Description
A flaw was found in the crypto subsystem of the Linux kernel before version kernel-4.15-rc4. The "null skcipher" was being dropped when each af_alg_ctx was freed instead of when the aead_tfm was freed. This can cause the null skcipher to be freed while it is still in use leading to a local user being able to crash the system or possibly escalate privileges.
CVSS breakdown
CVSS 3.0
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected products
- Unknown / kernelkernel-4.15-rc4 – kernel-4.15-rc4
References
- MISChttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b32a7dc8aef1882fbf983eb354837488cc9d54dc
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2018:2948
- VENDOR_ADVISORYhttps://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0013
- MISChttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14619
- MISChttp://www.securityfocus.com/bid/105200