UBUNTU-CVE-2024-36016
In the Linux kernel, the following vulnerability has been resolved: tty: n_gsm: fix possible out-of-bounds in gsm0_receive() Assuming the following: - side A configures the n_gsm in basic option mode - side B sends the header of a basic option mode frame with data length 1 - side A switches to advanced option mode - side B sends 2 data bytes which exceeds gsm->len Reason: gsm->len is not used in advanced option mode. - side A switches to basic option mode - side B keeps sending until gsm0_receive() writes past gsm->buf Reason: Neither gsm->state nor gsm->len have been reset after reconfiguration. Fix this by changing gsm->count to gsm->len comparison from equal to less than. Also add upper limit checks against the constant MAX_MRU in gsm0_receive() and gsm1_receive() to harden against memory corruption of gsm->len and gsm->mru. All other checks remain as we still need to limit the data according to the user configuration and actual payload size.
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
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50 explicit affected versions
94 explicit affected versions
12 explicit affected versions
33 explicit affected versions
23 explicit affected versions
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11 explicit affected versions
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114 explicit affected versions
7 explicit affected versions
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93 explicit affected versions
2 explicit affected versions
40 explicit affected versions
33 explicit affected versions
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26 explicit affected versions
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52 explicit affected versions
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2 explicit affected versions
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5 explicit affected versions
13 explicit affected versions
82 explicit affected versions
13 explicit affected versions
46 explicit affected versions
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69 explicit affected versions
44 explicit affected versions
10 explicit affected versions
12 explicit affected versions
12 explicit affected versions
81 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
38 explicit affected versions
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9 explicit affected versions
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38 explicit affected versions
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90 explicit affected versions
13 explicit affected versions
43 explicit affected versions
47 explicit affected versions
121 explicit affected versions
141 explicit affected versions
10 explicit affected versions
8 explicit affected versions
4 explicit affected versions
14 explicit affected versions
82 explicit affected versions
4 explicit affected versions
71 explicit affected versions
11 explicit affected versions
1 explicit affected versions
44 explicit affected versions
3 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: tty: n_gsm: fix possible out-of-bounds in gsm0_receive() Assuming the following: - side A configures the n_gsm in basic option mode - side B sends the header of a basic option mode frame with data length 1 - side A switches to advanced option mode - side B sends 2 data bytes which exceeds gsm->len Reason: gsm->len is not used in advanced option mode. - side A switches to basic option mode - side B keeps sending until gsm0_receive() writes past gsm->buf Reason: Neither gsm->state nor gsm->len have been reset after reconfiguration. Fix this by changing gsm->count to gsm->len comparison from equal to less than. Also add upper limit checks against the constant MAX_MRU in gsm0_receive() and gsm1_receive() to harden against memory corruption of gsm->len and gsm->mru. All other checks remain as we still need to limit the data according to the user configuration and actual payload size.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/47388e807f85948eefc403a8a5fdc5b406a65d5a
- https://git.kernel.org/stable/c/47388e807f85948eefc403a8a5fdc5b406a65d5a
- https://ubuntu.com/security/CVE-2024-36016
- https://ubuntu.com/security/notices/USN-6921-1
- https://ubuntu.com/security/notices/USN-6921-2
- https://ubuntu.com/security/notices/USN-6923-1
- https://ubuntu.com/security/notices/USN-6923-2
- https://ubuntu.com/security/notices/USN-6924-1
- https://ubuntu.com/security/notices/USN-6924-2
- https://ubuntu.com/security/notices/USN-6926-1
- https://ubuntu.com/security/notices/USN-6926-2
- https://ubuntu.com/security/notices/USN-6926-3
- https://ubuntu.com/security/notices/USN-6927-1
- https://ubuntu.com/security/notices/USN-6938-1
- https://ubuntu.com/security/notices/USN-6952-1
- https://ubuntu.com/security/notices/USN-6952-2
- https://ubuntu.com/security/notices/USN-6953-1
- https://ubuntu.com/security/notices/USN-6956-1
- https://ubuntu.com/security/notices/USN-6957-1
- https://ubuntu.com/security/notices/USN-6979-1
- https://ubuntu.com/security/notices/USN-7019-1
- https://www.cve.org/CVERecord?id=CVE-2024-36016