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CVE-2026-93815

net: au1000: move free_irq out of the close-time spinlocked section

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, and 1 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: net: au1000: move free_irq out of the close-time spinlocked section au1000_close() calls free_irq() while aup->lock is still held with spin_lock_irqsave(). free_irq() can sleep because it takes the IRQ descriptor request mutex, so it does not belong inside the close-time spinlocked section. This was found by our static analysis tool and then confirmed by manual review of the in-tree au1000_close() .ndo_stop path. The reviewed path keeps aup->lock held across the MAC reset, queue stop and free_irq(dev->irq, dev). A directed runtime validation kept that ndo_stop carrier and the same free_irq(dev->irq, dev) operation under the driver lock. Lockdep reported "BUG: sleeping function called from invalid context" and "Invalid wait context" while free_irq() was taking desc->request_mutex, with au1000_close() and free_irq() on the stack. Drop aup->lock before freeing the IRQ. The protected close-time work still stops the device and queue before IRQ teardown, but the sleepable IRQ core path now runs outside the spinlocked section.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in f86bca5b7857b85bfa8afdb4fa895d7c0a3f7ebc; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 26fd652915123a690f19d62b253b545a53f3cd51; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in d514b08ed61fdffe23604fd3e9e53c07cbe5ac3e; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in e1b5a13249975fec3cf654efa84f57118db2da2c; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 4536667fba8ddbaff2f2a135080ae6aabf737b5e; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in fc2233f1ab2a1ca562869bca6987d7477671388c; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in f48763beab4eea41fc480c9702ec6eebe8d75e4f

  • Linux Linux

    2.6.12

  • KernelLinux

    From 2.6.12 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.53

References 7

git.kernel.org