What’s Vulnerable › Vulnerabilities

CVE-2026-81007: ipmi: ipmb: validate write message length

• Severity: high (CVSS 7.1 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: 2026-09-11 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: ipmi: ipmb: validate write message length ipmb_write() read message fields before validating the length byte. A zero or short write can read uninitialized stack bytes. A length smaller than the SMBus header underflows the block write length. Require a non-empty buffer and the minimum IPMB request length. Also require the length byte plus payload before parsing the message.

Affected products

• Linux kernel: 5.3 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/53637506884dbd5c91a89b1a3547d99d80f8ed2c
• https://git.kernel.org/stable/c/5719431ca2b5fa26560bb38f6202f8b97fa3bbb0
• https://git.kernel.org/stable/c/60939bcda6f3f104ef456fdbf3cc5733c0720fb1
• https://git.kernel.org/stable/c/7d66d54b974cff0a959e188af844d2d110422767
• https://git.kernel.org/stable/c/8990c7f6bfc1e7689b7012a7d4d0efb9f07a9c89
• https://git.kernel.org/stable/c/94f8d20153e348c79bc14dc25f873470518892da
• https://git.kernel.org/stable/c/a84c6e3d188f2c6e674910929eb790634299d6d5
• https://git.kernel.org/stable/c/e527cd4e80066e1ed070fdc7c705bde340cdcc62

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