ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src()
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src() When removing a source filter whose count reaches zero, ip6_mc_del1_src() unlinks psf from pmc->mca_sources. If the filter was previously active, the code moved psf directly into pmc->mca_tomb by updating psf->sf_next. Because pmc->mca_sources is traversed locklessly under RCU (e.g. by ipv6_chk_mcast_addr()), mutating psf->sf_next before a grace period elapses diverts concurrent readers to the tombstone list. Consequently, readers miss remaining active sources in pmc->mca_sources and improperly examine deleted tombstone entries. Fix this by allocating a new tombstone node for pmc->mca_tomb (as done in sf_setstate()) and retiring the original psf via kfree_rcu().
CVE-2026-98102
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-2026-98102
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": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
"lessThan": "c3343cd7ec8706c221e52b782f386b9af14a928a",
"versionType": "git"
},
{
"status": "affected",
"version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
"lessThan": "4352737297b262e8367675c19a7dc6a9f53c97af",
"versionType": "git"
},
{
"status": "affected",
"version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
"lessThan": "8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4",
"versionType": "git"
},
{
"status": "affected",
"version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
"lessThan": "5149c60c406595b56fda0c6e9aae7fd287f636aa",
"versionType": "git"
},
{
"status": "affected",
"version": "4b200e398953c237c86d32bf26d4cb2a96556a6f",
"lessThan": "93b49239840b91313adbd77b8b52993eff2d08c1",
"versionType": "git"
},
{
"status": "affected",
"version": "86c49119f0353f857cc08030ec9e4ebaab3d5a64",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.261",
"lessThan": "5.11",
"versionType": "semver"
}
],
"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": "5.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.13",
"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/ipv6/mcast.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98102
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38205 · Revision 1
- Added to Heist Feed
- Publisher date