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CVE-2026-31752 bridge: br_nd_send: validate ND option lengths
Description
In the Linux kernel, the following vulnerability has been resolved: bridge: br_nd_send: validate ND option lengths br_nd_send() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source LLADDR option payload. Validate option lengths against the remaining NS option area before advancing, and only read source LLADDR when the option is large enough for an Ethernet address.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 7.0 | earliest → < 7.0 | 7.0 |
| Linux 6.19 | earliest → < 6.19.12 | 6.19.12 |
| Linux 6.18 | earliest → < 6.18.22 | 6.18.22 |
| Linux 6.12 | earliest → < 6.12.81 | 6.12.81 |
| Linux 6.6 | earliest → < 6.6.134 | 6.6.134 |
| Linux 6.1 | earliest → < 6.1.168 | 6.1.168 |
| Linux 5.15 | earliest → < 5.15.203 | 5.15.203 |
| Linux 5.10 | earliest → < 5.10.253 | 5.10.253 |
| Linux | 4.15 | No fix stated |
Show the 3 other branches Hide the 3 other branches
| Product | Affected versions | Fixed in |
|---|---|---|
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1 | 3.1.7 → latest | No fix stated |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1 | 3.1.7 → latest | No fix stated |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1 | 3.1.7 → latest | No fix stated |
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