VULNERABILITY

Ubuntu: (Multiple Advisories) (CVE-2025-21993): Linux kernel vulnerabilities

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Ubuntu: (Multiple Advisories) (CVE-2025-21993): Linux kernel vulnerabilities

Severity

CVSS

(AV:L/AC:L/Au:S/C:C/I:N/A:C)

Published

04/02/2025

Created

04/25/2025

Added

04/24/2025

Modified

04/30/2025

Description

In the Linux kernel, the following vulnerability has been resolved: iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic() When performing an iSCSI boot using IPv6, iscsistart still reads the /sys/firmware/ibft/ethernetX/subnet-mask entry. Since the IPv6 prefix length is 64, this causes the shift exponent to become negative, triggering a UBSAN warning. As the concept of a subnet mask does not apply to IPv6, the value is set to ~0 to suppress the warning message.

Solution(s)

ubuntu-upgrade-linux-image-5-15-0-1023-nvidia-tegra-igx
ubuntu-upgrade-linux-image-5-15-0-1023-nvidia-tegra-igx-rt
ubuntu-upgrade-linux-image-5-15-0-1035-nvidia-tegra
ubuntu-upgrade-linux-image-5-15-0-1035-nvidia-tegra-rt
ubuntu-upgrade-linux-image-5-15-0-1064-gkeop
ubuntu-upgrade-linux-image-5-15-0-1074-ibm
ubuntu-upgrade-linux-image-5-15-0-1075-intel-iot-realtime
ubuntu-upgrade-linux-image-5-15-0-1076-nvidia
ubuntu-upgrade-linux-image-5-15-0-1076-nvidia-lowlatency
ubuntu-upgrade-linux-image-5-15-0-1076-raspi
ubuntu-upgrade-linux-image-5-15-0-1077-intel-iotg
ubuntu-upgrade-linux-image-5-15-0-1078-kvm
ubuntu-upgrade-linux-image-5-15-0-1079-gke
ubuntu-upgrade-linux-image-5-15-0-1079-oracle
ubuntu-upgrade-linux-image-5-15-0-1081-gcp
ubuntu-upgrade-linux-image-5-15-0-1081-gcp-fips
ubuntu-upgrade-linux-image-5-15-0-1082-aws
ubuntu-upgrade-linux-image-5-15-0-1082-aws-fips
ubuntu-upgrade-linux-image-5-15-0-1082-realtime
ubuntu-upgrade-linux-image-5-15-0-1087-azure
ubuntu-upgrade-linux-image-5-15-0-1087-azure-fde
ubuntu-upgrade-linux-image-5-15-0-1087-azure-fips
ubuntu-upgrade-linux-image-5-15-0-138-fips
ubuntu-upgrade-linux-image-5-15-0-138-generic
ubuntu-upgrade-linux-image-5-15-0-138-generic-64k
ubuntu-upgrade-linux-image-5-15-0-138-generic-lpae
ubuntu-upgrade-linux-image-5-15-0-138-lowlatency
ubuntu-upgrade-linux-image-5-15-0-138-lowlatency-64k
ubuntu-upgrade-linux-image-6-11-0-1008-realtime
ubuntu-upgrade-linux-image-6-11-0-1011-raspi
ubuntu-upgrade-linux-image-6-11-0-1012-aws
ubuntu-upgrade-linux-image-6-11-0-1012-lowlatency
ubuntu-upgrade-linux-image-6-11-0-1012-lowlatency-64k
ubuntu-upgrade-linux-image-6-11-0-1013-azure
ubuntu-upgrade-linux-image-6-11-0-1013-azure-fde
ubuntu-upgrade-linux-image-6-11-0-1013-gcp
ubuntu-upgrade-linux-image-6-11-0-1013-gcp-64k
ubuntu-upgrade-linux-image-6-11-0-1014-oracle
ubuntu-upgrade-linux-image-6-11-0-1014-oracle-64k
ubuntu-upgrade-linux-image-6-11-0-1020-oem
ubuntu-upgrade-linux-image-6-11-0-24-generic
ubuntu-upgrade-linux-image-6-11-0-24-generic-64k
ubuntu-upgrade-linux-image-6-8-0-1010-gkeop
ubuntu-upgrade-linux-image-6-8-0-1014-azure-nvidia
ubuntu-upgrade-linux-image-6-8-0-1023-gke
ubuntu-upgrade-linux-image-6-8-0-1024-ibm
ubuntu-upgrade-linux-image-6-8-0-1024-oracle
ubuntu-upgrade-linux-image-6-8-0-1024-oracle-64k
ubuntu-upgrade-linux-image-6-8-0-1026-nvidia
ubuntu-upgrade-linux-image-6-8-0-1026-nvidia-64k
ubuntu-upgrade-linux-image-6-8-0-1026-nvidia-lowlatency
ubuntu-upgrade-linux-image-6-8-0-1026-nvidia-lowlatency-64k
ubuntu-upgrade-linux-image-6-8-0-1026-oem
ubuntu-upgrade-linux-image-6-8-0-1027-aws
ubuntu-upgrade-linux-image-6-8-0-1027-azure
ubuntu-upgrade-linux-image-6-8-0-1027-azure-fde
ubuntu-upgrade-linux-image-6-8-0-1028-gcp
ubuntu-upgrade-linux-image-6-8-0-1028-gcp-64k
ubuntu-upgrade-linux-image-6-8-0-58-generic
ubuntu-upgrade-linux-image-6-8-0-58-generic-64k
ubuntu-upgrade-linux-image-6-8-0-58-lowlatency
ubuntu-upgrade-linux-image-6-8-0-58-lowlatency-64k
ubuntu-upgrade-linux-image-6-8-1-1020-realtime
ubuntu-upgrade-linux-image-aws
ubuntu-upgrade-linux-image-aws-fips
ubuntu-upgrade-linux-image-aws-lts-22-04
ubuntu-upgrade-linux-image-aws-lts-24-04
ubuntu-upgrade-linux-image-azure
ubuntu-upgrade-linux-image-azure-cvm
ubuntu-upgrade-linux-image-azure-fde
ubuntu-upgrade-linux-image-azure-fde-lts-22-04
ubuntu-upgrade-linux-image-azure-fde-lts-24-04
ubuntu-upgrade-linux-image-azure-fips
ubuntu-upgrade-linux-image-azure-lts-22-04
ubuntu-upgrade-linux-image-azure-lts-24-04
ubuntu-upgrade-linux-image-azure-nvidia
ubuntu-upgrade-linux-image-fips
ubuntu-upgrade-linux-image-gcp
ubuntu-upgrade-linux-image-gcp-64k
ubuntu-upgrade-linux-image-gcp-64k-lts-24-04
ubuntu-upgrade-linux-image-gcp-fips
ubuntu-upgrade-linux-image-gcp-lts-22-04
ubuntu-upgrade-linux-image-gcp-lts-24-04
ubuntu-upgrade-linux-image-generic
ubuntu-upgrade-linux-image-generic-64k
ubuntu-upgrade-linux-image-generic-64k-hwe-20-04
ubuntu-upgrade-linux-image-generic-64k-hwe-22-04
ubuntu-upgrade-linux-image-generic-64k-hwe-24-04
ubuntu-upgrade-linux-image-generic-hwe-20-04
ubuntu-upgrade-linux-image-generic-hwe-22-04
ubuntu-upgrade-linux-image-generic-hwe-24-04
ubuntu-upgrade-linux-image-generic-lpae
ubuntu-upgrade-linux-image-generic-lpae-hwe-20-04
ubuntu-upgrade-linux-image-gke
ubuntu-upgrade-linux-image-gke-5-15
ubuntu-upgrade-linux-image-gkeop
ubuntu-upgrade-linux-image-gkeop-5-15
ubuntu-upgrade-linux-image-gkeop-6-8
ubuntu-upgrade-linux-image-ibm
ubuntu-upgrade-linux-image-ibm-classic
ubuntu-upgrade-linux-image-ibm-lts-24-04
ubuntu-upgrade-linux-image-intel
ubuntu-upgrade-linux-image-intel-iot-realtime
ubuntu-upgrade-linux-image-intel-iotg
ubuntu-upgrade-linux-image-kvm
ubuntu-upgrade-linux-image-lowlatency
ubuntu-upgrade-linux-image-lowlatency-64k
ubuntu-upgrade-linux-image-lowlatency-64k-hwe-20-04
ubuntu-upgrade-linux-image-lowlatency-64k-hwe-22-04
ubuntu-upgrade-linux-image-lowlatency-64k-hwe-24-04
ubuntu-upgrade-linux-image-lowlatency-hwe-20-04
ubuntu-upgrade-linux-image-lowlatency-hwe-22-04
ubuntu-upgrade-linux-image-lowlatency-hwe-24-04
ubuntu-upgrade-linux-image-nvidia
ubuntu-upgrade-linux-image-nvidia-6-8
ubuntu-upgrade-linux-image-nvidia-64k
ubuntu-upgrade-linux-image-nvidia-64k-6-8
ubuntu-upgrade-linux-image-nvidia-64k-hwe-22-04
ubuntu-upgrade-linux-image-nvidia-hwe-22-04
ubuntu-upgrade-linux-image-nvidia-lowlatency
ubuntu-upgrade-linux-image-nvidia-lowlatency-64k
ubuntu-upgrade-linux-image-nvidia-tegra
ubuntu-upgrade-linux-image-nvidia-tegra-igx
ubuntu-upgrade-linux-image-nvidia-tegra-igx-rt
ubuntu-upgrade-linux-image-nvidia-tegra-rt
ubuntu-upgrade-linux-image-oem-20-04
ubuntu-upgrade-linux-image-oem-20-04b
ubuntu-upgrade-linux-image-oem-20-04c
ubuntu-upgrade-linux-image-oem-20-04d
ubuntu-upgrade-linux-image-oem-22-04
ubuntu-upgrade-linux-image-oem-22-04a
ubuntu-upgrade-linux-image-oem-22-04b
ubuntu-upgrade-linux-image-oem-22-04c
ubuntu-upgrade-linux-image-oem-22-04d
ubuntu-upgrade-linux-image-oem-24-04
ubuntu-upgrade-linux-image-oem-24-04a
ubuntu-upgrade-linux-image-oem-24-04b
ubuntu-upgrade-linux-image-oracle
ubuntu-upgrade-linux-image-oracle-64k
ubuntu-upgrade-linux-image-oracle-64k-lts-24-04
ubuntu-upgrade-linux-image-oracle-lts-22-04
ubuntu-upgrade-linux-image-oracle-lts-24-04
ubuntu-upgrade-linux-image-raspi
ubuntu-upgrade-linux-image-raspi-nolpae
ubuntu-upgrade-linux-image-realtime
ubuntu-upgrade-linux-image-realtime-hwe-24-04
ubuntu-upgrade-linux-image-virtual
ubuntu-upgrade-linux-image-virtual-hwe-20-04
ubuntu-upgrade-linux-image-virtual-hwe-22-04
ubuntu-upgrade-linux-image-virtual-hwe-24-04

References

https://attackerkb.com/topics/cve-2025-21993
CVE - 2025-21993
USN-7445-1
USN-7448-1
USN-7449-1
USN-7449-2
USN-7450-1
USN-7451-1
USN-7452-1
USN-7453-1
USN-7455-1
USN-7455-2
USN-7455-3
USN-7455-4
USN-7455-5
USN-7459-1
USN-7459-2
USN-7460-1
USN-7468-1
https://git.kernel.org/linus/07e0d99a2f701123ad3104c0f1a1e66bce74d6e5
https://git.kernel.org/stable/c/07e0d99a2f701123ad3104c0f1a1e66bce74d6e5
https://git.kernel.org/stable/c/2d1eef248107bdf3d5a69d0fde04c30a79a7bf5d
https://git.kernel.org/stable/c/9bfa80c8aa4e06dff55a953c3fffbfc68a3a3b1c
https://git.kernel.org/stable/c/b253660fac5e0e9080d2c95e3a029e1898d49afb
https://git.kernel.org/stable/c/c1c6e527470e5eab0b2d57bd073530fbace39eab
https://ubuntu.com/security/notices/USN-7445-1
https://ubuntu.com/security/notices/USN-7448-1
https://ubuntu.com/security/notices/USN-7449-1
https://ubuntu.com/security/notices/USN-7450-1
https://ubuntu.com/security/notices/USN-7451-1
https://ubuntu.com/security/notices/USN-7452-1
https://ubuntu.com/security/notices/USN-7453-1
https://www.cve.org/CVERecord?id=CVE-2025-21993

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VULNERABILITY

Ubuntu: (Multiple Advisories) (CVE-2025-21993): Linux kernel vulnerabilities

Ubuntu: (Multiple Advisories) (CVE-2025-21993): Linux kernel vulnerabilities

Description

Solution(s)

References

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