UBUNTU-CVE-2023-34256
An issue was discovered in the Linux kernel before 6.3.3. There is an out-of-bounds read in crc16 in lib/crc16.c when called from fs/ext4/super.c because ext4_group_desc_csum does not properly check an offset. NOTE: this is disputed by third parties because the kernel is not intended to defend against attackers with the stated "When modifying the block device while it is mounted by the filesystem" access.
02 / AFFECTED SOFTWARE
Affected packages
12 explicit affected versions
6 explicit affected versions
36 explicit affected versions
116 explicit affected versions
19 explicit affected versions
27 explicit affected versions
50 explicit affected versions
6 explicit affected versions
22 explicit affected versions
44 explicit affected versions
33 explicit affected versions
22 explicit affected versions
29 explicit affected versions
191 explicit affected versions
7 explicit affected versions
30 explicit affected versions
70 explicit affected versions
58 explicit affected versions
35 explicit affected versions
7 explicit affected versions
18 explicit affected versions
89 explicit affected versions
16 explicit affected versions
72 explicit affected versions
13 explicit affected versions
4 explicit affected versions
23 explicit affected versions
94 explicit affected versions
1 explicit affected versions
1 explicit affected versions
21 explicit affected versions
16 explicit affected versions
3 explicit affected versions
27 explicit affected versions
7 explicit affected versions
12 explicit affected versions
20 explicit affected versions
12 explicit affected versions
7 explicit affected versions
104 explicit affected versions
12 explicit affected versions
75 explicit affected versions
83 explicit affected versions
12 explicit affected versions
2 explicit affected versions
10 explicit affected versions
160 explicit affected versions
37 explicit affected versions
93 explicit affected versions
10 explicit affected versions
1 explicit affected versions
13 explicit affected versions
26 explicit affected versions
13 explicit affected versions
2 explicit affected versions
1 explicit affected versions
29 explicit affected versions
64 explicit affected versions
13 explicit affected versions
33 explicit affected versions
1 explicit affected versions
59 explicit affected versions
32 explicit affected versions
75 explicit affected versions
33 explicit affected versions
23 explicit affected versions
10 explicit affected versions
87 explicit affected versions
11 explicit affected versions
12 explicit affected versions
110 explicit affected versions
7 explicit affected versions
5 explicit affected versions
74 explicit affected versions
2 explicit affected versions
22 explicit affected versions
14 explicit affected versions
103 explicit affected versions
30 explicit affected versions
123 explicit affected versions
10 explicit affected versions
26 explicit affected versions
9 explicit affected versions
110 explicit affected versions
33 explicit affected versions
16 explicit affected versions
33 explicit affected versions
23 explicit affected versions
3 explicit affected versions
64 explicit affected versions
1 explicit affected versions
40 explicit affected versions
51 explicit affected versions
63 explicit affected versions
12 explicit affected versions
22 explicit affected versions
8 explicit affected versions
7 explicit affected versions
1 explicit affected versions
1 explicit affected versions
67 explicit affected versions
8 explicit affected versions
5 explicit affected versions
8 explicit affected versions
1 explicit affected versions
3 explicit affected versions
63 explicit affected versions
13 explicit affected versions
29 explicit affected versions
7 explicit affected versions
65 explicit affected versions
25 explicit affected versions
10 explicit affected versions
6 explicit affected versions
12 explicit affected versions
62 explicit affected versions
44 explicit affected versions
16 explicit affected versions
13 explicit affected versions
26 explicit affected versions
19 explicit affected versions
37 explicit affected versions
38 explicit affected versions
23 explicit affected versions
9 explicit affected versions
23 explicit affected versions
11 explicit affected versions
137 explicit affected versions
30 explicit affected versions
2 explicit affected versions
4 explicit affected versions
70 explicit affected versions
34 explicit affected versions
114 explicit affected versions
93 explicit affected versions
4 explicit affected versions
1 explicit affected versions
28 explicit affected versions
86 explicit affected versions
43 explicit affected versions
29 explicit affected versions
117 explicit affected versions
137 explicit affected versions
10 explicit affected versions
8 explicit affected versions
6 explicit affected versions
63 explicit affected versions
4 explicit affected versions
52 explicit affected versions
1 explicit affected versions
40 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
An issue was discovered in the Linux kernel before 6.3.3. There is an out-of-bounds read in crc16 in lib/crc16.c when called from fs/ext4/super.c because ext4_group_desc_csum does not properly check an offset. NOTE: this is disputed by third parties because the kernel is not intended to defend against attackers with the stated "When modifying the block device while it is mounted by the filesystem" access.
05 / REFERENCES
Further evidence
- https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.3
- https://git.kernel.org/linus/4f04351888a83e595571de672e0a4a8b74f4fb31
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4f04351888a83e595571de672e0a4a8b74f4fb31
- https://syzkaller.appspot.com/bug?extid=8785e41224a3afd04321
- https://ubuntu.com/security/CVE-2023-34256
- https://ubuntu.com/security/notices/USN-6700-1
- https://ubuntu.com/security/notices/USN-6700-2
- https://ubuntu.com/security/notices/USN-6701-1
- https://ubuntu.com/security/notices/USN-6701-2
- https://ubuntu.com/security/notices/USN-6701-3
- https://ubuntu.com/security/notices/USN-6701-4
- https://www.cve.org/CVERecord?id=CVE-2023-34256