Ubuntu: (Multiple Advisories) (CVE-2024-47740): Linux kernel vulnerabilities
Description
In the Linux kernel, the following vulnerability has been resolved: f2fs: Require FMODE_WRITE for atomic write ioctls The F2FS ioctls for starting and committing atomic writes check for inode_owner_or_capable(), but this does not give LSMs like SELinux or Landlock an opportunity to deny the write access - if the caller's FSUID matches the inode's UID, inode_owner_or_capable() immediately returns true. There are scenarios where LSMs want to deny a process the ability to write particular files, even files that the FSUID of the process owns; but this can currently partially be bypassed using atomic write ioctls in two ways: - F2FS_IOC_START_ATOMIC_REPLACE + F2FS_IOC_COMMIT_ATOMIC_WRITE can truncate an inode to size 0 - F2FS_IOC_START_ATOMIC_WRITE + F2FS_IOC_ABORT_ATOMIC_WRITE can revert changes another process concurrently made to a file Fix it by requiring FMODE_WRITE for these operations, just like for F2FS_IOC_MOVE_RANGE. Since any legitimate caller should only be using these ioctls when intending to write into the file, that seems unlikely to break anything.
Solution(s)
- ubuntu-upgrade-linux-image-5-15-0-1056-gkeop
- ubuntu-upgrade-linux-image-5-15-0-1066-ibm
- ubuntu-upgrade-linux-image-5-15-0-1066-raspi
- ubuntu-upgrade-linux-image-5-15-0-1068-nvidia
- ubuntu-upgrade-linux-image-5-15-0-1068-nvidia-lowlatency
- ubuntu-upgrade-linux-image-5-15-0-1070-gke
- ubuntu-upgrade-linux-image-5-15-0-1070-kvm
- ubuntu-upgrade-linux-image-5-15-0-1071-intel-iotg
- ubuntu-upgrade-linux-image-5-15-0-1071-oracle
- ubuntu-upgrade-linux-image-5-15-0-1072-gcp
- ubuntu-upgrade-linux-image-5-15-0-1073-aws
- ubuntu-upgrade-linux-image-5-15-0-127-generic
- ubuntu-upgrade-linux-image-5-15-0-127-generic-64k
- ubuntu-upgrade-linux-image-5-15-0-127-generic-lpae
- ubuntu-upgrade-linux-image-5-15-0-127-lowlatency
- ubuntu-upgrade-linux-image-5-15-0-127-lowlatency-64k
- ubuntu-upgrade-linux-image-aws
- ubuntu-upgrade-linux-image-aws-lts-22-04
- ubuntu-upgrade-linux-image-gcp
- ubuntu-upgrade-linux-image-gcp-lts-22-04
- 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-hwe-20-04
- 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-ibm
- 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-hwe-20-04
- ubuntu-upgrade-linux-image-nvidia
- ubuntu-upgrade-linux-image-nvidia-lowlatency
- 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-oracle
- ubuntu-upgrade-linux-image-oracle-lts-22-04
- ubuntu-upgrade-linux-image-raspi
- ubuntu-upgrade-linux-image-raspi-nolpae
- ubuntu-upgrade-linux-image-virtual
- ubuntu-upgrade-linux-image-virtual-hwe-20-04
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