{"id":"DEBIAN-CVE-2022-50381","details":"In the Linux kernel, the following vulnerability has been resolved:  md: fix a crash in mempool_free  There's a crash in mempool_free when running the lvm test shell/lvchange-rebuild-raid.sh.  The reason for the crash is this: * super_written calls atomic_dec_and_test(&mddev-\u003epending_writes) and   wake_up(&mddev-\u003esb_wait). Then it calls rdev_dec_pending(rdev, mddev)   and bio_put(bio). * so, the process that waited on sb_wait and that is woken up is racing   with bio_put(bio). * if the process wins the race, it calls bioset_exit before bio_put(bio)   is executed. * bio_put(bio) attempts to free a bio into a destroyed bio set - causing   a crash in mempool_free.  We fix this bug by moving bio_put before atomic_dec_and_test.  We also move rdev_dec_pending before atomic_dec_and_test as suggested by Neil Brown.  The function md_end_flush has a similar bug - we must call bio_put before we decrement the number of in-progress bios.   BUG: kernel NULL pointer dereference, address: 0000000000000000  #PF: supervisor write access in kernel mode  #PF: error_code(0x0002) - not-present page  PGD 11557f0067 P4D 11557f0067 PUD 0  Oops: 0002 [#1] PREEMPT SMP  CPU: 0 PID: 73 Comm: kworker/0:1 Not tainted 6.1.0-rc3 #5  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014  Workqueue: kdelayd flush_expired_bios [dm_delay]  RIP: 0010:mempool_free+0x47/0x80  Code: 48 89 ef 5b 5d ff e0 f3 c3 48 89 f7 e8 32 45 3f 00 48 63 53 08 48 89 c6 3b 53 04 7d 2d 48 8b 43 10 8d 4a 01 48 89 df 89 4b 08 \u003c48\u003e 89 2c d0 e8 b0 45 3f 00 48 8d 7b 30 5b 5d 31 c9 ba 01 00 00 00  RSP: 0018:ffff88910036bda8 EFLAGS: 00010093  RAX: 0000000000000000 RBX: ffff8891037b65d8 RCX: 0000000000000001  RDX: 0000000000000000 RSI: 0000000000000202 RDI: ffff8891037b65d8  RBP: ffff8891447ba240 R08: 0000000000012908 R09: 00000000003d0900  R10: 0000000000000000 R11: 0000000000173544 R12: ffff889101a14000  R13: ffff8891562ac300 R14: ffff889102b41440 R15: ffffe8ffffa00d05  FS:  0000000000000000(0000) GS:ffff88942fa00000(0000) knlGS:0000000000000000  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033  CR2: 0000000000000000 CR3: 0000001102e99000 CR4: 00000000000006b0  Call Trace:   \u003cTASK\u003e   clone_endio+0xf4/0x1c0 [dm_mod]   clone_endio+0xf4/0x1c0 [dm_mod]   __submit_bio+0x76/0x120   submit_bio_noacct_nocheck+0xb6/0x2a0   flush_expired_bios+0x28/0x2f [dm_delay]   process_one_work+0x1b4/0x300   worker_thread+0x45/0x3e0   ? rescuer_thread+0x380/0x380   kthread+0xc2/0x100   ? kthread_complete_and_exit+0x20/0x20   ret_from_fork+0x1f/0x30   \u003c/TASK\u003e  Modules linked in: brd dm_delay dm_raid dm_mod af_packet uvesafb cfbfillrect cfbimgblt cn cfbcopyarea fb font fbdev tun autofs4 binfmt_misc configfs ipv6 virtio_rng virtio_balloon rng_core virtio_net pcspkr net_failover failover qemu_fw_cfg button mousedev raid10 raid456 libcrc32c async_raid6_recov async_memcpy async_pq raid6_pq async_xor xor async_tx raid1 raid0 md_mod sd_mod t10_pi crc64_rocksoft crc64 virtio_scsi scsi_mod evdev psmouse bsg scsi_common [last unloaded: brd]  CR2: 0000000000000000  ---[ end trace 0000000000000000 ]---","modified":"2026-09-01T16:05:35.038134174Z","published":"2025-09-18T14:15:36.873Z","upstream":["CVE-2022-50381"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-50381"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50381.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50381.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.4-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-50381.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"}]}