CVE-2022-48858
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix a race on command flush flow Fix a refcount use after free warning due to a race on command entry.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.18%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix a race on command flush flow Fix a refcount use after free warning due to a race on command entry. Such race occurs when one of the commands releases its last refcount and frees its index and entry while another process running command flush flow takes refcount to this command entry. The process which handles commands flush may see this command as needed to be flushed if the other process released its refcount but didn't release the index yet. Fix it by adding the needed spin lock. It fixes the following warning trace: refcount_t: addition on 0; use-after-free. WARNING: CPU: 11 PID: 540311 at lib/refcount.c:25 refcount_warn_saturate+0x80/0xe0 ... RIP: 0010:refcount_warn_saturate+0x80/0xe0 ... Call Trace: <TASK> mlx5_cmd_trigger_completions+0x293/0x340 [mlx5_core] mlx5_cmd_flush+0x3a/0xf0 [mlx5_core] enter_error_state+0x44/0x80 [mlx5_core] mlx5_fw_fatal_reporter_err_work+0x37/0xe0 [mlx5_core] process_one_work+0x1be/0x390 worker_thread+0x4d/0x3d0 ? rescuer_thread+0x350/0x350 kthread+0x141/0x160 ? set_kthread_struct+0x40/0x40 ret_from_fork+0x1f/0x30 </TASK>
- CVSS 3.1
- 7.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.18% probability · 8th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362, CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0401bfb27a91d7bdd74b1635c1aae57cbb128da6Patch
- https://git.kernel.org/stable/c/063bd355595428750803d8736a9bb7c8db67d42dPatch
- https://git.kernel.org/stable/c/1a4017926eeea56c7540cc41b42106746ee8a0eePatch
- https://git.kernel.org/stable/c/7c519f769f555ff7d9d4ccba3497bbb589df360aPatch
- https://git.kernel.org/stable/c/f3331bc17449f15832c31823f27573f4c0e13e5fPatch
- https://git.kernel.org/stable/c/0401bfb27a91d7bdd74b1635c1aae57cbb128da6Patch
- https://git.kernel.org/stable/c/063bd355595428750803d8736a9bb7c8db67d42dPatch
- https://git.kernel.org/stable/c/1a4017926eeea56c7540cc41b42106746ee8a0eePatch
- https://git.kernel.org/stable/c/7c519f769f555ff7d9d4ccba3497bbb589df360aPatch
- https://git.kernel.org/stable/c/f3331bc17449f15832c31823f27573f4c0e13e5fPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.