Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_meta_bridge: fix stale stack leak via IIFHWADDR register NFT_META_BRI_IIFHWADDR declares its destination register with len = ETH_ALEN (6 bytes), which the register-init tracking rounds up to two 32-bit registers (8 bytes). nft_meta_bridge_get_eval() then does memcpy(dest, br_dev->dev_addr, ETH_ALEN), writing only 6 bytes and leaving the upper 2 bytes of the second register as uninitialised nft_do_chain() stack. A downstream load of that register span leaks those stale bytes to userspace. Zero the second register before the memcpy so the full declared span is written.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected cbd2257dc96e3e46217540fcb095a757ffa20d96 before 07acb9798477535933bd658ac9fa85b6cb10d995; affected cbd2257dc96e3e46217540fcb095a757ffa20d96 before f1e81d571e375d10e50e852223593493d98c1bac; affected cbd2257dc96e3e46217540fcb095a757ffa20d96 before c7d573551f9286100a055ef696cde6af54549677 |
| Linux / Linux | affected 6.18; unaffected 0 before 6.18; unaffected 6.18.36 through 6.18.*; unaffected 7.0.13 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.