CVE-2024-38385: genirq/irqdesc: Prevent use-after-free in irq_find_at_or_after()
First published: Tue Jun 25 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: genirq/irqdesc: Prevent use-after-free in irq_find_at_or_after() irq_find_at_or_after() dereferences the interrupt descriptor which is returned by mt_find() while neither holding sparse_irq_lock nor RCU read lock, which means the descriptor can be freed between mt_find() and the dereference: CPU0 CPU1 desc = mt_find() delayed_free_desc(desc) irq_desc_get_irq(desc) The use-after-free is reported by KASAN: Call trace: irq_get_next_irq+0x58/0x84 show_stat+0x638/0x824 seq_read_iter+0x158/0x4ec proc_reg_read_iter+0x94/0x12c vfs_read+0x1e0/0x2c8 Freed by task 4471: slab_free_freelist_hook+0x174/0x1e0 __kmem_cache_free+0xa4/0x1dc kfree+0x64/0x128 irq_kobj_release+0x28/0x3c kobject_put+0xcc/0x1e0 delayed_free_desc+0x14/0x2c rcu_do_batch+0x214/0x720 Guard the access with a RCU read lock section.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=6.5<6.6.34 | |
| Linux Linux kernel | >=6.7<6.9.5 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/1c7891812d85500ae2ca4051fa5683fcf29930d8
- https://git.kernel.org/stable/c/b84a8aba806261d2f759ccedf4a2a6a80a5e55ba
- https://git.kernel.org/stable/c/d084aa022f84319f8079e30882cbcbc026af9f21
- https://git.kernel.org/linus/b84a8aba806261d2f759ccedf4a2a6a80a5e55ba
- https://security-tracker.debian.org/tracker/CVE-2024-38385
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-38385
- https://nvd.nist.gov/vuln/detail/CVE-2024-38385
- https://launchpad.net/bugs/cve/CVE-2024-38385
- https://ubuntu.com/security/CVE-2024-38385
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