UBUNTU-CVE-2025-21811
In the Linux kernel, the following vulnerability has been resolved: nilfs2: protect access to buffers with no active references nilfs_lookup_dirty_data_buffers(), which iterates through the buffers attached to dirty data folios/pages, accesses the attached buffers without locking the folios/pages. For data cache, nilfs_clear_folio_dirty() may be called asynchronously when the file system degenerates to read only, so nilfs_lookup_dirty_data_buffers() still has the potential to cause use after free issues when buffers lose the protection of their dirty state midway due to this asynchronous clearing and are unintentionally freed by try_to_free_buffers(). Eliminate this race issue by adjusting the lock section in this function.
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
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11 explicit affected versions
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2 explicit affected versions
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66 explicit affected versions
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10 explicit affected versions
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16 explicit affected versions
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83 explicit affected versions
13 explicit affected versions
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12 explicit affected versions
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27 explicit affected versions
40 explicit affected versions
1 explicit affected versions
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88 explicit affected versions
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30 explicit affected versions
5 explicit affected versions
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1 explicit affected versions
10 explicit affected versions
4 explicit affected versions
25 explicit affected versions
13 explicit affected versions
96 explicit affected versions
13 explicit affected versions
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10 explicit affected versions
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15 explicit affected versions
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44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
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26 explicit affected versions
45 explicit affected versions
37 explicit affected versions
30 explicit affected versions
14 explicit affected versions
38 explicit affected versions
9 explicit affected versions
55 explicit affected versions
11 explicit affected versions
19 explicit affected versions
7 explicit affected versions
66 explicit affected versions
7 explicit affected versions
35 explicit affected versions
90 explicit affected versions
67 explicit affected versions
134 explicit affected versions
113 explicit affected versions
4 explicit affected versions
1 explicit affected versions
1 explicit affected versions
1 explicit affected versions
64 explicit affected versions
104 explicit affected versions
56 explicit affected versions
13 explicit affected versions
43 explicit affected versions
62 explicit affected versions
137 explicit affected versions
158 explicit affected versions
10 explicit affected versions
8 explicit affected versions
24 explicit affected versions
14 explicit affected versions
92 explicit affected versions
4 explicit affected versions
78 explicit affected versions
11 explicit affected versions
1 explicit affected versions
60 explicit affected versions
19 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: nilfs2: protect access to buffers with no active references nilfs_lookup_dirty_data_buffers(), which iterates through the buffers attached to dirty data folios/pages, accesses the attached buffers without locking the folios/pages. For data cache, nilfs_clear_folio_dirty() may be called asynchronously when the file system degenerates to read only, so nilfs_lookup_dirty_data_buffers() still has the potential to cause use after free issues when buffers lose the protection of their dirty state midway due to this asynchronous clearing and are unintentionally freed by try_to_free_buffers(). Eliminate this race issue by adjusting the lock section in this function.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/367a9bffabe08c04f6d725032cce3d891b2b9e1a
- https://git.kernel.org/stable/c/367a9bffabe08c04f6d725032cce3d891b2b9e1a
- https://git.kernel.org/stable/c/4b08d23d7d1917bef4fbee8ad81372f49b006656
- https://git.kernel.org/stable/c/58c27fa7a610b6e8d44e6220e7dbddfbaccaf439
- https://git.kernel.org/stable/c/8e1b9201c9a24638cf09c6e1c9f224157328010b
- https://git.kernel.org/stable/c/c437dfac9f7a5a46ac2a5e6d6acd3059e9f68188
- https://ubuntu.com/security/CVE-2025-21811
- https://ubuntu.com/security/notices/USN-7510-1
- https://ubuntu.com/security/notices/USN-7510-2
- https://ubuntu.com/security/notices/USN-7510-3
- https://ubuntu.com/security/notices/USN-7510-4
- https://ubuntu.com/security/notices/USN-7510-5
- https://ubuntu.com/security/notices/USN-7510-6
- https://ubuntu.com/security/notices/USN-7510-7
- https://ubuntu.com/security/notices/USN-7510-8
- https://ubuntu.com/security/notices/USN-7511-1
- https://ubuntu.com/security/notices/USN-7511-2
- https://ubuntu.com/security/notices/USN-7511-3
- https://ubuntu.com/security/notices/USN-7512-1
- https://ubuntu.com/security/notices/USN-7516-1
- https://ubuntu.com/security/notices/USN-7516-2
- https://ubuntu.com/security/notices/USN-7516-3
- https://ubuntu.com/security/notices/USN-7516-4
- https://ubuntu.com/security/notices/USN-7516-5
- https://ubuntu.com/security/notices/USN-7516-6
- https://ubuntu.com/security/notices/USN-7516-7
- https://ubuntu.com/security/notices/USN-7516-8
- https://ubuntu.com/security/notices/USN-7516-9
- https://ubuntu.com/security/notices/USN-7517-1
- https://ubuntu.com/security/notices/USN-7517-2
- https://ubuntu.com/security/notices/USN-7517-3
- https://ubuntu.com/security/notices/USN-7518-1
- https://ubuntu.com/security/notices/USN-7521-1
- https://ubuntu.com/security/notices/USN-7521-2
- https://ubuntu.com/security/notices/USN-7521-3
- https://ubuntu.com/security/notices/USN-7539-1
- https://ubuntu.com/security/notices/USN-7540-1
- https://ubuntu.com/security/notices/USN-7593-1
- https://ubuntu.com/security/notices/USN-7602-1
- https://ubuntu.com/security/notices/USN-7640-1
- https://ubuntu.com/security/notices/USN-7651-1
- https://ubuntu.com/security/notices/USN-7651-2
- https://ubuntu.com/security/notices/USN-7651-3
- https://ubuntu.com/security/notices/USN-7651-4
- https://ubuntu.com/security/notices/USN-7651-5
- https://ubuntu.com/security/notices/USN-7651-6
- https://ubuntu.com/security/notices/USN-7652-1
- https://ubuntu.com/security/notices/USN-7653-1
- https://ubuntu.com/security/notices/USN-7737-1
- https://ubuntu.com/security/notices/USN-7907-1
- https://ubuntu.com/security/notices/USN-7907-2
- https://ubuntu.com/security/notices/USN-7907-3
- https://ubuntu.com/security/notices/USN-7907-4
- https://ubuntu.com/security/notices/USN-7907-5
- https://ubuntu.com/security/notices/USN-7930-1
- https://ubuntu.com/security/notices/USN-7930-2
- https://ubuntu.com/security/notices/USN-7937-1
- https://www.cve.org/CVERecord?id=CVE-2025-21811