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CVE-2024-43863— drm/vmwgfx: Fix a deadlock in dma buf fence polling

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。攻击者利用该漏洞会导致死锁问题。

AI Predicted 4.3 Difficulty: Moderate EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 2298e804e96eb3635c39519c8287befd92460303< 9908dc0d2ef0e4aec8a242c098455729c0e2f017 affected
2298e804e96eb3635c39519c8287befd92460303< 9e20d028d8d1deb1e7fed18f22ffc01669cf3237 affected
2298e804e96eb3635c39519c8287befd92460303< 3b933b16c996af8adb6bc1b5748a63dfb41a82bc affected
2298e804e96eb3635c39519c8287befd92460303< a8943969f9ead2fd3044fc826140a21622ef830e affected
2298e804e96eb3635c39519c8287befd92460303< c98ab18b9f315ff977c2c65d7c71298ef98be8e3 affected
2298e804e96eb3635c39519c8287befd92460303< e58337100721f3cc0c7424a18730e4f39844934f affected
3.18 affected
< 3.18 unaffected
… +6 more rows
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I. Basic Information for CVE-2024-43863

Vulnerability Information
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Vulnerability Title
drm/vmwgfx: Fix a deadlock in dma buf fence polling
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: Fix a deadlock in dma buf fence polling Introduce a version of the fence ops that on release doesn't remove the fence from the pending list, and thus doesn't require a lock to fix poll->fence wait->fence unref deadlocks. vmwgfx overwrites the wait callback to iterate over the list of all fences and update their status, to do that it holds a lock to prevent the list modifcations from other threads. The fence destroy callback both deletes the fence and removes it from the list of pending fences, for which it holds a lock. dma buf polling cb unrefs a fence after it's been signaled: so the poll calls the wait, which signals the fences, which are being destroyed. The destruction tries to acquire the lock on the pending fences list which it can never get because it's held by the wait from which it was called. Old bug, but not a lot of userspace apps were using dma-buf polling interfaces. Fix those, in particular this fixes KDE stalls/deadlock.
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。攻击者利用该漏洞会导致死锁问题。
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 2298e804e96eb3635c39519c8287befd92460303 ~ 9908dc0d2ef0e4aec8a242c098455729c0e2f017 -
Linux Linux 3.18 -

II. Public POCs for CVE-2024-43863

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III. Intelligence Information for CVE-2024-43863

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Other References for CVE-2024-43863 (5)

Same Patch Batch · Linux · 2024-08-20 · 8 CVEs total

CVE-2024-43864 9.8 CRITICAL net/mlx5e: Fix CT entry update leaks of modify header context
CVE-2024-43861 net: usb: qmi_wwan: fix memory leak for not ip packets
CVE-2024-43862 net: wan: fsl_qmc_hdlc: Convert carrier_lock spinlock to a mutex
CVE-2024-43865 s390/fpu: Re-add exception handling in load_fpu_state()
CVE-2024-43866 net/mlx5: Always drain health in shutdown callback
CVE-2024-43867 drm/nouveau: prime: fix refcount underflow
CVE-2024-43868 riscv/purgatory: align riscv_kernel_entry

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-43863

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