net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels
In the Linux kernel, the following vulnerability has been resolved: net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels Some lwtunnels have a dst cache for post-transformation dst. If the packet destination did not change we may end up recording a reference to the lwtunnel in its own cache, and the lwtunnel state will never be freed. Discovered by the ioam6.sh test, kmemleak was recently fixed to catch per-cpu memory leaks. I'm not sure if rpl and seg6 can actually hit this, but in principle I don't see why not.
CVE-2025-21768
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-2025-21768
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": "6c8702c60b88651072460f3f4026c7dfe2521d12",
"lessThan": "e2ef3fa31353b30bda94358fe5205c141289746d",
"versionType": "git"
},
{
"status": "affected",
"version": "6c8702c60b88651072460f3f4026c7dfe2521d12",
"lessThan": "5ab11a4e219e93b8b31a27f8ec98d42afadd8b7a",
"versionType": "git"
},
{
"status": "affected",
"version": "6c8702c60b88651072460f3f4026c7dfe2521d12",
"lessThan": "4c0f200c7d06fedddde82209c099014d63f4a6c0",
"versionType": "git"
},
{
"status": "affected",
"version": "6c8702c60b88651072460f3f4026c7dfe2521d12",
"lessThan": "92191dd1073088753821b862b791dcc83e558e07",
"versionType": "git"
}
],
"programFiles": [
"net/ipv6/ioam6_iptunnel.c",
"net/ipv6/rpl_iptunnel.c",
"net/ipv6/seg6_iptunnel.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.16",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.4",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv6/ioam6_iptunnel.c",
"net/ipv6/rpl_iptunnel.c",
"net/ipv6/seg6_iptunnel.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21768
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #45944 · Revision 1
- Added to Heist Feed
- Publisher date