UBUNTU-CVE-2025-39698
In the Linux kernel, the following vulnerability has been resolved: io_uring/futex: ensure io_futex_wait() cleans up properly on failure The io_futex_data is allocated upfront and assigned to the io_kiocb async_data field, but the request isn't marked with REQ_F_ASYNC_DATA at that point. Those two should always go together, as the flag tells io_uring whether the field is valid or not. Additionally, on failure cleanup, the futex handler frees the data but does not clear ->async_data. Clear the data and the flag in the error path as well. Thanks to Trend Micro Zero Day Initiative and particularly ReDress for reporting this.
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
50 explicit affected versions
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44 explicit affected versions
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10 explicit affected versions
6 explicit affected versions
24 explicit affected versions
10 explicit affected versions
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26 explicit affected versions
7 explicit affected versions
31 explicit affected versions
13 explicit affected versions
34 explicit affected versions
35 explicit affected versions
18 explicit affected versions
36 explicit affected versions
13 explicit affected versions
4 explicit affected versions
23 explicit affected versions
42 explicit affected versions
1 explicit affected versions
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9 explicit affected versions
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10 explicit affected versions
38 explicit affected versions
8 explicit affected versions
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12 explicit affected versions
11 explicit affected versions
7 explicit affected versions
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10 explicit affected versions
1 explicit affected versions
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12 explicit affected versions
31 explicit affected versions
16 explicit affected versions
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24 explicit affected versions
10 explicit affected versions
37 explicit affected versions
10 explicit affected versions
13 explicit affected versions
30 explicit affected versions
3 explicit affected versions
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26 explicit affected versions
3 explicit affected versions
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13 explicit affected versions
12 explicit affected versions
31 explicit affected versions
31 explicit affected versions
33 explicit affected versions
3 explicit affected versions
23 explicit affected versions
10 explicit affected versions
10 explicit affected versions
9 explicit affected versions
11 explicit affected versions
5 explicit affected versions
12 explicit affected versions
7 explicit affected versions
12 explicit affected versions
5 explicit affected versions
10 explicit affected versions
26 explicit affected versions
13 explicit affected versions
31 explicit affected versions
25 explicit affected versions
37 explicit affected versions
11 explicit affected versions
13 explicit affected versions
36 explicit affected versions
16 explicit affected versions
40 explicit affected versions
3 explicit affected versions
7 explicit affected versions
51 explicit affected versions
18 explicit affected versions
32 explicit affected versions
12 explicit affected versions
27 explicit affected versions
33 explicit affected versions
8 explicit affected versions
5 explicit affected versions
3 explicit affected versions
8 explicit affected versions
10 explicit affected versions
7 explicit affected versions
36 explicit affected versions
13 explicit affected versions
13 explicit affected versions
7 explicit affected versions
8 explicit affected versions
10 explicit affected versions
26 explicit affected versions
12 explicit affected versions
45 explicit affected versions
37 explicit affected versions
41 explicit affected versions
14 explicit affected versions
38 explicit affected versions
9 explicit affected versions
11 explicit affected versions
29 explicit affected versions
12 explicit affected versions
8 explicit affected versions
7 explicit affected versions
4 explicit affected versions
1 explicit affected versions
13 explicit affected versions
43 explicit affected versions
10 explicit affected versions
8 explicit affected versions
35 explicit affected versions
14 explicit affected versions
4 explicit affected versions
78 explicit affected versions
11 explicit affected versions
1 explicit affected versions
9 explicit affected versions
29 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: io_uring/futex: ensure io_futex_wait() cleans up properly on failure The io_futex_data is allocated upfront and assigned to the io_kiocb async_data field, but the request isn't marked with REQ_F_ASYNC_DATA at that point. Those two should always go together, as the flag tells io_uring whether the field is valid or not. Additionally, on failure cleanup, the futex handler frees the data but does not clear ->async_data. Clear the data and the flag in the error path as well. Thanks to Trend Micro Zero Day Initiative and particularly ReDress for reporting this.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/508c1314b342b78591f51c4b5dadee31a88335df
- https://git.kernel.org/stable/c/508c1314b342b78591f51c4b5dadee31a88335df
- https://git.kernel.org/stable/c/d34c04152df517c59979b4bf2a47f491e06d3256
- https://git.kernel.org/stable/c/d9f93172820a53ab42c4b0e5e65291f4f9d00ad2
- https://ubuntu.com/security/CVE-2025-39698
- https://ubuntu.com/security/notices/USN-8015-1
- https://ubuntu.com/security/notices/USN-8015-2
- https://ubuntu.com/security/notices/USN-8015-3
- https://ubuntu.com/security/notices/USN-8015-4
- https://ubuntu.com/security/notices/USN-8015-5
- https://ubuntu.com/security/notices/USN-8016-1
- https://ubuntu.com/security/notices/USN-8074-1
- https://ubuntu.com/security/notices/USN-8074-2
- https://ubuntu.com/security/notices/USN-8126-1
- https://www.cve.org/CVERecord?id=CVE-2025-39698