CVE-2023-52920: bpf: support non-r10 register spill/fill to/from stack in precision tracking

mediumCVSS 5.5CVE-2023-52920

CSIRTS triage

vendor: Linux product: Linux Kernel Memory corruption

What: The BPF subsystem does not properly handle register spill and fill operations to and from stack in precision tracking, potentially leading to memory safety issues.
Who is affected: Linux systems with BPF enabled and in use, particularly those running affected kernel versions.
Urgency: Medium priority; CVSS 5.5 and not currently exploited, but affects kernel memory safety.
Action: Apply a kernel patch that properly handles non-r10 register spill and fill operations in BPF precision tracking.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-52920

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2023-529200.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2023-52920	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund

Recent advisories for bpf

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2024-42067: bpf: Take return from set_memory_rox() into account with bpf_jit_binary_lock_ro()msrc · 2026-08-06
mediumCVE-2024-56665: bpf,perf: Fix invalid prog_array access in perf_event_detach_bpf_progmsrc · 2026-08-06
mediumCVE-2025-37959: bpf: Scrub packet on bpf_redirect_peermsrc · 2026-08-06
mediumCVE-2026-23383: bpf, arm64: Force 8-byte alignment for JIT buffer to prevent atomic tearingmsrc · 2026-08-06
highCVE-2026-45932: bpf: Fix tcx/netkit detach permissions when prog fd isn't givenmsrc · 2026-08-06
mediumCVE-2024-56702: bpf: Mark raw_tp arguments with PTR_MAYBE_NULLmsrc · 2026-08-06