batman-adv: Avoid infinite loop trying to resize local TT
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)
CVE-2024-35982
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2024-35982
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "a19d3d85e1b854e4a483a55d740a42458085560d",
"lessThan": "04720ea2e6c64459a90ca28570ea78335eccd924",
"versionType": "git"
},
{
"status": "affected",
"version": "a19d3d85e1b854e4a483a55d740a42458085560d",
"lessThan": "b3ddf6904073990492454b1dd1c10a24be8c74c6",
"versionType": "git"
},
{
"status": "affected",
"version": "a19d3d85e1b854e4a483a55d740a42458085560d",
"lessThan": "70a8be9dc2fb65d67f8c1e0c88c587e08e2e575d",
"versionType": "git"
},
{
"status": "affected",
"version": "a19d3d85e1b854e4a483a55d740a42458085560d",
"lessThan": "87b6af1a7683e021710c08fc0551fc078346032f",
"versionType": "git"
},
{
"status": "affected",
"version": "a19d3d85e1b854e4a483a55d740a42458085560d",
"lessThan": "3fe79b2c83461edbbf86ed8a6f3924820ff89259",
"versionType": "git"
},
{
"status": "affected",
"version": "a19d3d85e1b854e4a483a55d740a42458085560d",
"lessThan": "4ca2a5fb54ea2cc43edea614207fcede562d91c2",
"versionType": "git"
},
{
"status": "affected",
"version": "a19d3d85e1b854e4a483a55d740a42458085560d",
"lessThan": "ca54e2671548616ad34885f90d4f26f7adb088f0",
"versionType": "git"
},
{
"status": "affected",
"version": "a19d3d85e1b854e4a483a55d740a42458085560d",
"lessThan": "b1f532a3b1e6d2e5559c7ace49322922637a28aa",
"versionType": "git"
}
],
"programFiles": [
"net/batman-adv/translation-table.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "4.19.313",
"versionType": "semver",
"lessThanOrEqual": "4.19.*"
},
{
"status": "unaffected",
"version": "5.4.275",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.216",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.156",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.87",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.28",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.8.7",
"versionType": "semver",
"lessThanOrEqual": "6.8.*"
},
{
"status": "unaffected",
"version": "6.9",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/batman-adv/translation-table.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-35982
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #26565 · Revision 1
- Added to Heist Feed
- Publisher date