add new advisories

Author: laffer1

latest-id.txt

@@ -1 +1 @@
-2026-12
+2026-13

vulns/midnightbsd/MNBSD-2026-13.yaml

@@ -0,0 +1,40 @@
+id: MNBSD-2026-13
+summary: Local DoS and possible privilege escalation via routing sockets
+details: |
+  The rtsock_msg_buffer() function serializes routing information into a buffer.
+  As a part of this, it copies sockaddr structures into a sockaddr_storage
+  structure on the stack. It assumes that the source sockaddr length field had
+  already been validated, but this is not necessarily the case, and it's possible
+  for a malicious userspace program to craft a request which triggers a 127-byte
+  overflow.
+
+  In practice, this overflow immediately overwrites the canary for the
+  rtsock_msg_buffer() stack frame, resulting in a panic once the function
+  returns.
+
+  The bug allows an unprivileged user to crash the kernel by triggering a stack
+  buffer overflow in rtsock_msg_buffer(). In particular, the overflow will
+  corrupt a stack canary value that is verified when the function returns; this
+  mitigates the impact of the stack overflow by triggering a kernel panic.
+
+  Other kernel bugs may exist which allow userspace to find the canary value and
+  thus defeat the mitigation, at which point local privilege escalation may be
+  possible.
+affected:
+  - package:
+      name: kernel
+      ecosystem: MidnightBSD
+    ranges:
+      - type: ECOSYSTEM
+        events:
+          - introduced: "0"
+          - fixed: "4.0.4"
+references:
+  - type: WEB
+    url: https://security.FreeBSD.org/advisories/FreeBSD-SA-26:05.route.asc
+  - type: WEB
+    url: https://www.cve.org/CVERecord?id=CVE-2026-3038
+aliases:
+  - CVE-2026-3038
+modified: "2026-02-24T12:00:00Z"
+published: "2026-02-24T12:00:00Z"