Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.4, < 4.4.11 |
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8358b0Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00044.htmlMailing ListThird 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 ListThird 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 TrackingThird Party Advisory
- https://github.com/torvalds/linux/commit/8358b02bf67d3a5d8a825070e1aa73f25fb2e4cVendor Advisory
- https://www.exploit-db.com/exploits/40759/Third Party AdvisoryVDB Entry
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8358b0Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00044.htmlMailing ListThird 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 ListThird Party Advisory
- https://bugs.chromium.org/p/project-zero/issues/detail?id=808Third Party Advisory
- https://bugs.debian.org/823603Third Party Advisory
FAQ
What is CVE-2016-4557?
CVE-2016-4557 is a vulnerability with a CVSS score of 7.8 (HIGH). 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...
How severe is CVE-2016-4557?
CVE-2016-4557 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2016-4557?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.