High

Linux kernel BPF DEVMAP out-of-bounds write due to signed index handling

IdentifiersCVE-2024-56615CWE-787· Out-of-bounds Write

CVE-2024-56615 is a Linux kernel BPF vulnerability in DEVMAP handling where signed integer variables are used as map entry indexes/iterators, leading to out-of-bounds memory access during element deletion and map teardown. The issue mirrors a reported XSKMAP bug and affects DEVMAP because the index used to access map entries is typed as int rather than u32. In addition, during dev_map_free(), the iterator used to walk all entries is also an int, which can likewise cause out-of-bounds accesses. The upstream fix changes these variables from int to u32 to prevent invalid negative or otherwise misinterpreted indexes from being used in array access. The provided crash trace shows the fault occurring in dev_map_free() from the bpf_map_free_deferred workqueue context.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can cause kernel memory corruption via out-of-bounds writes in the BPF DEVMAP subsystem. At minimum this can trigger kernel page faults, crashes, and denial of service. Because the flaw is an out-of-bounds write in kernel context, there is also potential for broader kernel compromise such as corruption of adjacent kernel objects and possible privilege escalation, although the specific exploitability beyond crash/DoS is not established in the provided content.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce exposure to untrusted BPF interactions by restricting who can load or manipulate BPF maps/programs, minimizing local untrusted access, and disabling or tightly controlling features and services that expose the vulnerable BPF attack surface. General hardening should include limiting privileged/containerized workloads that can reach BPF functionality. No complete workaround is provided in the supplied content aside from updating the kernel.

Remediation

Patch, then assume compromise.

Apply a Linux kernel update that includes the upstream fix for CVE-2024-56615. The fix changes the affected DEVMAP index and dev_map_free() iterator variable types from int to u32, eliminating the signed-index out-of-bounds condition. Use vendor-supplied patched kernel packages where available and reboot into the updated kernel after installation.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

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VendorProductType

LinuxLinux Kerneloperating_system

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ACTIVITY FEED

Recent activity

1 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.

1 SOURCESView more in app

No news coverage yet. Advisories and community discussion only.

What this page doesn’t show

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Exposure mapping

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Threat actor evidence

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Associated malware

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Detection signatures

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Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity