CVE-2024-38780: dma-buf/sw-sync: don't enable IRQ from sync_print_obj()

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-06-21 · updated 2026-10-15
Weakness: CWE-667

Description

In the Linux kernel, the following vulnerability has been resolved: dma-buf/sw-sync: don't enable IRQ from sync_print_obj() Since commit a6aa8fca4d79 ("dma-buf/sw-sync: Reduce irqsave/irqrestore from known context") by error replaced spin_unlock_irqrestore() with spin_unlock_irq() for both sync_debugfs_show() and sync_print_obj() despite sync_print_obj() is called from sync_debugfs_show(), lockdep complains inconsistent lock state warning. Use plain spin_{lock,unlock}() for sync_print_obj(), for sync_debugfs_show() is already using spin_{lock,unlock}_irq().

Affected products

Linux kernel: before 4.14; from 4.19 before 4.19.316; from 5.4 before 5.4.278; from 5.10 before 5.10.219; from 5.15 before 5.15.161; from 6.1 before 6.1.93 — fixed in 4.14, 4.19.316, 5.10.219, 5.15.161, 5.4.278, 6.1.93

How to fix

Upgrade to a fixed version: Linux kernel 4.14, 4.19.316, 5.10.219, 5.15.161. Check the vendor advisory for mitigations.

References

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