CVE-2024-42300

published 2024-08-17

CVE-2024-42300: In the Linux kernel, the following vulnerability has been resolved: erofs: fix race in z_erofs_get_gbuf() In z_erofs_get_gbuf(), the current task may be…

Priority P4 16 medium 4.7 CVSS 3.1

AV L AC H PR L UI N S U C N I N A H

In the Linux kernel, the following vulnerability has been resolved:

erofs: fix race in z_erofs_get_gbuf()

In z_erofs_get_gbuf(), the current task may be migrated to another
CPU between `z_erofs_gbuf_id()` and `spin_lock(&gbuf->lock)`.

Therefore, z_erofs_put_gbuf() will trigger the following issue
which was found by stress test:

[772156.434168] kernel BUG at fs/erofs/zutil.c:58!
..
[772156.435007]
[772156.439237] CPU: 0 PID: 3078 Comm: stress Kdump: loaded Tainted: G E 6.10.0-rc7+ #2
[772156.439239] Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 1.0.0 01/01/2017
[772156.439241] pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
[772156.439243] pc : z_erofs_put_gbuf+0x64/0x70 [erofs]
[772156.439252] lr : z_erofs_lz4_decompress+0x600/0x6a0 [erofs]
..
[772156.445958] stress (3127): drop_caches: 1
[772156.446120] Call trace:
[772156.446121] z_erofs_put_gbuf+0x64/0x70 [erofs]
[772156.446761] z_erofs_lz4_decompress+0x600/0x6a0 [erofs]
[772156.446897] z_erofs_decompress_queue+0x740/0xa10 [erofs]
[772156.447036] z_erofs_runqueue+0x428/0x8c0 [erofs]
[772156.447160] z_erofs_readahead+0x224/0x390 [erofs]
..

Affected

7 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.10.3-1 (forky)	linux 6.10.3-1 (forky)
linux	linux	—	—
linux	linux	>= f36f3010f67611a45d66e773bc91e4c66a9abab5 < 49b22e06a947727a6d1c802d2d9ad92420b90fc5	49b22e06a947727a6d1c802d2d9ad92420b90fc5
linux	linux	>= f36f3010f67611a45d66e773bc91e4c66a9abab5 < 7dc5537c3f8be87e005f0844a7626c987914f8fd	7dc5537c3f8be87e005f0844a7626c987914f8fd
linux	linux_kernel	>= 0 < 6.10.3-1	6.10.3-1
linux	linux_kernel	>= 0 < 6.10.3-1	6.10.3-1
linux	linux_kernel	>= 6.10 < 6.10.3	6.10.3

CVSS provenance

nvd v3.1 4.7 MEDIUM CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 4.7 MEDIUM

vendor_debian 4.7 LOW

vendor_redhat 4.7 MEDIUM

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