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CVE-2024-39276— ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find()

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，该漏洞源于引用计数泄漏。

AI Predicted 5.5 Difficulty: Theoretical EPSS 0.23% · P14

Affected Version Matrix 23

VendorProduct Version RangeStatus
Linux Linux b878c8a7f08f0c225b6a46ba1ac867e9c5d17807< 9ad75e78747b5a50dc5a52f0f8e92e920a653f16 affected
fb265c9cb49e2074ddcdd4de99728aefdd3b3592< 896a7e7d0d555ad8b2b46af0c2fa7de7467f9483 affected
fb265c9cb49e2074ddcdd4de99728aefdd3b3592< 76dc776153a47372719d664e0fc50d6355791abb affected
fb265c9cb49e2074ddcdd4de99728aefdd3b3592< 681ff9a09accd8a4379f8bd30b7a1641ee19bb3e affected
fb265c9cb49e2074ddcdd4de99728aefdd3b3592< e941b712e758f615d311946bf98216e79145ccd9 affected
fb265c9cb49e2074ddcdd4de99728aefdd3b3592< a95df6f04f2c37291adf26a74205cde0314d4577 affected
fb265c9cb49e2074ddcdd4de99728aefdd3b3592< b37c0edef4e66fb21a2fbc211471195a383e5ab8 affected
fb265c9cb49e2074ddcdd4de99728aefdd3b3592< 0c0b4a49d3e7f49690a6827a41faeffad5df7e21 affected
… +15 more rows
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I. Basic Information for CVE-2024-39276

Vulnerability Information
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Vulnerability Title
ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find() Syzbot reports a warning as follows: ============================================ WARNING: CPU: 0 PID: 5075 at fs/mbcache.c:419 mb_cache_destroy+0x224/0x290 Modules linked in: CPU: 0 PID: 5075 Comm: syz-executor199 Not tainted 6.9.0-rc6-gb947cc5bf6d7 RIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419 Call Trace: <TASK> ext4_put_super+0x6d4/0xcd0 fs/ext4/super.c:1375 generic_shutdown_super+0x136/0x2d0 fs/super.c:641 kill_block_super+0x44/0x90 fs/super.c:1675 ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327 [...] ============================================ This is because when finding an entry in ext4_xattr_block_cache_find(), if ext4_sb_bread() returns -ENOMEM, the ce's e_refcnt, which has already grown in the __entry_find(), won't be put away, and eventually trigger the above issue in mb_cache_destroy() due to reference count leakage. So call mb_cache_entry_put() on the -ENOMEM error branch as a quick fix.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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，该漏洞源于引用计数泄漏。
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 b878c8a7f08f0c225b6a46ba1ac867e9c5d17807 ~ 9ad75e78747b5a50dc5a52f0f8e92e920a653f16 -
Linux Linux 5.0 -

II. Public POCs for CVE-2024-39276

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III. Intelligence Information for CVE-2024-39276

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Patches & Fixes for CVE-2024-39276 (1)

Other References for CVE-2024-39276 (7)

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-2024-39463 7.8 HIGH 9p: add missing locking around taking dentry fid list
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-2024-39371 io_uring: check for non-NULL file pointer in io_file_can_poll()
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-2021-4440 x86/xen: Drop USERGS_SYSRET64 paravirt call
CVE-2024-39301 net/9p: fix uninit-value in p9_client_rpc()
CVE-2024-39298 mm/memory-failure: fix handling of dissolved but not taken off from buddy pages

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-2024-39276

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