In the Linux kernel, the following vulnerability has been resolved:
ublk_drv: fix NULL pointer dereference in ublk_ctrl_start_recovery()
When two UBLK_CMD_START_USER_RECOVERY commands are submitted, the
first one sets ‘ubq->ubq_daemon’ to NULL, and the second one triggers
WARN in ublk_queue_reinit() and subsequently a NULL pointer dereference
issue.
Fix it by adding the check in ublk_ctrl_start_recovery() and return
immediately in case of zero ‘ub->nr_queues_ready’.
BUG: kernel NULL pointer dereference, address: 0000000000000028
RIP: 0010:ublk_ctrl_start_recovery.constprop.0+0x82/0x180
Call Trace:
<TASK>
? __die+0x20/0x70
? page_fault_oops+0x75/0x170
? exc_page_fault+0x64/0x140
? asm_exc_page_fault+0x22/0x30
? ublk_ctrl_start_recovery.constprop.0+0x82/0x180
ublk_ctrl_uring_cmd+0x4f7/0x6c0
? pick_next_task_idle+0x26/0x40
io_uring_cmd+0x9a/0x1b0
io_issue_sqe+0x193/0x3f0
io_wq_submit_work+0x9b/0x390
io_worker_handle_work+0x165/0x360
io_wq_worker+0xcb/0x2f0
? finish_task_switch.isra.0+0x203/0x290
? finish_task_switch.isra.0+0x203/0x290
? __pfx_io_wq_worker+0x10/0x10
ret_from_fork+0x2d/0x50
? __pfx_io_wq_worker+0x10/0x10
ret_from_fork_asm+0x1a/0x30
</TASK>
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/block/ublk_drv.c"
],
"versions": [
{
"version": "c732a852b419",
"lessThan": "ca249435893d",
"status": "affected",
"versionType": "git"
},
{
"version": "c732a852b419",
"lessThan": "136a29d8112d",
"status": "affected",
"versionType": "git"
},
{
"version": "c732a852b419",
"lessThan": "7c890ef60bf4",
"status": "affected",
"versionType": "git"
},
{
"version": "c732a852b419",
"lessThan": "e58f5142f883",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/block/ublk_drv.c"
],
"versions": [
{
"version": "6.1",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.1",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.110",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6.51",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.10.10",
"lessThanOrEqual": "6.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.11",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]