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CVE-2024-36966— erofs: reliably distinguish block based and fscache mode

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 erofs 中存在安全问题。

AI Predicted 5.5 Difficulty: Easy EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux aca740cecbe57b12bd9c1fc632092af5ebacda0c< f9b877a7ee312ec8ce17598a7ef85cb820d7c371 affected
aca740cecbe57b12bd9c1fc632092af5ebacda0c< dcdd49701e429c55b3644fd70fc58d85745f8cfe affected
aca740cecbe57b12bd9c1fc632092af5ebacda0c< 7af2ae1b1531feab5d38ec9c8f472dc6cceb4606 affected
6.6 affected
< 6.6 unaffected
6.6.32≤ 6.6.* unaffected
6.8.11≤ 6.8.* unaffected
6.9≤ * unaffected
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I. Basic Information for CVE-2024-36966

Vulnerability Information
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Vulnerability Title
erofs: reliably distinguish block based and fscache mode
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: erofs: reliably distinguish block based and fscache mode When erofs_kill_sb() is called in block dev based mode, s_bdev may not have been initialised yet, and if CONFIG_EROFS_FS_ONDEMAND is enabled, it will be mistaken for fscache mode, and then attempt to free an anon_dev that has never been allocated, triggering the following warning: ============================================ ida_free called for id=0 which is not allocated. WARNING: CPU: 14 PID: 926 at lib/idr.c:525 ida_free+0x134/0x140 Modules linked in: CPU: 14 PID: 926 Comm: mount Not tainted 6.9.0-rc3-dirty #630 RIP: 0010:ida_free+0x134/0x140 Call Trace: <TASK> erofs_kill_sb+0x81/0x90 deactivate_locked_super+0x35/0x80 get_tree_bdev+0x136/0x1e0 vfs_get_tree+0x2c/0xf0 do_new_mount+0x190/0x2f0 [...] ============================================ Now when erofs_kill_sb() is called, erofs_sb_info must have been initialised, so use sbi->fsid to distinguish between the two modes.
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 erofs 中存在安全问题。
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 aca740cecbe57b12bd9c1fc632092af5ebacda0c ~ f9b877a7ee312ec8ce17598a7ef85cb820d7c371 -
Linux Linux 6.6 -

II. Public POCs for CVE-2024-36966

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III. Intelligence Information for CVE-2024-36966

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Other References for CVE-2024-36966 (3)

Same Patch Batch · Linux · 2024-06-08 · 6 CVEs total

CVE-2024-36965 7.8 HIGH remoteproc: mediatek: Make sure IPI buffer fits in L2TCM
CVE-2024-36968 7.6 HIGH Bluetooth: L2CAP: Fix div-by-zero in l2cap_le_flowctl_init()
CVE-2024-36967 KEYS: trusted: Fix memory leak in tpm2_key_encode()
CVE-2024-36969 drm/amd/display: Fix division by zero in setup_dsc_config
CVE-2024-36970 wifi: iwlwifi: Use request_module_nowait

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-36966

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