CVE-2018-1000200
The Linux Kernel versions 4.14, 4.15, and 4.16 has a null pointer dereference which can result in an out of memory (OOM) killing of large mlocked processes.
Does this matter?
Lower severity and a low EPSS score (0.48%). Track it; it rarely justifies an emergency change on its own.
Description
The Linux Kernel versions 4.14, 4.15, and 4.16 has a null pointer dereference which can result in an out of memory (OOM) killing of large mlocked processes. The issue arises from an oom killed process's final thread calling exit_mmap(), which calls munlock_vma_pages_all() for mlocked vmas.This can happen synchronously with the oom reaper's unmap_page_range() since the vma's VM_LOCKED bit is cleared before munlocking (to determine if any other vmas share the memory and are mlocked).
- CVSS 3.0
- 5.5 MEDIUMCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.48% probability · 40th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- cve@mitre.org
References
- http://seclists.org/oss-sec/2018/q2/67Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/104397Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:2948
- https://access.redhat.com/security/cve/cve-2018-1000200Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=27ae357fa82be5ab73b2ef8d39dcb8ca2563483aMitigation, Patch, Vendor Advisory
- https://marc.info/?l=linux-kernel&m=152400522806945Mailing List, Third Party Advisory
- https://marc.info/?l=linux-kernel&m=152460926619256Mailing List, Third Party Advisory
- https://usn.ubuntu.com/3752-1/
- https://usn.ubuntu.com/3752-2/
- https://usn.ubuntu.com/3752-3/
- http://seclists.org/oss-sec/2018/q2/67Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/104397Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:2948
- https://access.redhat.com/security/cve/cve-2018-1000200Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=27ae357fa82be5ab73b2ef8d39dcb8ca2563483aMitigation, Patch, Vendor Advisory
- https://marc.info/?l=linux-kernel&m=152400522806945Mailing List, Third Party Advisory
- https://marc.info/?l=linux-kernel&m=152460926619256Mailing List, Third Party Advisory
- https://usn.ubuntu.com/3752-1/
- https://usn.ubuntu.com/3752-2/
- https://usn.ubuntu.com/3752-3/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.