What’s Vulnerable › Vulnerabilities

CVE-2026-63986: ethtool: tsinfo: don't pass ERR_PTR to genlmsg_cancel on prepare failure

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-19 · updated 2026-10-08
• Weakness: CWE-763

Description

In the Linux kernel, the following vulnerability has been resolved: ethtool: tsinfo: don't pass ERR_PTR to genlmsg_cancel on prepare failure The goto err label leads to: genlmsg_cancel(skb, ehdr); return ret; If ethnl_tsinfo_prepare_dump() failed, it has not started a genlmsg. There's nothing to cancel, and passing an error pointer to genlmsg_cancel() would cause a crash.

Affected products

• Linux kernel: from 6.14 before 6.18.35; from 6.19 before 7.0.12; 7.1-rc1, 7.1-rc2, 7.1-rc3, 7.1-rc4, 7.1-rc5 — fixed in 6.18.35, 7.0.12

How to fix

Upgrade to a fixed version: Linux kernel 6.18.35, 7.0.12. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2008f9bb1ede9b688624a241228b8e54fc74f0f6
• https://git.kernel.org/stable/c/c3fc9976f686f9a95baf87db9d387f218fd65394
• https://git.kernel.org/stable/c/d0d2c5ccd1de28368cebeef74d9c530a60eff9a5

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