Linux kernel vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
Summary
Several security issues were fixed in the kernel.
Software Description
- linux - Linux kernel
- linux-aws - Linux kernel for Amazon Web Services (AWS) systems
- linux-azure - Linux kernel for Microsoft Azure Cloud systems
- linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke - Linux kernel for Google Container Engine (GKE) systems
- linux-ibm - Linux kernel for IBM cloud systems
- linux-oracle - Linux kernel for Oracle Cloud systems
Details
In the Linux kernel, the following vulnerability has been resolved: KVM:
arm64: Tear down vGIC on failed vCPU creation If kvm_arch_vcpu_create()
fails to share the vCPU page with the hypervisor, we propagate the error
back to the ioctl but leave the vGIC vCPU data initialised.
(CVE-2025-37849)
In the Linux kernel, the following vulnerability has been resolved:
nvmet-tcp: add bounds checks in nvmet_tcp_build_pdu_iovec
nvmet_tcp_build_pdu_iovec() could walk past cmd->req.sg when a PDU
length or offset exceeds sg_cnt and then use bogus sg->length/offset
values, leading to _copy_to_iter() GPF/KASAN. (CVE-2026-23112)
It was discovered that the Linux kernel algif_aead module did not
properly handle in-place cryptographic operations. This flaw is known as
Copy Fail. A local attacker could use this to escalate privileges, or
possibly escape a container. (CVE-2026-31431)
Update instructions
The problem can be corrected by updating your kernel livepatch to the
following versions:
Ubuntu 20.04 LTS
aws - 120.2
azure - 120.2
gcp - 120.2
generic - 120.2
ibm - 120.2
lowlatency - 120.2
oracle - 120.2
Ubuntu 18.04 LTS
aws - 120.2
azure - 120.2
gcp - 120.2
generic - 120.2
lowlatency - 120.2
oracle - 120.2
Ubuntu 24.04 LTS
aws - 120.2
azure - 120.2
gcp - 120.2
generic - 120.2
ibm - 120.2
oracle - 120.2
Ubuntu 22.04 LTS
aws - 120.2
azure - 120.2
gcp - 120.2
generic - 120.2
gke - 120.2
ibm - 120.2
oracle - 120.2
Support Information
Livepatches for supported LTS kernels will receive upgrades for a period
of up to 13 months after the build date of the kernel.
Livepatches for supported HWE kernels which are not based on an LTS
kernel version will receive upgrades for a period of up to 9 months
after the build date of the kernel, or until the end of support for that
kernel’s non-LTS distro release version, whichever is sooner.
References
- CVE-2025-37849
- CVE-2026-23112
- CVE-2026-31431
