Linux Kernel Local Privilege Escalation via PIE Binary Mapping Flaw (CVE-2017-1000253)
Executive & SecOps Summary
SECOPS ASSESSMENTUnpatched long-term support (LTS) Linux kernels and major enterprise distributions including Red Hat Enterprise Linux
A local attacker can exploit memory mapping flaws to bypass security boundaries, leading to full root privilege escalation
Apply the latest kernel security updates provided by your Linux distribution vendor immediately
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Update your Linux kernel to the latest version using the system package manager and reboot the system to apply changes.
# For Red Hat / CentOS systems
sudo yum update -y kernel
sudo reboot
# For Debian / Ubuntu systems
sudo apt-get update && sudo apt-get install --only-upgrade -y linux-image-generic
sudo reboot2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, restrict compiler access and harden temporary directories to prevent the execution of exploit payloads.
# Restrict compiler access for non-privileged users
sudo chmod 700 /usr/bin/gcc /usr/bin/make 2>/dev/null || true
# Remount temporary directories with noexec option
sudo mount -o remount,noexec /tmp
sudo mount -o remount,noexec /dev/shm3. Log Audit & IoC Verification Commands
Verify the current running kernel version and check if the security patch has been backported to your system.
# Check current running kernel version
uname -r
# Query package changelog for the specific CVE or commit (RHEL/CentOS)
rpm -q --changelog kernel | grep -E 'CVE-2017-1000253|a87938b2e246' || echo '[!] Warning: CVE-2017-1000253 patch not detected'Block Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability exists in the Linux kernel's ELF binary loader (load_elf_binary()) during the memory mapping process of Position Independent Executable (PIE) binaries. When CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE is enabled and a normal top-down address allocation strategy is used, the kernel attempts to map a PIE binary into an address range immediately below mm->mmap_base. However, load_elf_binary() fails to allocate sufficient space for the entire binary. Consequently, while the first PT_LOAD segment is mapped below mm->mmap_base, subsequent PT_LOAD segments end up being mapped above mm->mmap_base into the memory gap reserved between the stack and the binary.
2. Exploitation Mechanics & Attack Scenario
A local attacker with low-privilege access can execute a specially crafted, large PIE binary. Because the kernel does not properly calculate the required space, the subsequent PT_LOAD segments are forced into the stack-binary gap. As the program executes and the stack grows downward, it collides with the adjacent memory segments (a technique known as 'Stack Clash'). This memory corruption allows the attacker to overwrite critical memory structures, hijack the execution flow, and execute arbitrary code with elevated root privileges.
3. Infrastructure & Business Impact
With a CVSS score of 7.8 (High) and its inclusion in the CISA KEV (Known Exploited Vulnerabilities) catalog, this vulnerability poses a severe threat. In multi-tenant environments, shared servers, or containerized cloud infrastructures, a local attacker or compromised service account can escalate privileges to root. This allows complete host compromise, potential container escape, data exfiltration, and persistent backdoor installation, severely impacting business operations and trust.
Official Vendor Advisories & References
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.
Frequently Asked SecOps Questions (CVE-2017-1000253)
FAQQ1. How critical is CVE-2017-1000253 and is it actively exploited in the wild?
CVE-2017-1000253 is rated CVSS 7.8 (HIGH) with a 30-day EPSS exploitation probability of 10.7%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2017-1000253?
Primary impacted vendors include linux across linux_kernel. Scope summary: Linux Kernel versions prior to 3.10.77, unpatched LTS kernels, and enterprise distributions such as Red Hat Enterprise Linux 6 and 7
Q3. What temporary mitigations or workarounds exist for CVE-2017-1000253 before patching?
[Mitigation] Apply the latest kernel security updates provided by your Linux distribution vendor immediately Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2017-1000253
Instantly format this advisory into an executive CISO summary or engineering patch ticket.
🔗 Related Advisories in Similar Stack (linux)
View Category →Linux Kernel IPv6 Socket Memory Corruption Vulnerability (CVE-2026-53362) Analysis and Mitigation Guide
[Affected Scope] Linux kernel systems utilizing UDPv6 sockets with MSG_MORE and MSG_SPLICE_PAGES flags
Linux Kernel algif_aead In-place Operation Vulnerability Leading to Local Privilege Escalation (CVE-2026-31431)
[Affected Scope] Systems running Linux kernel with the `algif_aead` crypto subsystem module enabled.
Linux Kernel Netfilter Bridge ebt_snat ARP Rewrite Vulnerability (CVE-2026-53266)
[Affected Scope] Linux systems utilizing ebtables SNAT targets within bridge netfilter configurations.
Linux Kernel Memory Corruption via Missing Shared-Frag Marker in skbuff (CVE-2026-46300)
[Affected Scope] Linux kernel network stack (skbuff) and systems utilizing IPsec (ESP).
Subscribe to Daily Vulnerability Briefings & KEV Alerts
Concise morning briefings for SecOps, DevSecOps, and SRE teams covering newly exploited CVEs and mitigation priorities.