CVE-2025-39717: linux kernel from 6.15 (inclusive), before 6.16.4 (exclusive), 6.17 · update rc1, 6.17 · update rc2; +1 more affected…

Affected technology

linux kernel · from 6.15 (inclusive), before 6.16.4 (exclusive)
linux

linux kernel · 6.17 · update rc1
linux

linux kernel · 6.17 · update rc2
linux

Linux · 2462651ffa76b87f9c2e4403ef6e6b89b703fb2f to before 69dbdc711d9130136824e3830191a6afffa0a1f0, 2462651ffa76b87f9c2e4403ef6e6b89b703fb2f to before 9308366f062129d52e0ee3f7a019f7dd41db33df
Linux

Linux · 6.15
Linux

Component: Not specified by the source
File: fs/namespace.c

Attack conditions (Source advisory, CVSS 3.1): Local · Low privileges required · No user interaction required

Attack conditions (NVD, CVSS 3.1): Local · Low privileges required · No user interaction required

What an attacker can do

Changing idmappings") which allowed users can bypass this restriction by calling open_tree_attr(2) *without* OPEN_TREE_CLONE. can_idmap_mount() prevented this bug from allowing an attached mountpoint's id-mapping from being modified (thanks to an is_anon_ns() check), but this still allows for detached (but visible) mounts to have their be id-mapping changed. Source advisory’s CVSS 3.1 assessment (base score 7.8/10) rates confidentiality, integrity and availability impact as high. NVD’s CVSS 3.1 assessment (base score 7.8/10) rates confidentiality, integrity and availability impact as high.