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CVE-2024-39463— 9p: add missing locking around taking dentry fid list

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 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 154372e67d4053e56591245eb413686621941333< 3bb6763a8319170c2d41c4232c8e7e4c37dcacfb affected
154372e67d4053e56591245eb413686621941333< cb299cdba09f46f090b843d78ba26b667d50a456 affected
154372e67d4053e56591245eb413686621941333< f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5 affected
154372e67d4053e56591245eb413686621941333< fe17ebf22feb4ad7094d597526d558a49aac92b4 affected
154372e67d4053e56591245eb413686621941333< c898afdc15645efb555acb6d85b484eb40a45409 affected
5.11 affected
< 5.11 unaffected
5.15.168≤ 5.15.* unaffected
… +4 more rows
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I. Basic Information for CVE-2024-39463

Vulnerability Information
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Vulnerability Title
9p: add missing locking around taking dentry fid list
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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 154372e67d4053e56591245eb413686621941333 ~ 3bb6763a8319170c2d41c4232c8e7e4c37dcacfb -
Linux Linux 5.11 -

II. Public POCs for CVE-2024-39463

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III. Intelligence Information for CVE-2024-39463

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Other References for CVE-2024-39463 (5)

Same Patch Batch · Linux · 2024-06-25 · 24 CVEs total

CVE-2024-39293 9.8 CRITICAL Revert "xsk: Support redirect to any socket bound to the same umem"
CVE-2024-39471 7.8 HIGH drm/amdgpu: add error handle to avoid out-of-bounds
CVE-2024-37354 7.8 HIGH btrfs: fix crash on racing fsync and size-extending write into prealloc
CVE-2024-37078 7.8 HIGH nilfs2: fix potential kernel bug due to lack of writeback flag waiting
CVE-2024-38306 7.8 HIGH btrfs: protect folio::private when attaching extent buffer folios
CVE-2024-38385 7.8 HIGH genirq/irqdesc: Prevent use-after-free in irq_find_at_or_after()
CVE-2024-39467 7.8 HIGH f2fs: fix to do sanity check on i_xattr_nid in sanity_check_inode()
CVE-2024-39468 7.5 HIGH smb: client: fix deadlock in smb2_find_smb_tcon()
CVE-2024-39469 7.1 HIGH nilfs2: fix nilfs_empty_dir() misjudgment and long loop on I/O errors
CVE-2024-39301 net/9p: fix uninit-value in p9_client_rpc()
CVE-2024-39470 eventfs: Fix a possible null pointer dereference in eventfs_find_events()
CVE-2024-39466 thermal/drivers/qcom/lmh: Check for SCM availability at probe
CVE-2024-39464 media: v4l: async: Fix notifier list entry init
CVE-2024-39465 media: mgb4: Fix double debugfs remove
CVE-2024-39462 clk: bcm: dvp: Assign ->num before accessing ->hws
CVE-2024-39461 clk: bcm: rpi: Assign ->num before accessing ->hws
CVE-2024-39371 io_uring: check for non-NULL file pointer in io_file_can_poll()
CVE-2021-4440 x86/xen: Drop USERGS_SYSRET64 paravirt call
CVE-2024-39298 mm/memory-failure: fix handling of dissolved but not taken off from buddy pages
CVE-2024-39296 bonding: fix oops during rmmod

Showing top 20 of 24 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-39463

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