High
Canonical Ubuntu
It was discovered that the overlayfs implementation in the Linux kernel did not properly validate the application of file system capabilities with respect to user namespaces. A local attacker could use this to gain elevated privileges. (CVE-2021-3493)
Piotr Krysiuk discovered that the BPF JIT compiler for x86 in the Linux kernel did not properly validate computation of branch displacements in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-29154)
CVEs contained in this USN include: CVE-2021-29154, CVE-2021-3493.
Severity is high unless otherwise noted.
Users of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases:
2021-04-29: Initial vulnerability report published.
CPE | Name | Operator | Version |
---|---|---|---|
xenial stemcells | lt | 456.158 | |
xenial stemcells | lt | 621.123 |