CVE-2019-19039
Description
__btrfs_free_extent in fs/btrfs/extent-tree.c in the Linux kernel through 5.3.12 calls btrfs_print_leaf in a certain ENOENT case, which allows local users to obtain potentially sensitive information about register values via the dmesg program. NOTE: The BTRFS development team disputes this issues as not being a vulnerability because “1) The kernel provide facilities to restrict access to dmesg - dmesg_restrict=1 sysctl option. So it's really up to the system administrator to judge whether dmesg access shall be disallowed or not. 2) WARN/WARN_ON are widely used macros in the linux kernel. If this CVE is considered valid this would mean there are literally thousands CVE lurking in the kernel - something which clearly is not the case.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2019-19039
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2019-19039.html
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 5.6.7-1 |
| debian | bullseye | fixed | 5.6.7-1 |
| debian | forky | fixed | 5.6.7-1 |
| debian | sid | fixed | 5.6.7-1 |
| debian | trixie | fixed | 5.6.7-1 |
References
Verify integrity in audit chain (admin only). AS-IS.