Memory disclosure via IOAM6 queue-index mismatch
Published May 6, 2026 · Updated May 6, 2026
Out-of-bounds read in the Linux Kernel IOAM6 trace path allows remote attackers to disclose kernel memory or crash hosts via IPv6 traffic. When trace type bit 6 is set on the RX path, __ioam6_fill_trace_data() passes an ingress RX queue index to skb_get_tx_queue() without checking it against the egress device's TX queue count. Exploitation requires IOAM6 tracing and an ingress device with more RX queues than the egress device has TX queues; the invalid dev->_tx[] read can enter trace output or interrupt the host.
Summary
What happened
Out-of-bounds read in the Linux Kernel IOAM6 trace path allows remote attackers to disclose kernel memory or crash hosts via IPv6 traffic. When trace type bit 6 is set on the RX path, __ioam6_fill_trace_data() passes an ingress RX queue index to skb_get_tx_queue() without checking it against the egress device's TX queue count. Exploitation requires IOAM6 tracing and an ingress device with more RX queues than the egress device has TX queues; the invalid dev->_tx[] read can enter trace output or interrupt the host.
The record
- CVE
- CVE-2026-43083
- Published
- May 6, 2026
- Updated
- May 6, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-125, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 6, 2026CVE publishedPublication date reported by the CVE source.
- May 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=5.17
- Affected versionversion=b63c5478e9cb1d1504eb02d9dac827ad24612b32 <6d1d9ed9b409e0662241e3d245d574a18f643494
- Affected versionversion=b63c5478e9cb1d1504eb02d9dac827ad24612b32 <95a1334748c95dd15546056280ade0c4b8dd7b78
- Affected versionversion=b63c5478e9cb1d1504eb02d9dac827ad24612b32 <b30b1675aa2bcf0491fd3830b051df4e08a7c8ca
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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