UBUNTU-CVE-2024-26775

Dashboard / Vulnerabilities / UBUNTU-CVE-2024-26775

UBUNTU-CVE-2024-26775

Summary:

Details: In the Linux kernel, the following vulnerability has been resolved: aoe: avoid potential deadlock at set_capacity Move set_capacity() outside of the section procected by (&d->lock). To avoid possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- [1] lock(&bdev->bd_size_lock); local_irq_disable(); [2] lock(&d->lock); [3] lock(&bdev->bd_size_lock); <Interrupt> [4] lock(&d->lock); *** DEADLOCK *** Where [1](&bdev->bd_size_lock) hold by zram_add()->set_capacity(). [2]lock(&d->lock) hold by aoeblk_gdalloc(). And aoeblk_gdalloc() is trying to acquire [3](&bdev->bd_size_lock) at set_capacity() call. In this situation an attempt to acquire [4]lock(&d->lock) from aoecmd_cfg_rsp() will lead to deadlock. So the simplest solution is breaking lock dependency [2](&d->lock) -> [3](&bdev->bd_size_lock) by moving set_capacity() outside.

References: https://ubuntu.com/security/CVE-2024-26775, https://git.kernel.org/linus/e169bd4fb2b36c4b2bee63c35c740c85daeb2e86, https://git.kernel.org/stable/c/2d623c94fbba3554f4446ba6f3c764994e8b0d26, https://git.kernel.org/stable/c/673629018ba04906899dcb631beec34d871f709c, https://git.kernel.org/stable/c/19a77b27163820f793b4d022979ffdca8f659b77, https://git.kernel.org/stable/c/e169bd4fb2b36c4b2bee63c35c740c85daeb2e86, https://www.cve.org/CVERecord?id=CVE-2024-26775, https://ubuntu.com/security/notices/USN-7774-1, https://ubuntu.com/security/notices/USN-7774-2, https://ubuntu.com/security/notices/USN-7774-3, https://ubuntu.com/security/notices/USN-7775-1, https://ubuntu.com/security/notices/USN-7776-1, https://ubuntu.com/security/notices/USN-7775-2, https://ubuntu.com/security/notices/USN-7775-3, https://ubuntu.com/security/notices/USN-7774-4, https://ubuntu.com/security/notices/USN-7774-5