CVE Explorer
CVE-2026-49412
The kernel handler for IPV6_MSFILTER dropped a serializing lock in order to copy the source-filter list from userspace, then reacquired the lock. During this window another thread could free the multicast filter structure, leaving the handler with a stale pointer to freed memory.
An unprivileged local user can exploit this use-after-free to escalate privileges.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unknown","modules":["ip6_multicast"],"product":"FreeBSD","vendor":"FreeBSD","versions":[{"lessThan":"p10","status":"affected","version":"15.0-RELEASE","versionType":"release"},{"lessThan":"p6","status":"affected","version":"14.4-RELEASE","versionType":"release"},{"lessThan":"p15","status":"affected","version":"14.3-RELEASE","versionType":"release"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:fe978ccd4b5d39235268cb727dd809f82fdf1164993ec27b3a7376981250af0d · sha256:36ee5d7b6c682721… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:fe978ccd4b5d39235268cb727dd809f82fdf1164993ec27b3a7376981250af0d · sha256:36ee5d7b6c682721… · /containers/adp/0/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-416","description":"CWE-416: Use After Free","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:fe978ccd4b5d39235268cb727dd809f82fdf1164993ec27b3a7376981250af0d · sha256:36ee5d7b6c682721… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"tags":["vendor-advisory"],"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:29.ip6_multicast.asc"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:fe978ccd4b5d39235268cb727dd809f82fdf1164993ec27b3a7376981250af0d · sha256:36ee5d7b6c682721… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.