Low

Out-of-bounds write in Linux kernel BPF __bpf_get_stackid() stack map handling

IdentifiersCVE-2025-68378CWE-787

CVE-2025-68378 is a Linux kernel vulnerability in the BPF subsystem, fixed by the change described as "bpf: Fix stackmap overflow check in __bpf_get_stackid()." According to the provided content, Syzkaller reported a KASAN-detected slab out-of-bounds write in __bpf_get_stackid() during copying of stack trace data. The flaw occurs when a perf trace contains more stack entries than the destination stack map bucket can hold. In that condition, the kernel writes past the end of the bucket's data array because the overflow check for stack map capacity was insufficient.

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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 trigger a kernel slab out-of-bounds write, leading primarily to kernel memory corruption and system instability. Based on the provided CVSS vector AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, the documented impact is primarily denial of service via kernel crash or similar availability loss. The provided content does not establish confidentiality or integrity impact beyond the memory corruption condition itself.

Mitigation

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

If immediate patching is not possible, reduce exposure by restricting local access and limiting the ability of low-privileged users to exercise vulnerable BPF/perf stack trace paths. Because the provided content characterizes the issue as local with low privileges required, minimizing untrusted local code execution and tightening access to BPF-related capabilities may reduce risk. However, the authoritative mitigation in the provided content is to install the fixed kernel update and reboot.

Remediation

Patch, then assume compromise.

Apply a Linux kernel update that includes the fix for "bpf: Fix stackmap overflow check in __bpf_get_stackid()." The provided content indicates fixed package versions are available in multiple SUSE product lines, including kernel-default >= 6.4.0-150700.53.28.1 for SUSE Linux Enterprise Server 15 SP7 and related products, kernel-default >= 6.12.0-160000.9.1 for SUSE Linux Enterprise Server 16.0 and related products, and kernel-default >= 6.4.0-39.1 for SUSE Linux Micro 6.0/6.1. SUSE also instructs customers to reboot after installing the update.

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.

ACTIVITY FEED

Recent activity

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

11 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

Every observed campaign linking this CVE to a named adversary.

Associated malware

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Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

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

Social activity3