net: bridge: mcast: properly convert mglist to rcu
In the Linux kernel, the following vulnerability has been resolved: net: bridge: mcast: properly convert mglist to rcu Sashiko reported a bug [1] that br_multicast_del_port_group unlists the port group not using proper rcu helper that preserves the next pointer and after that immediately frees the port group without waiting for rcu grace period. The only rcu walker of mglist is br_multicast_list_adjacent() and it turns out that function has always been buggy because mglist was never properly converted to RCU. Fix it by converting it to rcu and moving its initialization after eth_addr's. Initializing p->next can use RCU_INIT_POINTER because we have a barrier from the hlist_add_head_rcu call later, besides we're initializing an unpublished structure anyway. [1] https://netdev-ai.bots.linux.dev/sashiko/#/patchset/20260826014200.362304-1-littleddfu%40gmail.com
CVE-2026-98026
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-2026-98026
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": "07f8ac4a1e26e8283542cdaf658a6e2a12fd6980",
"lessThan": "37cb9a81600da8250f24e25edc07253b62353cbe",
"versionType": "git"
},
{
"status": "affected",
"version": "07f8ac4a1e26e8283542cdaf658a6e2a12fd6980",
"lessThan": "98247c8264d2076f81fa114bdfa2c2271953ac7c",
"versionType": "git"
},
{
"status": "affected",
"version": "07f8ac4a1e26e8283542cdaf658a6e2a12fd6980",
"lessThan": "38ab2a435001a3c4dbeb70a52f5921e1ccd66f55",
"versionType": "git"
},
{
"status": "affected",
"version": "07f8ac4a1e26e8283542cdaf658a6e2a12fd6980",
"lessThan": "f7bf57e94a5d6214b87be08486cb33836fbfa573",
"versionType": "git"
},
{
"status": "affected",
"version": "07f8ac4a1e26e8283542cdaf658a6e2a12fd6980",
"lessThan": "4b772869a1e5f9da5cef5b9c722ec0aa424ee0a0",
"versionType": "git"
}
],
"programFiles": [
"net/bridge/br_multicast.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.16",
"versionType": "semver"
},
{
"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": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bridge/br_multicast.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98026
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38151 · Revision 1
- Added to Heist Feed
- Publisher date