batman-adv: Avoid infinite loop trying to resize local TT

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Summary

CVECVE-2024-35982
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-05-20 10:15:12 UTC
Updated2026-05-12 12:16:45 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-835 | CWE-835 CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1ADPDECLARED5.1MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary5.1MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a19d3d85e1b854e4a483a55d740a42458085560d 04720ea2e6c64459a90ca28570ea78335eccd924 git Not specified
CNA Linux Linux affected a19d3d85e1b854e4a483a55d740a42458085560d b3ddf6904073990492454b1dd1c10a24be8c74c6 git Not specified
CNA Linux Linux affected a19d3d85e1b854e4a483a55d740a42458085560d 70a8be9dc2fb65d67f8c1e0c88c587e08e2e575d git Not specified
CNA Linux Linux affected a19d3d85e1b854e4a483a55d740a42458085560d 87b6af1a7683e021710c08fc0551fc078346032f git Not specified
CNA Linux Linux affected a19d3d85e1b854e4a483a55d740a42458085560d 3fe79b2c83461edbbf86ed8a6f3924820ff89259 git Not specified
CNA Linux Linux affected a19d3d85e1b854e4a483a55d740a42458085560d 4ca2a5fb54ea2cc43edea614207fcede562d91c2 git Not specified
CNA Linux Linux affected a19d3d85e1b854e4a483a55d740a42458085560d ca54e2671548616ad34885f90d4f26f7adb088f0 git Not specified
CNA Linux Linux affected a19d3d85e1b854e4a483a55d740a42458085560d b1f532a3b1e6d2e5559c7ace49322922637a28aa git Not specified
CNA Linux Linux affected 3.13 Not specified
CNA Linux Linux unaffected 3.13 semver Not specified
CNA Linux Linux unaffected 4.19.313 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.275 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.216 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.156 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.87 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.28 6.6.* semver Not specified
CNA Linux Linux unaffected 6.8.7 6.8.* semver Not specified
CNA Linux Linux unaffected 6.9 * original_commit_for_fix Not specified
ADP Linux Linux Kernel affected 3.13 Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2024/06/msg00017.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/70a8be9dc2fb65d67f8c1e0c88c587e08e2e575d af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/04720ea2e6c64459a90ca28570ea78335eccd924 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/b1f532a3b1e6d2e5559c7ace49322922637a28aa af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/4ca2a5fb54ea2cc43edea614207fcede562d91c2 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/87b6af1a7683e021710c08fc0551fc078346032f af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/ca54e2671548616ad34885f90d4f26f7adb088f0 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/3fe79b2c83461edbbf86ed8a6f3924820ff89259 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/b3ddf6904073990492454b1dd1c10a24be8c74c6 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2024/06/msg00020.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
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