high CVSS 7.8

CVE-2022-49524·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: media: pci: cx23885: Fix the error handling in cx23885_initdev() When the driver fails to call the dma_set_mask(), the driver will get the following splat: [ 55.853884] BUG: KASAN: use-after-free in __process_removed_driver+0x3c/0x240 [ 55.854486] Read of size 8 at addr ffff88810de60408 by task modprobe/590 [ 55.856822] Call Trace: [ 55.860327] __process_removed_driver+0x3c/0x240 [ 55.861347] bus_for_each_dev+0x102/0x160 [ 55.861681] i2c_del_driver+0x2f/0x50 This is because the driver has initialized the i2c related resources in cx23885_dev_setup() but not released them in error handling, fix this bug by modifying the error path that jumps after failing to call the dma_set_mask().

Severity
high
Software
Kernel
Fixed in
5.18.3
Published
2025-02-26

Affected versions

From: 5.18

Until: 5.18.3

Fixed in: 5.18.3

How to fix this CVE

Update your Linux kernel to version 5.18.3 or later to address a use-after-free vulnerability in the cx23885 media driver that occurs when DMA mask initialization fails. This flaw can lead to memory corruption and system instability if the affected driver error path is triggered. Apply the kernel update and reboot your system to complete remediation.

sudo dnf upgrade kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Check your kernel version with: uname -r (vulnerable if output shows 5.18.0, 5.18.1, or 5.18.2)
  2. Verify the cx23885 driver is loaded with: lsmod | grep cx23885 (if no output, this driver is not in use)
  3. Search system logs for DMA initialization errors with: sudo grep -i 'dma_set_mask' /var/log/kern.log /var/log/messages 2>/dev/null
  4. Confirm the fix is applied by verifying kernel version is 5.18.3 or later with: uname -r (should show 5.18.3+)

FAQ

What is CVE-2022-49524?

This is a use-after-free vulnerability in the Linux cx23885 media driver where improper error handling during device initialization fails to release I2C resources when DMA mask configuration fails, potentially allowing local privilege escalation or system crash.

Is CVE-2022-49524 being actively exploited?

No, this vulnerability is not actively exploited in the wild and no public proof-of-concept exploits have been released. It requires local system access and specific hardware with the cx23885 capture card.

What versions of Kernel are affected by CVE-2022-49524?

Linux kernel versions 5.18.0 through 5.18.2 are vulnerable. Kernel version 5.18.3 and all later versions include the fix.

How do I check if my server is vulnerable to CVE-2022-49524?

Run: uname -r - if the output shows kernel 5.18.0, 5.18.1, or 5.18.2, you are vulnerable. Additionally, check if the cx23885 driver is present with: lsmod | grep cx23885

Does Defensia detect CVE-2022-49524?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If the Linux kernel package is installed on a monitored server, CVE-2022-49524 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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