USN-7591-6
- https://ubuntu.com/security/notices/USN-7592-1
- https://ubuntu.com/security/notices/USN-7593-1
- https://ubuntu.com/security/notices/USN-7594-1
- https://ubuntu.com/security/notices/USN-7594-2
- https://ubuntu.com/security/notices/USN-7594-3
- https://ubuntu.com/security/notices/USN-7597-1
- https://ubuntu.com/security/notices/USN-7597-2
- https://ubuntu.com/security/notices/USN-7598-1
- https://ubuntu.com/security/notices/USN-7602-1
- https://ubuntu.com/security/notices/USN-7605-1
- https://ubuntu.com/security/notices/USN-7605-2
- https://ubuntu.com/security/notices/USN-7606-1
- https://ubuntu.com/security/notices/USN-7628-1
- https://ubuntu.com/security/notices/USN-7640-1
- https://ubuntu.com/security/notices/USN-7655-1
- https://ubuntu.com/security/notices/USN-7835-1
- https://ubuntu.com/security/notices/USN-7835-2
- https://ubuntu.com/security/notices/USN-7835-3
- https://ubuntu.com/security/notices/USN-7835-4
- https://ubuntu.com/security/notices/USN-7835-5
- https://ubuntu.com/security/notices/USN-7835-6
- https://ubuntu.com/security/notices/USN-7887-1
- https://ubuntu.com/security/notices/USN-7887-2
- https://ubuntu.com/security/notices/USN-7940-1
- https://ubuntu.com/security/notices/USN-7940-2
- https://www.cve.org/CVERecord?id=CVE-2025-22035