ISOMAN

CVE

CVE-2026-56099

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.

Severity
MEDIUM
CVSS
6.9
Published
Modified
NVD detailAll CVEs

Linked Releases

DistributionReleaseStatusEvidence
OpenBSD7.9 alpha boot-cdunknownsource
OpenBSD7.9 alpha installunknownsource
OpenBSD7.9 alpha minirootunknownsource
OpenBSD7.9 amd64 boot-cdunknownsource
OpenBSD7.9 amd64 floppyunknownsource
OpenBSD7.9 amd64 installunknownsource
OpenBSD7.9 amd64 minirootunknownsource
OpenBSD7.9 arm64 boot-cdunknownsource
OpenBSD7.9 arm64 installunknownsource
OpenBSD7.9 arm64 minirootunknownsource
OpenBSD7.9 armv7 minirootunknownsource
OpenBSD7.9 hppa boot-cdunknownsource
OpenBSD7.9 hppa installunknownsource
OpenBSD7.9 hppa lifunknownsource
OpenBSD7.9 i386 boot-cdunknownsource
OpenBSD7.9 i386 floppyunknownsource
OpenBSD7.9 i386 installunknownsource
OpenBSD7.9 i386 minirootunknownsource
OpenBSD7.9 landisk minirootunknownsource
OpenBSD7.9 loongson boot-cdunknownsource
OpenBSD7.9 loongson minirootunknownsource
OpenBSD7.9 luna88k minirootunknownsource
OpenBSD7.9 macppc boot-cdunknownsource
OpenBSD7.9 macppc installunknownsource
OpenBSD7.9 octeon installunknownsource
OpenBSD7.9 octeon minirootunknownsource
OpenBSD7.9 powerpc64 installunknownsource
OpenBSD7.9 powerpc64 minirootunknownsource
OpenBSD7.9 riscv64 installunknownsource
OpenBSD7.9 riscv64 minirootunknownsource
OpenBSD7.9 sparc64 boot-cdunknownsource
OpenBSD7.9 sparc64 floppyunknownsource
OpenBSD7.9 sparc64 floppy-bunknownsource
OpenBSD7.9 sparc64 installunknownsource
OpenBSD7.9 sparc64 minirootunknownsource

References

  1. https://github.com/openbsd/src/commit/6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd
  2. https://pop.argus-systems.ai/advisory/adv-040.html
  3. https://www.vulncheck.com/advisories/openbsd-mpls-do-error-kernel-stack-memory-disclosure-via-mpls-input
  4. http://seclists.org/fulldisclosure/2026/Jun/17
  5. http://www.openwall.com/lists/oss-security/2026/06/19/3