UBUNTU-CVE-2026-46195
In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building DACL pointers parse_sec_desc(), build_sec_desc(), and the chown path in id_mode_to_cifs_acl() all add the server-supplied dacloffset to pntsd before proving a DACL header fits inside the returned security descriptor. On 32-bit builds a malicious server can return dacloffset near U32_MAX, wrap the derived DACL pointer below end_of_acl, and then slip past the later pointer-based bounds checks. build_sec_desc() and id_mode_to_cifs_acl() can then dereference DACL fields from the wrapped pointer in the chmod/chown rewrite paths. Validate dacloffset numerically before building any DACL pointer and reuse the same helper at the three DACL entry points.
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
4 explicit affected versions
86 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
96 explicit affected versions
58 explicit affected versions
24 explicit affected versions
1 explicit affected versions
81 explicit affected versions
82 explicit affected versions
83 explicit affected versions
75 explicit affected versions
10 explicit affected versions
36 explicit affected versions
26 explicit affected versions
88 explicit affected versions
7 explicit affected versions
83 explicit affected versions
39 explicit affected versions
13 explicit affected versions
43 explicit affected versions
35 explicit affected versions
1 explicit affected versions
48 explicit affected versions
46 explicit affected versions
18 explicit affected versions
39 explicit affected versions
64 explicit affected versions
44 explicit affected versions
13 explicit affected versions
4 explicit affected versions
23 explicit affected versions
51 explicit affected versions
1 explicit affected versions
21 explicit affected versions
7 explicit affected versions
16 explicit affected versions
10 explicit affected versions
19 explicit affected versions
6 explicit affected versions
47 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
16 explicit affected versions
12 explicit affected versions
7 explicit affected versions
12 explicit affected versions
40 explicit affected versions
8 explicit affected versions
8 explicit affected versions
42 explicit affected versions
16 explicit affected versions
5 explicit affected versions
16 explicit affected versions
27 explicit affected versions
33 explicit affected versions
10 explicit affected versions
37 explicit affected versions
10 explicit affected versions
8 explicit affected versions
13 explicit affected versions
38 explicit affected versions
3 explicit affected versions
10 explicit affected versions
11 explicit affected versions
64 explicit affected versions
26 explicit affected versions
9 explicit affected versions
13 explicit affected versions
33 explicit affected versions
29 explicit affected versions
13 explicit affected versions
12 explicit affected versions
94 explicit affected versions
40 explicit affected versions
39 explicit affected versions
8 explicit affected versions
88 explicit affected versions
51 explicit affected versions
33 explicit affected versions
23 explicit affected versions
57 explicit affected versions
10 explicit affected versions
19 explicit affected versions
18 explicit affected versions
11 explicit affected versions
5 explicit affected versions
12 explicit affected versions
8 explicit affected versions
7 explicit affected versions
12 explicit affected versions
7 explicit affected versions
16 explicit affected versions
16 explicit affected versions
5 explicit affected versions
73 explicit affected versions
89 explicit affected versions
10 explicit affected versions
26 explicit affected versions
39 explicit affected versions
1 explicit affected versions
65 explicit affected versions
35 explicit affected versions
46 explicit affected versions
11 explicit affected versions
8 explicit affected versions
13 explicit affected versions
45 explicit affected versions
16 explicit affected versions
87 explicit affected versions
49 explicit affected versions
10 explicit affected versions
3 explicit affected versions
7 explicit affected versions
2 explicit affected versions
14 explicit affected versions
51 explicit affected versions
15 explicit affected versions
18 explicit affected versions
41 explicit affected versions
12 explicit affected versions
69 explicit affected versions
76 explicit affected versions
5 explicit affected versions
27 explicit affected versions
62 explicit affected versions
7 explicit affected versions
42 explicit affected versions
8 explicit affected versions
53 explicit affected versions
5 explicit affected versions
8 explicit affected versions
5 explicit affected versions
10 explicit affected versions
7 explicit affected versions
45 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
35 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
49 explicit affected versions
14 explicit affected versions
38 explicit affected versions
9 explicit affected versions
16 explicit affected versions
11 explicit affected versions
38 explicit affected versions
17 explicit affected versions
13 explicit affected versions
89 explicit affected versions
6 explicit affected versions
7 explicit affected versions
4 explicit affected versions
78 explicit affected versions
8 explicit affected versions
1 explicit affected versions
1 explicit affected versions
1 explicit affected versions
87 explicit affected versions
77 explicit affected versions
77 explicit affected versions
6 explicit affected versions
13 explicit affected versions
43 explicit affected versions
13 explicit affected versions
10 explicit affected versions
8 explicit affected versions
44 explicit affected versions
14 explicit affected versions
4 explicit affected versions
78 explicit affected versions
13 explicit affected versions
11 explicit affected versions
1 explicit affected versions
18 explicit affected versions
3 explicit affected versions
38 explicit affected versions
76 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building DACL pointers parse_sec_desc(), build_sec_desc(), and the chown path in id_mode_to_cifs_acl() all add the server-supplied dacloffset to pntsd before proving a DACL header fits inside the returned security descriptor. On 32-bit builds a malicious server can return dacloffset near U32_MAX, wrap the derived DACL pointer below end_of_acl, and then slip past the later pointer-based bounds checks. build_sec_desc() and id_mode_to_cifs_acl() can then dereference DACL fields from the wrapped pointer in the chmod/chown rewrite paths. Validate dacloffset numerically before building any DACL pointer and reuse the same helper at the three DACL entry points.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/f98b48151cc502ada59d9778f0112d21f2586ca3
- https://git.kernel.org/stable/c/3b1ddba19e77ee35241cd27f16dc3e8d14e08db7
- https://git.kernel.org/stable/c/8bd07e417b6bda67e317920584e48cb6ee442a8a
- https://git.kernel.org/stable/c/ba7f71b6161c0943dafc367565e5843d16b7d505
- https://git.kernel.org/stable/c/c688f3ed73d31943334ad2139cb02ec49664322a
- https://git.kernel.org/stable/c/f98b48151cc502ada59d9778f0112d21f2586ca3
- https://ubuntu.com/security/CVE-2026-46195
- https://ubuntu.com/security/notices/USN-8488-1
- https://ubuntu.com/security/notices/USN-8488-2
- https://ubuntu.com/security/notices/USN-8489-1
- https://ubuntu.com/security/notices/USN-8490-1
- https://ubuntu.com/security/notices/USN-8490-2
- https://ubuntu.com/security/notices/USN-8491-1
- https://ubuntu.com/security/notices/USN-8492-1
- https://ubuntu.com/security/notices/USN-8492-2
- https://ubuntu.com/security/notices/USN-8492-3
- https://ubuntu.com/security/notices/USN-8492-4
- https://ubuntu.com/security/notices/USN-8492-5
- https://ubuntu.com/security/notices/USN-8493-1
- https://ubuntu.com/security/notices/USN-8493-2
- https://ubuntu.com/security/notices/USN-8497-1
- https://ubuntu.com/security/notices/USN-8498-1
- https://ubuntu.com/security/notices/USN-8499-1
- https://ubuntu.com/security/notices/USN-8507-1
- https://ubuntu.com/security/notices/USN-8508-1
- https://ubuntu.com/security/notices/USN-8527-1
- https://ubuntu.com/security/notices/USN-8528-1
- https://ubuntu.com/security/notices/USN-8545-1
- https://ubuntu.com/security/notices/USN-8546-1
- https://ubuntu.com/security/notices/USN-8547-1
- https://ubuntu.com/security/notices/USN-8547-2
- https://ubuntu.com/security/notices/USN-8569-1
- https://ubuntu.com/security/notices/USN-8603-1
- https://ubuntu.com/security/notices/USN-8604-1
- https://ubuntu.com/security/notices/USN-8605-1
- https://ubuntu.com/security/notices/USN-8606-1
- https://ubuntu.com/security/notices/USN-8607-1
- https://ubuntu.com/security/notices/USN-8609-1
- https://ubuntu.com/security/notices/USN-8619-1
- https://www.cve.org/CVERecord?id=CVE-2026-46195