high CVSS 7.5

CVE-2024-49997·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: net: ethernet: lantiq_etop: fix memory disclosure When applying padding, the buffer is not zeroed, which results in memory disclosure. The mentioned data is observed on the wire. This patch uses skb_put_padto() to pad Ethernet frames properly. The mentioned function zeroes the expanded buffer. In case the packet cannot be padded it is silently dropped. Statistics are also not incremented. This driver does not support statistics in the old 32-bit format or the new 64-bit format. These will be added in the future. In its current form, the patch should be easily backported to stable versions. Ethernet MACs on Amazon-SE and Danube cannot do padding of the packets in hardware, so software padding must be applied.

Severity
high
Software
Kernel
Fixed in
6.11.3
Published
2024-10-21

Affected versions

From: 6.11

Until: 6.11.3

Fixed in: 6.11.3

How to fix this CVE

Update your Linux kernel to version 6.11.3 or later to patch a memory disclosure vulnerability in the Lantiq Ethernet driver. The vulnerability allows sensitive kernel memory to be exposed on the network when Ethernet frames are padded in software. Apply the security update as soon as possible, especially if your system uses Amazon-SE or Danube Ethernet MAC hardware that relies on software-based packet padding.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Check your kernel version: uname -r — if it shows 6.11.0, 6.11.1, or 6.11.2, your system is vulnerable
  2. Verify the lantiq_etop driver is loaded: lsmod | grep lantiq_etop — if output appears, your hardware may use this driver
  3. Check network interface details: ethtool -i <interface> — look for 'driver: lantiq_etop' to confirm affected hardware is present
  4. After patching, verify the new kernel is running: uname -r should show 6.11.3 or higher

FAQ

What is CVE-2024-49997?

This vulnerability allows uninitialized kernel memory to leak across the network when the Lantiq Ethernet driver pads short frames without zeroing the padding bytes. An attacker with network access can capture these frames to potentially obtain sensitive kernel data.

Is CVE-2024-49997 being actively exploited?

No, there is no evidence of active exploitation or public exploits available for this vulnerability as of the current date.

What versions of Kernel are affected by CVE-2024-49997?

Linux kernel versions 6.11.0 through 6.11.2 are vulnerable; the fix is included in kernel 6.11.3 and later.

How do I check if my server is vulnerable to CVE-2024-49997?

Run 'uname -r' and check if the output is 6.11.0, 6.11.1, or 6.11.2. Then verify if the lantiq_etop driver is loaded with 'lsmod | grep lantiq_etop'.

Does Defensia detect CVE-2024-49997?

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-2024-49997 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.
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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