Openbsd: >> Openbsd >> 6.9 Security Vulnerabilities
sys/kern/sysv_sem.c in OpenBSD through 7.9 has a use-after-free allowing local privilege escalation to root. This is a context switch use-after-free after tsleep in sys_semget().
CVSS Score
7.4
EPSS Score
0.001
Published
2026-06-25
OpenBSD before commit 6a23123 (2026-06-18) contains an out-of-bounds read vulnerability in the mpls_do_error function within sys/netmpls/mpls_input.c that allows remote attackers to disclose kernel stack memory by sending crafted MPLS frames with 16 labels and no Bottom-of-Stack bit set.
CVSS Score
6.9
EPSS Score
0.004
Published
2026-06-18
sppp_pap_input in sys/net/if_spppsubr.c in OpenBSD before 076e2b1 allows authentication bypass via certain zero values for lengths.
CVSS Score
5.8
EPSS Score
0.004
Published
2026-06-17
In OpenBSD through 7.8, the slaacd and rad daemons have an infinite loop when they receive a crafted ICMPv6 Neighbor Discovery (ND) option (over a local network) with length zero, because of an "nd_opt_len * 8 - 2" expression with no preceding check for whether nd_opt_len is zero.
CVSS Score
4.3
EPSS Score
0.002
Published
2026-04-21
In OpenBSD 7.6 before errata 006 and OpenBSD 7.5 before errata 015, traffic sent over wg(4) could result in kernel crash.
CVSS Score
7.1
EPSS Score
0.004
Published
2025-03-20
In OpenBSD 7.4 before errata 014, vmm(4) did not restore GDTR limits properly on Intel (VMX) CPUs.
CVSS Score
6.2
EPSS Score
0.001
Published
2024-12-06
In OpenBSD 7.5 before errata 009 and OpenBSD 7.4 before errata 022, exclude any '/' in readdir name validation to avoid unexpected directory traversal on untrusted file systems.
CVSS Score
4.1
EPSS Score
0.003
Published
2024-12-05
In OpenBSD 7.4 before errata 006 and OpenBSD 7.3 before errata 020, httpd(8) is vulnerable to a NULL dereference when handling a malformed fastcgi request.
CVSS Score
8.7
EPSS Score
0.004
Published
2024-12-05
In OpenBSD 7.5 before errata 008 and OpenBSD 7.4 before errata 021,
avoid possible mbuf double free in NFS client and server implementation, do not use uninitialized variable in error handling of NFS server.
CVSS Score
9.2
EPSS Score
0.004
Published
2024-11-15
OpenBSD Kernel Multicast Routing Uninitialized Memory Information Disclosure Vulnerability. This vulnerability allows local attackers to disclose sensitive information on affected installations of OpenBSD Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the implementation of multicast routing. The issue results from the lack of proper initialization of memory prior to accessing it. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges and execute arbitrary code in the context of the kernel.
. Was ZDI-CAN-14540.
CVSS Score
3.8
EPSS Score
0.002
Published
2024-05-07
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