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CVE Record

CVE-2023-54181: bpf: Fix issue in verifying allow_ptr_leaks

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix issue in verifying allow_ptr_leaks After we converted the capabilities of our networking-bpf program from cap_sys_admin to cap_net_admin+cap_bpf, our networking-bpf program failed to start. Because it failed the bpf verifier, and the error log is "R3 pointer comparison prohibited". A simple reproducer as follows, SEC("cls-ingress") int ingress(struct __sk_buff *skb) { struct iphdr *iph = (void *)(long)skb->data + sizeof(struct ethhdr); if ((long)(iph + 1) > (long)skb->data_end) return TC_ACT_STOLEN; return TC_ACT_OK; } Per discussion with Yonghong and Alexei [1], comparison of two packet pointers is not a pointer leak. This patch fixes it. Our local kernel is 6.1.y and we expect this fix to be backported to 6.1.y, so stable is CCed. [1]. https://lore.kernel.org/bpf/CAADnVQ+Nmspr7Si+pxWn8zkE7hX-7s93ugwC+94aXSy4uQ9vBg@mail.gmail.com/

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel BPF issue can cause some legitimate networking BPF programs to be rejected by the verifier. The provided sources describe an operational failure after capability changes, not a proven attacker technique. Business urgency depends on whether affected Linux kernels run BPF-based networking, traffic control, observability, or security tooling.

Executive priority

Treat as a targeted Linux platform maintenance item. Escalate priority where BPF-based networking or security controls are business-critical, because the documented impact is service/tooling failure rather than confirmed compromise.

Technical view

The BPF verifier treated comparison between packet pointers as prohibited under allow_ptr_leaks handling. The source states this packet-pointer comparison is not a pointer leak. Affected Linux versions include 5.8 through fixed 6.1.53, 6.4.16, 6.5.3, and 6.6 boundaries as listed in the CVE bundle.

Likely exposure

Exposure is most likely on Linux systems running affected kernel versions and using BPF networking programs. Systems not using BPF features may still carry the vulnerable code, but practical impact is unclear from the sources.

Exploitation context

The source bundle does not report active exploitation, and KEV is false. The available evidence describes verifier rejection of valid BPF programs, not a demonstrated privilege escalation, data leak, or remote attack path.

Researcher notes

Evidence is limited: no CVSS, CWE, or exploit details are provided. The core issue is verifier logic around allow_ptr_leaks and packet pointer comparison. Avoid assuming broader security impact without kernel maintainer or distributor analysis.

Mitigation direction

  • Update affected Linux kernels through vendor-supported packages or stable backports.
  • Confirm vendor advisories include one of the referenced upstream stable fixes.
  • Prioritize systems using BPF networking, traffic control, observability, or enforcement tooling.
  • If no packaged fix exists, follow Linux distributor guidance before custom kernel changes.

Validation and detection

  • Inventory Linux kernel versions against the affected ranges in the CVE bundle.
  • Check distro changelogs for the referenced BPF verifier fix or stable commit backport.
  • Review BPF verifier logs for pointer comparison rejection symptoms.
  • Regression-test networking BPF programs after kernel update.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
5Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux2c78ee898d8f10ae6fb2fa23a3fbaec96b1b7366, 2c78ee898d8f10ae6fb2fa23a3fbaec96b1b7366, 2c78ee898d8f10ae6fb2fa23a3fbaec96b1b7366, 2c78ee898d8f10ae6fb2fa23a3fbaec96b1b7366unaffected
LinuxLinux5.8, 0, 6.1.53, 6.4.16, 6.5.3, 6.6affected
Weakness

CWE details

No CWE listed

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