ipv6: mcast: extend RCU protection in igmp6_send()
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: extend RCU protection in igmp6_send() igmp6_send() can be called without RTNL or RCU being held. Extend RCU protection so that we can safely fetch the net pointer and avoid a potential UAF. Note that we no longer can use sock_alloc_send_skb() because ipv6.igmp_sk uses GFP_KERNEL allocations which can sleep. Instead use alloc_skb() and charge the net->ipv6.igmp_sk socket under RCU protection.
CVE-2025-21759
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-2025-21759
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": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551",
"lessThan": "638e8fe3563a82f298fe537a28d5342a97278cf1",
"versionType": "git"
},
{
"status": "affected",
"version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551",
"lessThan": "6901bbb169e3add6c037218d996790cef6b3d650",
"versionType": "git"
},
{
"status": "affected",
"version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551",
"lessThan": "7e0a818ecc4d62e7fb668ea02de0bfe8ba0b7dff",
"versionType": "git"
},
{
"status": "affected",
"version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551",
"lessThan": "81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a",
"versionType": "git"
},
{
"status": "affected",
"version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551",
"lessThan": "0bf8e2f3768629d437a32cb824149e6e98254381",
"versionType": "git"
},
{
"status": "affected",
"version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551",
"lessThan": "8e92d6a413feaf968a33f0b439ecf27404407458",
"versionType": "git"
},
{
"status": "affected",
"version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551",
"lessThan": "087c1faa594fa07a66933d750c0b2610aa1a2946",
"versionType": "git"
}
],
"programFiles": [
"net/ipv6/mcast.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.26"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.26",
"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": "6.6.79",
"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/mcast.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21759
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #8238 · Revision 1
- Added to Heist Feed
- Publisher date