# CVE-2017-1000253

Linux distributions that have not patched their long-term kernels with https://git.kernel.org/linus/a87938b2e246b81b4fb713edb371a9fa3c5c3c86 (committed on April 14, 2015). This kernel vulnerability was fixed in April 2015 by commit a87938b2e246b81b4fb713edb371a9fa3c5c3c86 (backported to Linux 3.10.77 in May 2015), but it was not recognized as a security threat. With CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE enabled, and a normal top-down address allocation strategy, load_elf_binary() will attempt to map a PIE binary into an address range immediately below mm->mmap_base. Unfortunately, load_elf_ binary() does not take account of the need to allocate sufficient space for the entire binary which means that, while the first PT_LOAD segment is mapped below mm->mmap_base, the subsequent PT_LOAD segment(s) end up being mapped above mm->mmap_base into the are that is supposed to be the "gap" between the stack and the binary.

- Page: https://www.vulneraibility.com/cve/CVE-2017-1000253
- CVSS: 7.8
- Known exploited: yes, in CISA KEV since 2024-09-09; CISA due date 2024-09-30; known ransomware use
- EPSS: 10.70%
- Public exploit code: 1 on Exploit-DB · 2 GitHub proofs of concept (first 2017-09-26)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2024-09-10)
- Weakness: CWE-119
- Published: 2017-10-05

## Affected

- centos:centos
- redhat:enterprise_linux
- linux:linux_kernel

## References

- [advisory] https://access.redhat.com/errata/RHSA-2017:2798
- [advisory] https://access.redhat.com/errata/RHSA-2017:2795
- [other] http://www.securitytracker.com/id/1039434
- [advisory] https://access.redhat.com/errata/RHSA-2017:2801
- [advisory] https://access.redhat.com/errata/RHSA-2017:2796
- [other] http://www.securityfocus.com/bid/101010
- [advisory] https://access.redhat.com/errata/RHSA-2017:2799
- [advisory] https://access.redhat.com/errata/RHSA-2017:2794
- [advisory] https://access.redhat.com/errata/RHSA-2017:2793
- [advisory] https://access.redhat.com/errata/RHSA-2017:2797
- [advisory] https://access.redhat.com/errata/RHSA-2017:2802
- [other] https://www.qualys.com/2017/09/26/cve-2017-1000253/cve-2017-1000253.txt
- [advisory] https://access.redhat.com/errata/RHSA-2017:2800
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-1000253

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.