UBUNTU-CVE-2024-35982
In the Linux kernel, the following vulnerability has been resolved: batman-adv: Avoid infinite loop trying to resize local TT If the MTU of one of an attached interface becomes too small to transmit the local translation table then it must be resized to fit inside all fragments (when enabled) or a single packet. But if the MTU becomes too low to transmit even the header + the VLAN specific part then the resizing of the local TT will never succeed. This can for example happen when the usable space is 110 bytes and 11 VLANs are on top of batman-adv. In this case, at least 116 byte would be needed. There will just be an endless spam of batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (110) in the log but the function will never finish. Problem here is that the timeout will be halved all the time and will then stagnate at 0 and therefore never be able to reduce the table even more. There are other scenarios possible with a similar result. The number of BATADV_TT_CLIENT_NOPURGE entries in the local TT can for example be too high to fit inside a packet. Such a scenario can therefore happen also with only a single VLAN + 7 non-purgable addresses - requiring at least 120 bytes. While this should be handled proactively when: * interface with too low MTU is added * VLAN is added * non-purgeable local mac is added * MTU of an attached interface is reduced * fragmentation setting gets disabled (which most likely requires dropping attached interfaces) not all of these scenarios can be prevented because batman-adv is only consuming events without the the possibility to prevent these actions (non-purgable MAC address added, MTU of an attached interface is reduced). It is therefore necessary to also make sure that the code is able to handle also the situations when there were already incompatible system configuration are present.
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
31 explicit affected versions
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34 explicit affected versions
6 explicit affected versions
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45 explicit affected versions
7 explicit affected versions
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38 explicit affected versions
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14 explicit affected versions
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12 explicit affected versions
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2 explicit affected versions
10 explicit affected versions
164 explicit affected versions
37 explicit affected versions
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13 explicit affected versions
10 explicit affected versions
27 explicit affected versions
1 explicit affected versions
31 explicit affected versions
26 explicit affected versions
13 explicit affected versions
6 explicit affected versions
1 explicit affected versions
29 explicit affected versions
81 explicit affected versions
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11 explicit affected versions
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2 explicit affected versions
39 explicit affected versions
32 explicit affected versions
107 explicit affected versions
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10 explicit affected versions
26 explicit affected versions
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27 explicit affected versions
1 explicit affected versions
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13 explicit affected versions
7 explicit affected versions
114 explicit affected versions
51 explicit affected versions
16 explicit affected versions
51 explicit affected versions
8 explicit affected versions
40 explicit affected versions
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51 explicit affected versions
67 explicit affected versions
5 explicit affected versions
12 explicit affected versions
37 explicit affected versions
27 explicit affected versions
23 explicit affected versions
1 explicit affected versions
1 explicit affected versions
71 explicit affected versions
1 explicit affected versions
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12 explicit affected versions
5 explicit affected versions
2 explicit affected versions
8 explicit affected versions
1 explicit affected versions
10 explicit affected versions
4 explicit affected versions
13 explicit affected versions
81 explicit affected versions
13 explicit affected versions
45 explicit affected versions
7 explicit affected versions
69 explicit affected versions
43 explicit affected versions
10 explicit affected versions
12 explicit affected versions
12 explicit affected versions
80 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
37 explicit affected versions
37 explicit affected versions
8 explicit affected versions
14 explicit affected versions
38 explicit affected versions
40 explicit affected versions
9 explicit affected versions
40 explicit affected versions
11 explicit affected versions
141 explicit affected versions
48 explicit affected versions
7 explicit affected versions
21 explicit affected versions
74 explicit affected versions
52 explicit affected versions
118 explicit affected versions
97 explicit affected versions
4 explicit affected versions
1 explicit affected versions
1 explicit affected versions
46 explicit affected versions
90 explicit affected versions
13 explicit affected versions
43 explicit affected versions
46 explicit affected versions
121 explicit affected versions
141 explicit affected versions
10 explicit affected versions
8 explicit affected versions
3 explicit affected versions
14 explicit affected versions
81 explicit affected versions
4 explicit affected versions
70 explicit affected versions
11 explicit affected versions
1 explicit affected versions
44 explicit affected versions
2 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: batman-adv: Avoid infinite loop trying to resize local TT If the MTU of one of an attached interface becomes too small to transmit the local translation table then it must be resized to fit inside all fragments (when enabled) or a single packet. But if the MTU becomes too low to transmit even the header + the VLAN specific part then the resizing of the local TT will never succeed. This can for example happen when the usable space is 110 bytes and 11 VLANs are on top of batman-adv. In this case, at least 116 byte would be needed. There will just be an endless spam of batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (110) in the log but the function will never finish. Problem here is that the timeout will be halved all the time and will then stagnate at 0 and therefore never be able to reduce the table even more. There are other scenarios possible with a similar result. The number of BATADV_TT_CLIENT_NOPURGE entries in the local TT can for example be too high to fit inside a packet. Such a scenario can therefore happen also with only a single VLAN + 7 non-purgable addresses - requiring at least 120 bytes. While this should be handled proactively when: * interface with too low MTU is added * VLAN is added * non-purgeable local mac is added * MTU of an attached interface is reduced * fragmentation setting gets disabled (which most likely requires dropping attached interfaces) not all of these scenarios can be prevented because batman-adv is only consuming events without the the possibility to prevent these actions (non-purgable MAC address added, MTU of an attached interface is reduced). It is therefore necessary to also make sure that the code is able to handle also the situations when there were already incompatible system configuration are present.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/b1f532a3b1e6d2e5559c7ace49322922637a28aa
- https://git.kernel.org/stable/c/04720ea2e6c64459a90ca28570ea78335eccd924
- https://git.kernel.org/stable/c/3fe79b2c83461edbbf86ed8a6f3924820ff89259
- https://git.kernel.org/stable/c/4ca2a5fb54ea2cc43edea614207fcede562d91c2
- https://git.kernel.org/stable/c/70a8be9dc2fb65d67f8c1e0c88c587e08e2e575d
- https://git.kernel.org/stable/c/87b6af1a7683e021710c08fc0551fc078346032f
- https://git.kernel.org/stable/c/b1f532a3b1e6d2e5559c7ace49322922637a28aa
- https://git.kernel.org/stable/c/b3ddf6904073990492454b1dd1c10a24be8c74c6
- https://git.kernel.org/stable/c/ca54e2671548616ad34885f90d4f26f7adb088f0
- https://ubuntu.com/security/CVE-2024-35982
- https://ubuntu.com/security/notices/USN-6893-1
- https://ubuntu.com/security/notices/USN-6893-2
- https://ubuntu.com/security/notices/USN-6893-3
- https://ubuntu.com/security/notices/USN-6896-1
- https://ubuntu.com/security/notices/USN-6896-2
- https://ubuntu.com/security/notices/USN-6896-3
- https://ubuntu.com/security/notices/USN-6896-4
- https://ubuntu.com/security/notices/USN-6896-5
- https://ubuntu.com/security/notices/USN-6898-1
- https://ubuntu.com/security/notices/USN-6898-2
- https://ubuntu.com/security/notices/USN-6898-3
- https://ubuntu.com/security/notices/USN-6898-4
- https://ubuntu.com/security/notices/USN-6917-1
- https://ubuntu.com/security/notices/USN-6918-1
- https://ubuntu.com/security/notices/USN-6919-1
- 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-7019-1
- https://www.cve.org/CVERecord?id=CVE-2024-35982