ipv6: mcast: use rcu_assign_pointer() for __rcu list updates
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: use rcu_assign_pointer() for __rcu list updates Several places in net/ipv6/mcast.c update RCU-protected lists (np->ipv6_mc_list, idev->mc_list, idev->mc_tomb) using direct pointer assignments instead of rcu_assign_pointer(): 1. In __ipv6_dev_mc_dec(), unlinking a group from idev->mc_list did: *map = ma->next; without rcu_assign_pointer() while concurrent readers traverse idev->mc_list locklessly under rcu_read_lock(). 2. In ipv6_sock_mc_drop() and __ipv6_sock_mc_close(), unlinking a group from np->ipv6_mc_list directly assigned *lnk = mc_lst->next and np->ipv6_mc_list = mc_lst->next without rcu_assign_pointer(), racing with lockless readers in inet6_mc_check(). 3. In __ipv6_sock_mc_join(), mc_lst->next was initialized to np->ipv6_mc_list via raw assignment before publishing mc_lst. 4. In mld_del_delrec() and __ipv6_dev_mc_inc(), __rcu source pointers passed into rcu_assign_pointer() lacked explicit dereference helpers. Fix these by consistently using rcu_assign_pointer() along with mc_dereference() / sock_dereference().
CVE-2026-98099
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-2026-98099
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": "456b61bca8ee324ab6c18b065e632c9a8c88aa39",
"lessThan": "0e3e3cec28c4d1bf29948da40b4e9e5d44f7852b",
"versionType": "git"
},
{
"status": "affected",
"version": "456b61bca8ee324ab6c18b065e632c9a8c88aa39",
"lessThan": "49d7e1b456ba2f3ee08b3e264d999c09992cde8e",
"versionType": "git"
},
{
"status": "affected",
"version": "456b61bca8ee324ab6c18b065e632c9a8c88aa39",
"lessThan": "afca229b39acc2590976b3e4f6e0fe76cededc60",
"versionType": "git"
},
{
"status": "affected",
"version": "456b61bca8ee324ab6c18b065e632c9a8c88aa39",
"lessThan": "2e46b0c9fcf7e10b64ce1630b925f47918d1f7f6",
"versionType": "git"
},
{
"status": "affected",
"version": "456b61bca8ee324ab6c18b065e632c9a8c88aa39",
"lessThan": "0c8f56c583c3250408367880c98e4d6fbc929315",
"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": "2.6.38"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.38",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"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/ipv6/mcast.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98099
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48851 · Revision 1
- Added to Heist Feed
- Publisher date