high CVSS 7.8

CVE-2023-52475·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: Input: powermate - fix use-after-free in powermate_config_complete syzbot has found a use-after-free bug [1] in the powermate driver. This happens when the device is disconnected, which leads to a memory free from the powermate_device struct. When an asynchronous control message completes after the kfree and its callback is invoked, the lock does not exist anymore and hence the bug. Use usb_kill_urb() on pm->config to cancel any in-progress requests upon device disconnection. [1] https://syzkaller.appspot.com/bug?extid=0434ac83f907a1dbdd1e

Severity
high
Software
Kernel
Fixed in
6.5.8
Published
2024-02-29

Affected versions

From: 6.2

Until: 6.5.8

Fixed in: 6.5.8

How to fix this CVE

Update your Linux kernel to version 6.5.8 or later to resolve a use-after-free vulnerability in the powermate USB driver. This flaw occurs when a device is disconnected while an asynchronous control message is still pending, causing the kernel to access freed memory when the callback executes. Apply this patch promptly to prevent potential kernel crashes or privilege escalation from local attackers with device access.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Check your current kernel version by running: uname -r
  2. Verify if the powermate driver is loaded: lsmod | grep powermate
  3. Compare your kernel version against 6.5.8 — if less than 6.5.8 and between 6.2–6.5.7, you are vulnerable
  4. After applying the kernel update, reboot and confirm with uname -r that the new version is active

FAQ

What is CVE-2023-52475?

A use-after-free vulnerability in the Linux kernel's powermate USB driver that occurs when a device disconnects while an asynchronous control request is in-flight, allowing the callback to reference freed memory and potentially crash the kernel.

Is CVE-2023-52475 being actively exploited?

No, this vulnerability is not currently listed in CISA's Known Exploited Vulnerabilities catalog and no public exploits are available.

What versions of Kernel are affected by CVE-2023-52475?

Linux kernel versions 6.2 through 6.5.7 are vulnerable; version 6.5.8 and later include the fix.

How do I check if my server is vulnerable to CVE-2023-52475?

Run `uname -r` to obtain your kernel version. If the version is between 6.2 and 6.5.7 and you use powermate devices, your system is vulnerable.

Does Defensia detect CVE-2023-52475?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If the Linux kernel is installed on a monitored server, CVE-2023-52475 will appear in your dashboard with remediation steps.

Related Kernel CVEs

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CVE-2024-36031CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: keys: Fix overwrite of key expiration on instantiation The expiry time of a key is unconditionally overwritten during instantiation, defaulting to turn it permanent. This causes a problem for DNS resolution as the expiration set by user-space is overwritten to TIME64_MAX, disabling further DNS updates. Fix this by restoring the condition that key_set_expiry is only called when the pre-parser sets a specific expiry.
CVE-2024-38612CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: ipv6: sr: fix invalid unregister error path The error path of seg6_init() is wrong in case CONFIG_IPV6_SEG6_LWTUNNEL is not defined. In that case if seg6_hmac_init() fails, the genl_unregister_family() isn't called. This issue exist since commit 46738b1317e1 ("ipv6: sr: add option to control lwtunnel support"), and commit 5559cea2d5aa ("ipv6: sr: fix possible use-after-free and null-ptr-deref") replaced unregister_pernet_subsys() with genl_unregister_family() in this error path.
CVE-2024-38623CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: Use variable length array instead of fixed size Should fix smatch warning: ntfs_set_label() error: __builtin_memcpy() 'uni->name' too small (20 vs 256)
CVE-2021-47548CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: ethernet: hisilicon: hns: hns_dsaf_misc: fix a possible array overflow in hns_dsaf_ge_srst_by_port() The if statement: if (port >= DSAF_GE_NUM) return; limits the value of port less than DSAF_GE_NUM (i.e., 8). However, if the value of port is 6 or 7, an array overflow could occur: port_rst_off = dsaf_dev->mac_cb[port]->port_rst_off; because the length of dsaf_dev->mac_cb is DSAF_MAX_PORT_NUM (i.e., 6). To fix this possible array overflow, we first check port and if it is greater than or equal to DSAF_MAX_PORT_NUM, the function returns.

References

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