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CVE-2026-63987: ethtool: coalesce: cap profile updates at NET_DIM_PARAMS_NUM_PROFILES

• Severity: high (CVSS 7.8 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 2026-10-19
• Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: ethtool: coalesce: cap profile updates at NET_DIM_PARAMS_NUM_PROFILES ethnl_update_profile() walks the ETHTOOL_A_PROFILE_IRQ_MODERATION nest list with an index 'i' and writes new_profile[i++] without bounding i. The destination is kmemdup()'d at NET_DIM_PARAMS_NUM_PROFILES entries (5), but the Netlink nest count is entirely user-controlled. Netlink policies do not have support for constraining the number of nested entries (or number of multi-attr entries).

Affected products

• Linux kernel: from 6.11 before 6.12.93; from 6.13 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 6.12.93, 6.18.35, 7.0.12

How to fix

Upgrade to a fixed version: Linux kernel 6.12.93, 6.18.35, 7.0.12. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0c02c190bcd9822477038ff2cee10ea584ac1b1d
• https://git.kernel.org/stable/c/6205f7166d2dd14a017a5802c81e5bd1421a8635
• https://git.kernel.org/stable/c/7281b096b072f6c6e30420e3467d738f2e4c4b57
• https://git.kernel.org/stable/c/d4c9cc7c47781c6f4fa29d80a1193a8bcd1525bc

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