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CVE-2024-50217— btrfs: fix use-after-free of block device file in __btrfs_free_extra_devids()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.8 · High EPSS 0.28% · P19

Possible ATT&CK Techniques 1 AI

T1206

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 142388194191a3edc9ba01cfcfd8b691e0971fb2< 47a83f8df39545f3f552bb6a1b6d9c30e37621dd affected
142388194191a3edc9ba01cfcfd8b691e0971fb2< aec8e6bf839101784f3ef037dcdb9432c3f32343 affected
4.8 affected
< 4.8 unaffected
6.11.7≤ 6.11.* unaffected
6.12≤ * unaffected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 142388194191a3edc9ba01cfcfd8b691e0971fb2 ~ 47a83f8df39545f3f552bb6a1b6d9c30e37621dd -
Linux Linux 4.8 -

II. Public POCs for CVE-2024-50217

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III. Intelligence Information for CVE-2024-50217

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Patches & Fixes for CVE-2024-50217 (2)

Same Patch Batch · Linux · 2024-11-09 · 49 CVEs total

CVE-2024-50215 8.1 HIGH nvmet-auth: assign dh_key to NULL after kfree_sensitive
CVE-2024-50246 7.8 HIGH fs/ntfs3: Add rough attr alloc_size check
CVE-2024-50221 7.8 HIGH drm/amd/pm: Vangogh: Fix kernel memory out of bounds write
CVE-2024-50261 7.8 HIGH macsec: Fix use-after-free while sending the offloading packet
CVE-2024-50225 7.8 HIGH btrfs: fix error propagation of split bios
CVE-2024-50253 7.8 HIGH bpf: Check the validity of nr_words in bpf_iter_bits_new()
CVE-2024-50230 7.8 HIGH nilfs2: fix kernel bug due to missing clearing of checked flag
CVE-2024-50250 7.8 HIGH fsdax: dax_unshare_iter needs to copy entire blocks
CVE-2024-50235 7.8 HIGH wifi: cfg80211: clear wdev->cqm_config pointer on free
CVE-2024-50237 7.8 HIGH wifi: mac80211: do not pass a stopped vif to the driver in .get_txpower
CVE-2024-50262 7.8 HIGH bpf: Fix out-of-bounds write in trie_get_next_key()
CVE-2024-50256 7.5 HIGH netfilter: nf_reject_ipv6: fix potential crash in nf_send_reset6()
CVE-2024-50241 7.5 HIGH NFSD: Initialize struct nfsd4_copy earlier
CVE-2024-50247 7.3 HIGH fs/ntfs3: Check if more than chunk-size bytes are written
CVE-2024-50248 7.1 HIGH ntfs3: Add bounds checking to mi_enum_attr()
CVE-2024-50222 7.0 HIGH iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP
CVE-2024-50257 7.0 HIGH netfilter: Fix use-after-free in get_info()
CVE-2024-50245 fs/ntfs3: Fix possible deadlock in mi_read
CVE-2024-50239 phy: qcom: qmp-usb-legacy: fix NULL-deref on runtime suspend
CVE-2024-50244 fs/ntfs3: Additional check in ni_clear()

Showing top 20 of 49 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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