ipv6: addrconf: fix temp address generation after prefix deprecation
In the Linux kernel, the following vulnerability has been resolved: ipv6: addrconf: fix temp address generation after prefix deprecation When a router temporarily deprecates an IPv6 prefix (either by sending a Router Advertisement with Preferred Lifetime = 0 or by letting the lifetime expire) and later restores it, the kernel permanently loses its ability to generate temporary privacy addresses (RFC 8981) for that prefix. This happens because the address worker attempts to generate a replacement temporary address when the current one nears expiration. As the base prefix is deprecated already, the generation fails after marking the temporary address as already having spawned a replacement (ifp->regen_count++). When the router eventually restores the prefix, the temporary address becomes active again. However, once it naturally expires, the address worker sees this temporary address already tried to generate one and skips the regeneration. Fix the issue by resetting the regen_count check of the latest temp address generated for the prefix updated by the incoming RA.
CVE-2026-97472
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-2026-97472
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": "76f793e3a47139d340185cbc1a314740c09b13d3",
"lessThan": "b00f7c1da82a809156f785ed37536c2d2584927d",
"versionType": "git"
},
{
"status": "affected",
"version": "76f793e3a47139d340185cbc1a314740c09b13d3",
"lessThan": "6da8ba900b85e6478e211427630c67595fb707a4",
"versionType": "git"
},
{
"status": "affected",
"version": "76f793e3a47139d340185cbc1a314740c09b13d3",
"lessThan": "4f7d2a8dc364c4e55d0a1533451339008512933f",
"versionType": "git"
},
{
"status": "affected",
"version": "76f793e3a47139d340185cbc1a314740c09b13d3",
"lessThan": "f601ec5c92b3260c742f27a5d2fd289e30ae798f",
"versionType": "git"
},
{
"status": "affected",
"version": "76f793e3a47139d340185cbc1a314740c09b13d3",
"lessThan": "bff7b87dfa28a1502c18d0c6f1fadda5162fa854",
"versionType": "git"
},
{
"status": "affected",
"version": "76f793e3a47139d340185cbc1a314740c09b13d3",
"lessThan": "4df5597c65446135362f72880995e8920f058fa0",
"versionType": "git"
},
{
"status": "affected",
"version": "76f793e3a47139d340185cbc1a314740c09b13d3",
"lessThan": "e20d8922aa8fe441d291364c96c2179a005b79ea",
"versionType": "git"
}
],
"programFiles": [
"net/ipv6/addrconf.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv6/addrconf.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97472
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #8337 · Revision 1
- Added to Heist Feed
- Publisher date