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CVE-2025-40255net: core: prevent NULL deref in generic_hwtstamp_ioctl_lower()

Description

In the Linux kernel, the following vulnerability has been resolved: net: core: prevent NULL deref in generic_hwtstamp_ioctl_lower() The ethtool tsconfig Netlink path can trigger a null pointer dereference. A call chain such as: tsconfig_prepare_data() -> dev_get_hwtstamp_phylib() -> vlan_hwtstamp_get() -> generic_hwtstamp_get_lower() -> generic_hwtstamp_ioctl_lower() results in generic_hwtstamp_ioctl_lower() being called with kernel_cfg->ifr as NULL. The generic_hwtstamp_ioctl_lower() function does not expect a NULL ifr and dereferences it, leading to a system crash. Fix this by adding a NULL check for kernel_cfg->ifr in generic_hwtstamp_ioctl_lower(). If ifr is NULL, return -EINVAL.

Timeline

  1. ID reserved

    By Linux

  2. · 8 months later

    Published

  3. · 5 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Deferred.

EPSS (exploitation in 30 days)
0.20% · top 90% of all CVEs (14 Nov 2026)
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.

Affected products

  • Linux · Linux

    • affected 6e9e2eed4f39d52edf5fd006409d211facf49f6b – < 8817f816ae41908e9625c0770c4af0dcdcc01238
    • affected 6e9e2eed4f39d52edf5fd006409d211facf49f6b – < f796a8dec9beafcc0f6f0d3478ed685a15c5e062

  • Linux · Linux

    • affected 6.14
    • unaffected < 6.14
    • unaffected 6.17.10 – ≤ 6.17.*
    • unaffected 6.18 – ≤ *

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .