Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: xfrm_user: fix info leak in build_mapping() struct xfrm_usersa_id has a one-byte padding hole after the proto field, which ends up never getting set to zero before copying out to userspace. Fix that up by zeroing out the whole structure before setting individual variables.

Affected versions

Linux: 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 through before 521385cbd50ca9474396d88462fcdfa6489685d9 (git); 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 through before c2779ae9a3e5a044e5ccd564681511bbbcc5fc0f (git); 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 through before 72a8de41c3eb4dcf22bf3b674ea38fb2f75d6f32 (git); 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 through before d3125c541a96fb3c0fc7210112684baf22b6c24d (git); 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 through before 5a1a4b049ddde41466ccac0daeec326254b133f2 (git); 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 through before f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c (git); 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 through before 700c9622b23c33b5933e6dcea816492c064e4e10 (git); 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 through before 1beb76b2053b68c491b78370794b8ff63c8f8c02 (git); 2.6.29; V3.1.6 through before * (custom) Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.