CVE-2024-46826

What it actually does

Race condition in ELF loader allowing two reads of the sysctl randomize_va_space to observe inconsistent values during a single execve, resulting in unpredictable virtual address space layout.

Why it matters to the business

Potential for inconsistent process memory layouts on Linux systems that could undermine ASLR expectations or cause unexpected execution behavior; high prevalence of the kernel codebase amplifies the need for prompt patching across server and container fleets.

How an attack unfolds

An attacker with the ability to modify the randomize_va_space sysctl between the two reads performed by the ELF loader could cause the kernel to use mismatched randomization decisions for the same binary execution, leading to unpredictable memory layout outcomes.

How to fix it

Upgrade the Linux kernel to the fixed commit 1f81d51141a234ad0a3874b4d185dc27a521cd27 or later stable releases that perform a single load of randomize_va_space; apply the patch via distribution updates as soon as available.

How to confirm the fix worked

Confirm the running kernel contains commit 1f81d51141a234ad0a3874b4d185dc27a521cd27; verify that ELF loading now performs exactly one read of randomize_va_space by inspecting the loader source or testing under rapid sysctl changes.

Typical attack path

1. Obtain privileges or access sufficient to alter the randomize_va_space sysctl value
2. Trigger execution of a target ELF binary while racing the sysctl change against the loader's double read
3. Observe or leverage the resulting inconsistent VA space layout for follow-on attacks

How to detect it

Review kernel logs and audit trails for unusual process startup patterns coinciding with sysctl changes on randomize_va_space; examine ELF loader behavior under concurrent sysctl modifications in test environments.

What your security team should do

• Prioritize kernel updates on all Linux hosts and container hosts within the next patching cycle
• Monitor vendor advisories for backported fixes in supported distributions
• Review and enforce least-privilege controls on sysctl modifications