medium CVSS 5.7

CVE-2024-53240·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: xen/netfront: fix crash when removing device When removing a netfront device directly after a suspend/resume cycle it might happen that the queues have not been setup again, causing a crash during the attempt to stop the queues another time. Fix that by checking the queues are existing before trying to stop them. This is XSA-465 / CVE-2024-53240.

Severity
medium
Software
Kernel
Fixed in
6.12.6
Published
2024-12-24

Affected versions

From: 6.7

Until: 6.12.6

Fixed in: 6.12.6

How to fix this CVE

Update the Linux kernel to version 6.12.6 or later to resolve a crash that occurs when removing Xen netfront devices after suspend/resume cycles. The vulnerability stems from inadequate queue validation during device removal, which can lead to kernel panics on affected systems. Apply the patch immediately if your infrastructure relies on Xen virtualization.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Step 1: Check installed kernel version with `uname -r` and compare against 6.12.6 (vulnerable if 6.7 ≤ version < 6.12.6)
  2. Step 2: Verify if Xen netfront driver is loaded by running `lsmod | grep xennet` (if output appears, the component is present)
  3. Step 3: Search system logs for netfront-related crashes using `journalctl -b | grep -i xennet` or `dmesg | grep -i xennet`
  4. Step 4: After applying patches, confirm new kernel version with `uname -r` and verify it is 6.12.6 or later

FAQ

What is CVE-2024-53240?

CVE-2024-53240 is a medium-severity vulnerability in the Linux kernel's Xen netfront driver that causes a system crash when removing network devices immediately after a suspend/resume cycle, due to improper queue validation during cleanup operations.

Is CVE-2024-53240 being actively exploited?

No, there is no evidence of active exploitation or public exploits available for CVE-2024-53240. It remains a stability issue rather than a security threat used in the wild.

What versions of Kernel are affected by CVE-2024-53240?

Linux kernel versions 6.7 through 6.12.5 are affected. Version 6.12.6 and later contain the fix.

How do I check if my server is vulnerable to CVE-2024-53240?

Run `uname -r` to display your kernel version. If it falls between 6.7 and 6.12.5, and your system uses Xen virtualization (check with `lsmod | grep xen`), your server is vulnerable.

Does Defensia detect CVE-2024-53240?

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-2024-53240 will appear in your dashboard with remediation steps.

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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.
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References

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