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CVE-2023-52468— class: fix use-after-free in class_register()

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class_register（）存在释放后重用漏洞。

AI Predicted 6.8 Difficulty: Moderate EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux dcfbb67e48a2becfce7990386e985b9c45098ee5< b57196a5ec5e4c0ffecde8348b085b778c7dce04 affected
dcfbb67e48a2becfce7990386e985b9c45098ee5< 0f1486dafca3398c4c46b9f6e6452fa27e73b559 affected
dcfbb67e48a2becfce7990386e985b9c45098ee5< 93ec4a3b76404bce01bd5c9032bef5df6feb1d62 affected
6.4 affected
< 6.4 unaffected
6.6.14≤ 6.6.* unaffected
6.7.2≤ 6.7.* unaffected
6.8≤ * unaffected
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I. Basic Information for CVE-2023-52468

Vulnerability Information
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Vulnerability Title
class: fix use-after-free in class_register()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: class: fix use-after-free in class_register() The lock_class_key is still registered and can be found in lock_keys_hash hlist after subsys_private is freed in error handler path.A task who iterate over the lock_keys_hash later may cause use-after-free.So fix that up and unregister the lock_class_key before kfree(cp). On our platform, a driver fails to kset_register because of creating duplicate filename '/class/xxx'.With Kasan enabled, it prints a invalid-access bug report. KASAN bug report: BUG: KASAN: invalid-access in lockdep_register_key+0x19c/0x1bc Write of size 8 at addr 15ffff808b8c0368 by task modprobe/252 Pointer tag: [15], memory tag: [fe] CPU: 7 PID: 252 Comm: modprobe Tainted: G W 6.6.0-mainline-maybe-dirty #1 Call trace: dump_backtrace+0x1b0/0x1e4 show_stack+0x2c/0x40 dump_stack_lvl+0xac/0xe0 print_report+0x18c/0x4d8 kasan_report+0xe8/0x148 __hwasan_store8_noabort+0x88/0x98 lockdep_register_key+0x19c/0x1bc class_register+0x94/0x1ec init_module+0xbc/0xf48 [rfkill] do_one_initcall+0x17c/0x72c do_init_module+0x19c/0x3f8 ... Memory state around the buggy address: ffffff808b8c0100: 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a 8a ffffff808b8c0200: 8a 8a 8a 8a 8a 8a 8a 8a fe fe fe fe fe fe fe fe >ffffff808b8c0300: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ^ ffffff808b8c0400: 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 03 As CONFIG_KASAN_GENERIC is not set, Kasan reports invalid-access not use-after-free here.In this case, modprobe is manipulating the corrupted lock_keys_hash hlish where lock_class_key is already freed before. It's worth noting that this only can happen if lockdep is enabled, which is not true for normal system.
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class_register（）存在释放后重用漏洞。
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 dcfbb67e48a2becfce7990386e985b9c45098ee5 ~ b57196a5ec5e4c0ffecde8348b085b778c7dce04 -
Linux Linux 6.4 -

II. Public POCs for CVE-2023-52468

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III. Intelligence Information for CVE-2023-52468

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Other References for CVE-2023-52468 (2)

Same Patch Batch · Linux · 2024-02-25 · 11 CVEs total

CVE-2023-52469 7.8 HIGH drivers/amd/pm: fix a use-after-free in kv_parse_power_table
CVE-2023-52465 power: supply: Fix null pointer dereference in smb2_probe
CVE-2023-52467 mfd: syscon: Fix null pointer dereference in of_syscon_register()
CVE-2023-52470 drm/radeon: check the alloc_workqueue return value in radeon_crtc_init()
CVE-2023-52471 ice: Fix some null pointer dereference issues in ice_ptp.c
CVE-2023-52472 crypto: rsa - add a check for allocation failure
CVE-2023-52473 thermal: core: Fix NULL pointer dereference in zone registration error path
CVE-2021-46904 net: hso: fix null-ptr-deref during tty device unregistration
CVE-2021-46905 net: hso: fix NULL-deref on disconnect regression
CVE-2022-48626 moxart: fix potential use-after-free on remove path

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-52468

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