CVE-2024-50217— btrfs: fix use-after-free of block device file in __btrfs_free_extra_devids()
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I. Basic Information for CVE-2024-50217
Vulnerability Information
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Vulnerability Title
btrfs: fix use-after-free of block device file in __btrfs_free_extra_devids()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free of block device file in __btrfs_free_extra_devids() Mounting btrfs from two images (which have the same one fsid and two different dev_uuids) in certain executing order may trigger an UAF for variable 'device->bdev_file' in __btrfs_free_extra_devids(). And following are the details: 1. Attach image_1 to loop0, attach image_2 to loop1, and scan btrfs devices by ioctl(BTRFS_IOC_SCAN_DEV): / btrfs_device_1 → loop0 fs_device \ btrfs_device_2 → loop1 2. mount /dev/loop0 /mnt btrfs_open_devices btrfs_device_1->bdev_file = btrfs_get_bdev_and_sb(loop0) btrfs_device_2->bdev_file = btrfs_get_bdev_and_sb(loop1) btrfs_fill_super open_ctree fail: btrfs_close_devices // -ENOMEM btrfs_close_bdev(btrfs_device_1) fput(btrfs_device_1->bdev_file) // btrfs_device_1->bdev_file is freed btrfs_close_bdev(btrfs_device_2) fput(btrfs_device_2->bdev_file) 3. mount /dev/loop1 /mnt btrfs_open_devices btrfs_get_bdev_and_sb(&bdev_file) // EIO, btrfs_device_1->bdev_file is not assigned, // which points to a freed memory area btrfs_device_2->bdev_file = btrfs_get_bdev_and_sb(loop1) btrfs_fill_super open_ctree btrfs_free_extra_devids if (btrfs_device_1->bdev_file) fput(btrfs_device_1->bdev_file) // UAF ! Fix it by setting 'device->bdev_file' as 'NULL' after closing the btrfs_device in btrfs_close_one_device().
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于内存释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2024-50217
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Same Patch Batch · Linux · 2024-11-09 · 49 CVEs total
| CVE-2024-50249 | ACPI: CPPC: Make rmw_lock a raw_spin_lock | |
| CVE-2024-50252 | mlxsw: spectrum_ipip: Fix memory leak when changing remote IPv6 address | |
| CVE-2024-50254 | bpf: Free dynamically allocated bits in bpf_iter_bits_destroy() | |
| CVE-2024-50258 | net: fix crash when config small gso_max_size/gso_ipv4_max_size | |
| CVE-2024-50259 | netdevsim: Add trailing zero to terminate the string in nsim_nexthop_bucket_activity_write | |
| CVE-2024-50260 | sock_map: fix a NULL pointer dereference in sock_map_link_update_prog() | |
| CVE-2024-50261 | macsec: Fix use-after-free while sending the offloading packet | |
| CVE-2024-50262 | bpf: Fix out-of-bounds write in trie_get_next_key() | |
| CVE-2024-50257 | netfilter: Fix use-after-free in get_info() | |
| CVE-2024-50250 | fsdax: dax_unshare_iter needs to copy entire blocks | |
| CVE-2024-50251 | netfilter: nft_payload: sanitize offset and length before calling skb_checksum() | |
| CVE-2024-50248 | ntfs3: Add bounds checking to mi_enum_attr() | |
| CVE-2024-50247 | fs/ntfs3: Check if more than chunk-size bytes are written | |
| CVE-2024-50246 | fs/ntfs3: Add rough attr alloc_size check | |
| CVE-2024-50244 | fs/ntfs3: Additional check in ni_clear() | |
| CVE-2024-50245 | fs/ntfs3: Fix possible deadlock in mi_read | |
| CVE-2024-50243 | fs/ntfs3: Fix general protection fault in run_is_mapped_full | |
| CVE-2024-50242 | fs/ntfs3: Additional check in ntfs_file_release | |
| CVE-2024-50241 | NFSD: Initialize struct nfsd4_copy earlier | |
| CVE-2024-50240 | phy: qcom: qmp-usb: fix NULL-deref on runtime suspend |
Showing top 20 of 49 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
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