Ubuntu: (Multiple Advisories) (CVE-2024-39463): Linux kernel vulnerabilities
Description
In the Linux kernel, the following vulnerability has been resolved: 9p: add missing locking around taking dentry fid list Fix a use-after-free on dentry's d_fsdata fid list when a thread looks up a fid through dentry while another thread unlinks it: UAF thread: refcount_t: addition on 0; use-after-free. p9_fid_get linux/./include/net/9p/client.h:262 v9fs_fid_find+0x236/0x280 linux/fs/9p/fid.c:129 v9fs_fid_lookup_with_uid linux/fs/9p/fid.c:181 v9fs_fid_lookup+0xbf/0xc20 linux/fs/9p/fid.c:314 v9fs_vfs_getattr_dotl+0xf9/0x360 linux/fs/9p/vfs_inode_dotl.c:400 vfs_statx+0xdd/0x4d0 linux/fs/stat.c:248 Freed by: p9_fid_destroy (inlined) p9_client_clunk+0xb0/0xe0 linux/net/9p/client.c:1456 p9_fid_put linux/./include/net/9p/client.h:278 v9fs_dentry_release+0xb5/0x140 linux/fs/9p/vfs_dentry.c:55 v9fs_remove+0x38f/0x620 linux/fs/9p/vfs_inode.c:518 vfs_unlink+0x29a/0x810 linux/fs/namei.c:4335 The problem is that d_fsdata was not accessed under d_lock, because d_release() normally is only called once the dentry is otherwise no longer accessible but since we also call it explicitly in v9fs_remove that lock is required: move the hlist out of the dentry under lock then unref its fids once they are no longer accessible.
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-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-6-8-0-1010-gke
- ubuntu-upgrade-linux-image-6-8-0-1011-raspi
- ubuntu-upgrade-linux-image-6-8-0-1012-ibm
- ubuntu-upgrade-linux-image-6-8-0-1012-oem
- ubuntu-upgrade-linux-image-6-8-0-1012-oracle
- ubuntu-upgrade-linux-image-6-8-0-1012-oracle-64k
- ubuntu-upgrade-linux-image-6-8-0-1013-nvidia
- ubuntu-upgrade-linux-image-6-8-0-1013-nvidia-64k
- ubuntu-upgrade-linux-image-6-8-0-1013-nvidia-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-1013-nvidia-lowlatency-64k
- ubuntu-upgrade-linux-image-6-8-0-1014-azure
- ubuntu-upgrade-linux-image-6-8-0-1014-azure-fde
- ubuntu-upgrade-linux-image-6-8-0-1014-gcp
- ubuntu-upgrade-linux-image-6-8-0-1015-aws
- ubuntu-upgrade-linux-image-6-8-0-44-generic
- ubuntu-upgrade-linux-image-6-8-0-44-generic-64k
- ubuntu-upgrade-linux-image-6-8-0-44-lowlatency
- ubuntu-upgrade-linux-image-6-8-0-44-lowlatency-64k
- ubuntu-upgrade-linux-image-6-8-0-45-generic
- ubuntu-upgrade-linux-image-6-8-0-45-generic-64k
- ubuntu-upgrade-linux-image-aws
- ubuntu-upgrade-linux-image-aws-lts-22-04
- ubuntu-upgrade-linux-image-azure
- ubuntu-upgrade-linux-image-azure-fde
- 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-22-04
- ubuntu-upgrade-linux-image-generic-64k-hwe-24-04
- 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-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-ibm-classic
- ubuntu-upgrade-linux-image-ibm-lts-24-04
- 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-hwe-20-04
- ubuntu-upgrade-linux-image-lowlatency-hwe-22-04
- 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-lowlatency
- ubuntu-upgrade-linux-image-nvidia-lowlatency-64k
- 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-oracle
- ubuntu-upgrade-linux-image-oracle-64k
- 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-22-04
- ubuntu-upgrade-linux-image-virtual-hwe-24-04
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