Information disclosure in Linux kernel - CVE-2019-7308
Published: February 4, 2019
Vulnerability identifier: #VU17367
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-7308
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to out-of-bounds speculation on pointer arithmetic in various cases in kernel/bpf/verifier.c, including cases of different branches with different state or limits to sanitize. A remote attacker can gain unauthorized access to sensitive information on the system.
Affected software
Linux kernel
Amazon Linux AMI
Opensuse
Fedora
kernel
kernel-headers
Amazon Linux AMI
Opensuse
Fedora
kernel
kernel-headers
How to mitigate CVE-2019-7308
Install updates from vendor's website.
Linux kernel - update to 4.20.6
kernel - addressed in versions 4.20.6-100.fc28, 4.20.6-200.fc29
kernel-headers - addressed in versions 4.20.6-100.fc28, 4.20.6-200.fc29
kernel - addressed in versions 4.20.6-100.fc28, 4.20.6-200.fc29
kernel-headers - addressed in versions 4.20.6-100.fc28, 4.20.6-200.fc29
External References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=979d63d50c0c0f7bc537bf821e056cc9fe5abd38
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d3bd7413e0ca40b60cf60d4003246d067cafdeda
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.6
- https://github.com/torvalds/linux/commit/979d63d50c0c0f7bc537bf821e056cc9fe5abd38
- https://github.com/torvalds/linux/commit/d3bd7413e0ca40b60cf60d4003246d067cafdeda