UBUNTU-CVE-2024-38621
In the Linux kernel, the following vulnerability has been resolved: media: stk1160: fix bounds checking in stk1160_copy_video() The subtract in this condition is reversed. The ->length is the length of the buffer. The ->bytesused is how many bytes we have copied thus far. When the condition is reversed that means the result of the subtraction is always negative but since it's unsigned then the result is a very high positive value. That means the overflow check is never true. Additionally, the ->bytesused doesn't actually work for this purpose because we're not writing to "buf->mem + buf->bytesused". Instead, the math to calculate the destination where we are writing is a bit involved. You calculate the number of full lines already written, multiply by two, skip a line if necessary so that we start on an odd numbered line, and add the offset into the line. To fix this buffer overflow, just take the actual destination where we are writing, if the offset is already out of bounds print an error and return. Otherwise, write up to buf->length bytes.
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
35 explicit affected versions
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35 explicit affected versions
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37 explicit affected versions
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33 explicit affected versions
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11 explicit affected versions
12 explicit affected versions
117 explicit affected versions
7 explicit affected versions
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2 explicit affected versions
42 explicit affected versions
36 explicit affected versions
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10 explicit affected versions
26 explicit affected versions
11 explicit affected versions
29 explicit affected versions
1 explicit affected versions
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13 explicit affected versions
11 explicit affected versions
117 explicit affected versions
53 explicit affected versions
16 explicit affected versions
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3 explicit affected versions
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51 explicit affected versions
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16 explicit affected versions
5 explicit affected versions
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1 explicit affected versions
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13 explicit affected versions
82 explicit affected versions
13 explicit affected versions
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7 explicit affected versions
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46 explicit affected versions
10 explicit affected versions
13 explicit affected versions
12 explicit affected versions
82 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
41 explicit affected versions
37 explicit affected versions
12 explicit affected versions
14 explicit affected versions
38 explicit affected versions
44 explicit affected versions
9 explicit affected versions
44 explicit affected versions
11 explicit affected versions
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4 explicit affected versions
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7 explicit affected versions
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1 explicit affected versions
1 explicit affected versions
50 explicit affected versions
93 explicit affected versions
13 explicit affected versions
43 explicit affected versions
48 explicit affected versions
124 explicit affected versions
144 explicit affected versions
10 explicit affected versions
8 explicit affected versions
7 explicit affected versions
14 explicit affected versions
83 explicit affected versions
4 explicit affected versions
72 explicit affected versions
11 explicit affected versions
1 explicit affected versions
47 explicit affected versions
5 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: media: stk1160: fix bounds checking in stk1160_copy_video() The subtract in this condition is reversed. The ->length is the length of the buffer. The ->bytesused is how many bytes we have copied thus far. When the condition is reversed that means the result of the subtraction is always negative but since it's unsigned then the result is a very high positive value. That means the overflow check is never true. Additionally, the ->bytesused doesn't actually work for this purpose because we're not writing to "buf->mem + buf->bytesused". Instead, the math to calculate the destination where we are writing is a bit involved. You calculate the number of full lines already written, multiply by two, skip a line if necessary so that we start on an odd numbered line, and add the offset into the line. To fix this buffer overflow, just take the actual destination where we are writing, if the offset is already out of bounds print an error and return. Otherwise, write up to buf->length bytes.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/faa4364bef2ec0060de381ff028d1d836600a381
- https://git.kernel.org/stable/c/7532bcec0797adfa08791301c3bcae14141db3bd
- https://git.kernel.org/stable/c/a08492832cc4cacc24e0612f483c86ca899b9261
- https://git.kernel.org/stable/c/a16775828aaed1c54ff4e6fe83e8e4d5c6a50cb7
- https://git.kernel.org/stable/c/b504518a397059e1d55c521ba0ea2b545a6c4b52
- https://git.kernel.org/stable/c/d410017a7181cb55e4a5c810b32b75e4416c6808
- https://git.kernel.org/stable/c/ecf4ddc3aee8ade504c4d36b7b4053ce6093e200
- https://git.kernel.org/stable/c/f6a392266276730bea893b55d12940e32a25f56a
- https://git.kernel.org/stable/c/faa4364bef2ec0060de381ff028d1d836600a381
- https://ubuntu.com/security/CVE-2024-38621
- https://ubuntu.com/security/notices/USN-6951-1
- https://ubuntu.com/security/notices/USN-6951-2
- https://ubuntu.com/security/notices/USN-6951-3
- https://ubuntu.com/security/notices/USN-6951-4
- https://ubuntu.com/security/notices/USN-6953-1
- https://ubuntu.com/security/notices/USN-6979-1
- https://ubuntu.com/security/notices/USN-6999-1
- https://ubuntu.com/security/notices/USN-6999-2
- https://ubuntu.com/security/notices/USN-7004-1
- https://ubuntu.com/security/notices/USN-7005-1
- https://ubuntu.com/security/notices/USN-7005-2
- https://ubuntu.com/security/notices/USN-7007-1
- https://ubuntu.com/security/notices/USN-7007-2
- https://ubuntu.com/security/notices/USN-7007-3
- https://ubuntu.com/security/notices/USN-7008-1
- https://ubuntu.com/security/notices/USN-7009-1
- https://ubuntu.com/security/notices/USN-7009-2
- https://ubuntu.com/security/notices/USN-7019-1
- https://ubuntu.com/security/notices/USN-7029-1
- https://ubuntu.com/security/notices/USN-7069-1
- https://ubuntu.com/security/notices/USN-7069-2
- https://ubuntu.com/security/notices/USN-7110-1
- https://www.cve.org/CVERecord?id=CVE-2024-38621