CVE-2026-31505

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-04-22. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In the Linux kernel, the following vulnerability has been resolved:

iavf: fix out-of-bounds writes in iavf_get_ethtool_stats()

iavf incorrectly uses real_num_tx_queues for ETH_SS_STATS. Since the value could change in runtime, we should use num_tx_queues instead.

Moreover iavf_get_ethtool_stats() uses num_active_queues while iavf_get_sset_count() and iavf_get_stat_strings() use real_num_tx_queues, which triggers out-of-bounds writes when we do "ethtool -L" and "ethtool -S" simultaneously [1].

For example when we change channels from 1 to 8, Thread 3 could be scheduled before Thread 2, and out-of-bounds writes could be triggered in Thread 3:

Thread 1 (ethtool -L) Thread 2 (work) Thread 3 (ethtool -S) iavf_set_channels() ... iavf_alloc_queues() -> num_active_queues = 8 iavf_schedule_finish_config() iavf_get_sset_count() real_num_tx_queues: 1 -> buffer for 1 queue iavf_get_ethtool_stats() num_active_queues: 8 -> out-of-bounds! iavf_finish_config() -> real_num_tx_queues = 8

Use immutable num_tx_queues in all related functions to avoid the issue.

[1] BUG: KASAN: vmalloc-out-of-bounds in iavf_add_one_ethtool_stat+0x200/0x270 Write of size 8 at addr ffffc900031c9080 by task ethtool/5800

CPU: 1 UID: 0 PID: 5800 Comm: ethtool Not tainted 6.19.0-enjuk-08403-g8137e3db7f1c #241 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: dump_stack_lvl+0x6f/0xb0 print_report+0x170/0x4f3 kasan_report+0xe1/0x180 iavf_add_one_ethtool_stat+0x200/0x270 iavf_get_ethtool_stats+0x14c/0x2e0 __dev_ethtool+0x3d0c/0x5830 dev_ethtool+0x12d/0x270 dev_ioctl+0x53c/0xe30 sock_do_ioctl+0x1a9/0x270 sock_ioctl+0x3d4/0x5e0 __x64_sys_ioctl+0x137/0x1c0 do_syscall_64+0xf3/0x690 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7da0e6e36d ...

The buggy address belongs to a 1-page vmalloc region starting at 0xffffc900031c9000 allocated at __dev_ethtool+0x3cc9/0x5830 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88813a013de0 pfn:0x13a013 flags: 0x200000000000000(node=0|zone=2) raw: 0200000000000000 0000000000000000 dead000000000122 0000000000000000 raw: ffff88813a013de0 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected

Memory state around the buggy address: ffffc900031c8f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc900031c9000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc900031c9080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc900031c9100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc900031c9180: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
2.9%
KEV
Not listed

Published

April 22, 2026

Last Modified

April 28, 2026

Advisory Details (4)

Auto-updated Jun 6, 2026
No patch confirmed yet.
generic

iavf: fix out-of-bounds writes in iavf_get_ethtool_stats() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fecacfc95f195b99c71c579a472120d0b4ed65fa
generic

iavf: fix out-of-bounds writes in iavf_get_ethtool_stats() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fdf902bf86a80bf15792a1d20a67a5302498d7f1
generic

iavf: fix out-of-bounds writes in iavf_get_ethtool_stats() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bb85741d2dc2be207353a412f51b83697fcbefcf
generic

iavf: fix out-of-bounds writes in iavf_get_ethtool_stats() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1f931dee5b726df1940348ec31614d64bac03aa6

Vendor Advisories for CVE-2026-31505(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 136 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
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  18. 2026-06-15 02:44 UTCGHSA enrichment
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  21. 2026-06-14 12:38 UTCGHSA enrichment
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  26. 2026-06-12 02:42 UTCGHSA enrichment
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  43. 2026-06-08 08:14 UTCGHSA enrichment
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  50. 2026-06-07 08:21 UTCGHSA enrichment
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  68. 2026-06-03 16:57 UTCGHSA enrichment
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  73. 2026-06-02 16:19 UTCEG score recompute
  74. 2026-06-02 16:19 UTCGHSA enrichment
  75. 2026-06-02 04:14 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-31505?
CVE-2026-31505 is a high vulnerability published on April 22, 2026. In the Linux kernel, the following vulnerability has been resolved: iavf: fix out-of-bounds writes in iavfgetethtool_stats() iavf incorrectly uses realnumtxqueues for ETHSS_STATS. Since the value could change in runtime, we should use numtxqueues instead. Moreover iavfgetethtoolstats() uses…
When was CVE-2026-31505 disclosed?
CVE-2026-31505 was first published in the National Vulnerability Database on April 22, 2026, with the most recent update on April 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31505 actively exploited?
CVE-2026-31505 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-31505?
CVE-2026-31505 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-31505?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31505, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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