CVE-2016-4557

The replace_map_fd_with_map_ptr function in kernel/bpf/verifier.c in the Linux kernel before 4.5.5 does not properly maintain an fd data structure, which allows local users to gain privileges or cause a denial of service (use-after-free) via crafted BPF instructions that reference an incorrect file descriptor.

• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8358b02bf67d3a5d8a825070e1aa73f25fb2e4c7Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00044.htmlMailing List, Third Party Advisory
• http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.5.5Vendor Advisory
• http://www.openwall.com/lists/oss-security/2016/05/06/4Mailing List, Third Party Advisory
• https://bugs.chromium.org/p/project-zero/issues/detail?id=808Third Party Advisory
• https://bugs.debian.org/823603Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1334307Issue Tracking, Third Party Advisory
• https://github.com/torvalds/linux/commit/8358b02bf67d3a5d8a825070e1aa73f25fb2e4c7Vendor Advisory
• https://www.exploit-db.com/exploits/40759/Third Party Advisory, VDB Entry
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8358b02bf67d3a5d8a825070e1aa73f25fb2e4c7Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00044.htmlMailing List, Third Party Advisory
• http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.5.5Vendor Advisory
• http://www.openwall.com/lists/oss-security/2016/05/06/4Mailing List, Third Party Advisory
• https://bugs.chromium.org/p/project-zero/issues/detail?id=808Third Party Advisory
• https://bugs.debian.org/823603Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1334307Issue Tracking, Third Party Advisory
• https://github.com/torvalds/linux/commit/8358b02bf67d3a5d8a825070e1aa73f25fb2e4c7Vendor Advisory
• https://www.exploit-db.com/exploits/40759/Third Party Advisory, VDB Entry

Published

May 23, 2016

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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