{"id":"DEBIAN-CVE-2024-36478","details":"In the Linux kernel, the following vulnerability has been resolved:  null_blk: fix null-ptr-dereference while configuring 'power' and 'submit_queues'  Writing 'power' and 'submit_queues' concurrently will trigger kernel panic:  Test script:  modprobe null_blk nr_devices=0 mkdir -p /sys/kernel/config/nullb/nullb0 while true; do echo 1 \u003e submit_queues; echo 4 \u003e submit_queues; done & while true; do echo 1 \u003e power; echo 0 \u003e power; done  Test result:  BUG: kernel NULL pointer dereference, address: 0000000000000148 Oops: 0000 [#1] PREEMPT SMP RIP: 0010:__lock_acquire+0x41d/0x28f0 Call Trace:  \u003cTASK\u003e  lock_acquire+0x121/0x450  down_write+0x5f/0x1d0  simple_recursive_removal+0x12f/0x5c0  blk_mq_debugfs_unregister_hctxs+0x7c/0x100  blk_mq_update_nr_hw_queues+0x4a3/0x720  nullb_update_nr_hw_queues+0x71/0xf0 [null_blk]  nullb_device_submit_queues_store+0x79/0xf0 [null_blk]  configfs_write_iter+0x119/0x1e0  vfs_write+0x326/0x730  ksys_write+0x74/0x150  This is because del_gendisk() can concurrent with blk_mq_update_nr_hw_queues():  nullb_device_power_store\tnullb_apply_submit_queues  null_del_dev  del_gendisk \t\t\t\t nullb_update_nr_hw_queues \t\t\t\t  if (!dev-\u003enullb) \t\t\t\t  // still set while gendisk is deleted \t\t\t\t   return 0 \t\t\t\t  blk_mq_update_nr_hw_queues  dev-\u003enullb = NULL  Fix this problem by resuing the global mutex to protect nullb_device_power_store() and nullb_update_nr_hw_queues() from configfs.","modified":"2026-09-15T09:03:07.583401222Z","published":"2024-06-21T11:15:10.360Z","upstream":["CVE-2024-36478"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-36478"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.119-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-36478.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.9.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-36478.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.9.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-36478.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}