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CVE-2024-36962— net: ks8851: Queue RX packets in IRQ handler instead of disabling BHs

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 net ks8851 中存在安全问题。

CVSS 7.5 · High EPSS 0.46% · P39

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 7

VendorProduct Version RangeStatus
Linux Linux 492337a4fbd1421b42df684ee9b34be2a2722540< 8a3ff43dcbab7c96f9e8cf2bd1049ab8d6e59545 affected
cba376eb036c2c20077b41d47b317d8218fe754f< ae87f661f3c1a3134a7ed86ab69bf9f12af88993 affected
49d5d70538b6b8f2a3f8f1ac30c1f921d4a0929b< 7e2901a2a9195da76111f351584bf77552a038f0 affected
be0384bf599cf1eb8d337517feeb732d71f75a6f< e0863634bf9f7cf36291ebb5bfa2d16632f79c49 affected
6.1.87< 6.1.91 affected
6.6.28< 6.6.31 affected
6.8.7< 6.8.10 affected
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I. Basic Information for CVE-2024-36962

Vulnerability Information
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Vulnerability Title
net: ks8851: Queue RX packets in IRQ handler instead of disabling BHs
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: ks8851: Queue RX packets in IRQ handler instead of disabling BHs Currently the driver uses local_bh_disable()/local_bh_enable() in its IRQ handler to avoid triggering net_rx_action() softirq on exit from netif_rx(). The net_rx_action() could trigger this driver .start_xmit callback, which is protected by the same lock as the IRQ handler, so calling the .start_xmit from netif_rx() from the IRQ handler critical section protected by the lock could lead to an attempt to claim the already claimed lock, and a hang. The local_bh_disable()/local_bh_enable() approach works only in case the IRQ handler is protected by a spinlock, but does not work if the IRQ handler is protected by mutex, i.e. this works for KS8851 with Parallel bus interface, but not for KS8851 with SPI bus interface. Remove the BH manipulation and instead of calling netif_rx() inside the IRQ handler code protected by the lock, queue all the received SKBs in the IRQ handler into a queue first, and once the IRQ handler exits the critical section protected by the lock, dequeue all the queued SKBs and push them all into netif_rx(). At this point, it is safe to trigger the net_rx_action() softirq, since the netif_rx() call is outside of the lock that protects the IRQ handler.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 net ks8851 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 492337a4fbd1421b42df684ee9b34be2a2722540 ~ 8a3ff43dcbab7c96f9e8cf2bd1049ab8d6e59545 -
Linux Linux 6.1.87 ~ 6.1.91 -

II. Public POCs for CVE-2024-36962

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III. Intelligence Information for CVE-2024-36962

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Other References for CVE-2024-36962 (3)

Same Patch Batch · Linux · 2024-06-03 · 5 CVEs total

CVE-2024-36964 8.8 HIGH fs/9p: only translate RWX permissions for plain 9P2000
CVE-2024-36961 7.8 HIGH thermal/debugfs: Fix two locking issues with thermal zone debug
CVE-2024-36963 7.8 HIGH tracefs: Reset permissions on remount if permissions are options
CVE-2024-36960 7.1 HIGH drm/vmwgfx: Fix invalid reads in fence signaled events

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-36962

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