high CVSS 7.8

CVE-2022-48792·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: scsi: pm8001: Fix use-after-free for aborted SSP/STP sas_task Currently a use-after-free may occur if a sas_task is aborted by the upper layer before we handle the I/O completion in mpi_ssp_completion() or mpi_sata_completion(). In this case, the following are the two steps in handling those I/O completions: - Call complete() to inform the upper layer handler of completion of the I/O. - Release driver resources associated with the sas_task in pm8001_ccb_task_free() call. When complete() is called, the upper layer may free the sas_task. As such, we should not touch the associated sas_task afterwards, but we do so in the pm8001_ccb_task_free() call. Fix by swapping the complete() and pm8001_ccb_task_free() calls ordering.

Severity
high
Software
Kernel
Fixed in
5.16.11
Published
2024-07-16

Affected versions

From: 5.16

Until: 5.16.11

Fixed in: 5.16.11

How to fix this CVE

Update your Linux kernel to version 5.16.11 or later to address a use-after-free vulnerability in the PM8001 SCSI driver that could allow local privilege escalation through improper handling of aborted SAS tasks. The vulnerability occurs when task completion handlers access freed memory after the upper layer has already released resources. Apply the latest stable kernel patch immediately to prevent potential system compromise.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Step 1: Check kernel version by running `uname -r` and verify it is 5.16.11 or newer (or use `cat /proc/version`)
  2. Step 2: Confirm PM8001 driver is in use with `lsmod | grep pm8001` or check `lspci | grep -i sas` for compatible hardware
  3. Step 3: Search kernel logs for use-after-free errors with `dmesg | grep -i 'use-after-free\|pm8001\|sas_task' | tail -20`
  4. Step 4: After patching, reboot and run `uname -r` again to verify the new kernel version has loaded, then re-check dmesg for absence of related errors

FAQ

What is CVE-2022-48792?

CVE-2022-48792 is a use-after-free vulnerability in the Linux kernel's PM8001 SAS controller driver that occurs when the driver accesses freed memory from an aborted task after the upper layer has already released it, potentially leading to local privilege escalation.

Is CVE-2022-48792 being actively exploited?

No, CVE-2022-48792 is not listed in CISA's Known Exploited Vulnerabilities (KEV) catalog and has no publicly available exploit code.

What versions of Kernel are affected by CVE-2022-48792?

Linux kernel versions 5.16 through 5.16.10 are vulnerable. Version 5.16.11 and all subsequent stable releases have the fix applied.

How do I check if my server is vulnerable to CVE-2022-48792?

Run `uname -r` to check your kernel version; if it is between 5.16.0 and 5.16.10, you are vulnerable. Additionally, confirm PM8001 driver presence with `lsmod | grep pm8001` to determine if the vulnerable code path is active.

Does Defensia detect CVE-2022-48792?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If the Linux kernel is installed on a monitored server running version 5.16.0–5.16.10, CVE-2022-48792 will appear in your dashboard with remediation steps.

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CVE-2026-64066CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: netfs: Fix netfs_read_to_pagecache() to pause on subreq failure Fix netfs_read_to_pagecache() so that it pauses the generation of new subrequests if an already-issued subrequest fails.
CVE-2026-64383CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_flush() replay SMB2_flush() keeps its response buffer bookkeeping across replay attempts. If a replayable flush response is received and the retry then fails before cifs_send_recv() stores a replacement response, flush_exit will free the stale response pointer a second time. Reinitialize resp_buftype and rsp_iov at the top of the replay loop so cleanup only acts on response state produced by the current attempt. This fixes a double-free without changing replay handling for successful requests.
CVE-2026-64067CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: netfs: Fix missing barriers when accessing stream->subrequests locklessly The list of subrequests attached to stream->subrequests is accessed without locks by netfs_collect_read_results() and netfs_collect_write_results(), and then they access subreq->flags without taking a barrier after getting the subreq pointer from the list. Relatedly, the functions that build the list don't use any sort of write barrier when constructing the list to make sure that the NETFS_SREQ_IN_PROGRESS flag is perceived to be set first if no lock is taken. Fix this by: (1) Add a new list_add_tail_release() function that uses a release barrier to set the pointer to the new member of the list. (2) Add a new list_first_entry_or_null_acquire() function that uses an acquire barrier to read the pointer to the first member in a list (or return NULL). (3) Use list_add_tail_release() when adding a subreq to ->subrequests. (4) Use list_first_entry_or_null_acquire() when initially accessing the front of the list (when an item is removed, the pointer to the new front iterm is obtained under the same lock).

References

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