UBUNTU-CVE-2025-40272
In the Linux kernel, the following vulnerability has been resolved: mm/secretmem: fix use-after-free race in fault handler When a page fault occurs in a secret memory file created with `memfd_secret(2)`, the kernel will allocate a new folio for it, mark the underlying page as not-present in the direct map, and add it to the file mapping. If two tasks cause a fault in the same page concurrently, both could end up allocating a folio and removing the page from the direct map, but only one would succeed in adding the folio to the file mapping. The task that failed undoes the effects of its attempt by (a) freeing the folio again and (b) putting the page back into the direct map. However, by doing these two operations in this order, the page becomes available to the allocator again before it is placed back in the direct mapping. If another task attempts to allocate the page between (a) and (b), and the kernel tries to access it via the direct map, it would result in a supervisor not-present page fault. Fix the ordering to restore the direct map before the folio is freed.
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
80 explicit affected versions
50 explicit affected versions
6 explicit affected versions
12 explicit affected versions
19 explicit affected versions
10 explicit affected versions
6 explicit affected versions
90 explicit affected versions
24 explicit affected versions
75 explicit affected versions
75 explicit affected versions
79 explicit affected versions
70 explicit affected versions
10 explicit affected versions
30 explicit affected versions
26 explicit affected versions
82 explicit affected versions
7 explicit affected versions
77 explicit affected versions
34 explicit affected versions
13 explicit affected versions
37 explicit affected versions
35 explicit affected versions
42 explicit affected versions
40 explicit affected versions
18 explicit affected versions
35 explicit affected versions
64 explicit affected versions
39 explicit affected versions
13 explicit affected versions
4 explicit affected versions
23 explicit affected versions
45 explicit affected versions
1 explicit affected versions
21 explicit affected versions
9 explicit affected versions
16 explicit affected versions
10 explicit affected versions
12 explicit affected versions
41 explicit affected versions
8 explicit affected versions
7 explicit affected versions
12 explicit affected versions
11 explicit affected versions
7 explicit affected versions
12 explicit affected versions
14 explicit affected versions
10 explicit affected versions
1 explicit affected versions
7 explicit affected versions
9 explicit affected versions
12 explicit affected versions
1 explicit affected versions
12 explicit affected versions
34 explicit affected versions
36 explicit affected versions
16 explicit affected versions
9 explicit affected versions
23 explicit affected versions
27 explicit affected versions
10 explicit affected versions
37 explicit affected versions
10 explicit affected versions
1 explicit affected versions
13 explicit affected versions
33 explicit affected versions
3 explicit affected versions
10 explicit affected versions
11 explicit affected versions
57 explicit affected versions
26 explicit affected versions
5 explicit affected versions
13 explicit affected versions
29 explicit affected versions
29 explicit affected versions
13 explicit affected versions
12 explicit affected versions
87 explicit affected versions
34 explicit affected versions
34 explicit affected versions
82 explicit affected versions
45 explicit affected versions
33 explicit affected versions
23 explicit affected versions
51 explicit affected versions
10 explicit affected versions
13 explicit affected versions
12 explicit affected versions
11 explicit affected versions
5 explicit affected versions
12 explicit affected versions
1 explicit affected versions
7 explicit affected versions
12 explicit affected versions
8 explicit affected versions
5 explicit affected versions
67 explicit affected versions
83 explicit affected versions
10 explicit affected versions
26 explicit affected versions
32 explicit affected versions
1 explicit affected versions
59 explicit affected versions
28 explicit affected versions
40 explicit affected versions
11 explicit affected versions
1 explicit affected versions
13 explicit affected versions
39 explicit affected versions
16 explicit affected versions
81 explicit affected versions
43 explicit affected versions
3 explicit affected versions
7 explicit affected versions
2 explicit affected versions
7 explicit affected versions
51 explicit affected versions
8 explicit affected versions
18 explicit affected versions
35 explicit affected versions
12 explicit affected versions
66 explicit affected versions
70 explicit affected versions
1 explicit affected versions
27 explicit affected versions
56 explicit affected versions
36 explicit affected versions
8 explicit affected versions
47 explicit affected versions
5 explicit affected versions
8 explicit affected versions
10 explicit affected versions
7 explicit affected versions
39 explicit affected versions
13 explicit affected versions
13 explicit affected versions
7 explicit affected versions
8 explicit affected versions
10 explicit affected versions
12 explicit affected versions
9 explicit affected versions
30 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
44 explicit affected versions
14 explicit affected versions
38 explicit affected versions
9 explicit affected versions
9 explicit affected versions
11 explicit affected versions
32 explicit affected versions
15 explicit affected versions
6 explicit affected versions
83 explicit affected versions
8 explicit affected versions
7 explicit affected versions
4 explicit affected versions
72 explicit affected versions
1 explicit affected versions
1 explicit affected versions
1 explicit affected versions
81 explicit affected versions
72 explicit affected versions
71 explicit affected versions
13 explicit affected versions
43 explicit affected versions
6 explicit affected versions
10 explicit affected versions
8 explicit affected versions
38 explicit affected versions
14 explicit affected versions
4 explicit affected versions
78 explicit affected versions
6 explicit affected versions
11 explicit affected versions
1 explicit affected versions
12 explicit affected versions
32 explicit affected versions
71 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: mm/secretmem: fix use-after-free race in fault handler When a page fault occurs in a secret memory file created with `memfd_secret(2)`, the kernel will allocate a new folio for it, mark the underlying page as not-present in the direct map, and add it to the file mapping. If two tasks cause a fault in the same page concurrently, both could end up allocating a folio and removing the page from the direct map, but only one would succeed in adding the folio to the file mapping. The task that failed undoes the effects of its attempt by (a) freeing the folio again and (b) putting the page back into the direct map. However, by doing these two operations in this order, the page becomes available to the allocator again before it is placed back in the direct mapping. If another task attempts to allocate the page between (a) and (b), and the kernel tries to access it via the direct map, it would result in a supervisor not-present page fault. Fix the ordering to restore the direct map before the folio is freed.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/6f86d0534fddfbd08687fa0f01479d4226bc3c3d
- https://git.kernel.org/stable/c/1e4643d6628edf9c0047b1f8f5bc574665025acb
- https://git.kernel.org/stable/c/42d486d35a4143cc37fc72ee66edc99d942dd367
- https://git.kernel.org/stable/c/4444767e625da46009fc94a453fd1967b80ba047
- https://git.kernel.org/stable/c/52f2d5cf33de9a8f5e72bbb0ed38282ae0bc4649
- https://git.kernel.org/stable/c/6f86d0534fddfbd08687fa0f01479d4226bc3c3d
- https://git.kernel.org/stable/c/bb1c19636aedae39360e6fdbcaef4f2bcff25785
- https://ubuntu.com/security/CVE-2025-40272
- https://ubuntu.com/security/notices/USN-8029-1
- https://ubuntu.com/security/notices/USN-8029-2
- https://ubuntu.com/security/notices/USN-8029-3
- https://ubuntu.com/security/notices/USN-8030-1
- https://ubuntu.com/security/notices/USN-8048-1
- https://ubuntu.com/security/notices/USN-8095-1
- https://ubuntu.com/security/notices/USN-8095-2
- https://ubuntu.com/security/notices/USN-8095-3
- https://ubuntu.com/security/notices/USN-8095-4
- https://ubuntu.com/security/notices/USN-8095-5
- https://ubuntu.com/security/notices/USN-8096-1
- https://ubuntu.com/security/notices/USN-8096-2
- https://ubuntu.com/security/notices/USN-8096-3
- https://ubuntu.com/security/notices/USN-8096-4
- https://ubuntu.com/security/notices/USN-8096-5
- https://ubuntu.com/security/notices/USN-8100-1
- https://ubuntu.com/security/notices/USN-8116-1
- https://ubuntu.com/security/notices/USN-8125-1
- https://ubuntu.com/security/notices/USN-8126-1
- https://ubuntu.com/security/notices/USN-8141-1
- https://ubuntu.com/security/notices/USN-8163-1
- https://ubuntu.com/security/notices/USN-8163-2
- https://ubuntu.com/security/notices/USN-8165-1
- https://ubuntu.com/security/notices/USN-8243-1
- https://ubuntu.com/security/notices/USN-8261-1
- https://www.cve.org/CVERecord?id=CVE-2025-40272