CVE-2025-40159

Description

In the Linux kernel, the following vulnerability has been resolved:xsk: Harden userspace-supplied xdp_desc validationTurned out certain clearly invalid values passed in xdp_desc fromuserspace can pass xp_{,un}aligned_validate_desc() and then leadto UBs or just invalid frames to be queued for xmit.desc->len close to U32_MAX with a non-zero pool->tx_metadata_lencan cause positive integer overflow and wraparound, the same way lowenough desc->addr with a non-zero pool->tx_metadata_len can causenegative integer overflow. Both scenarios can then pass thevalidation successfully.This doesnt happen with valid XSk applications, but can be usedto perform attacks.Always promote desc->len to u64 first to exclude positiveoverflows of it. Use explicit check_{add,sub}_overflow() whenvalidating desc->addr (which is u64 already).bloat-o-meter reports a little growth of the code size:add/remove: 0/0 grow/shrink: 2/1 up/down: 60/-16 (44)Function old new deltaxskq_cons_peek_desc 299 330 +31xsk_tx_peek_release_desc_batch 973 1002 +29xsk_generic_xmit 3148 3132 -16but hopefully this doesnt hurt the performance much.

Risk Information

Associated Vulnerability

Patch Details

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234