medium CVSS 5.5

CVE-2024-40934·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: HID: logitech-dj: Fix memory leak in logi_dj_recv_switch_to_dj_mode() Fix a memory leak on logi_dj_recv_send_report() error path.

Severity
medium
Software
Kernel
Fixed in
6.9.6
Published
2024-07-12

Affected versions

From: 6.7

Until: 6.9.6

Fixed in: 6.9.6

How to fix this CVE

Update your Linux kernel to version 6.9.6 or later to resolve a memory leak vulnerability in the Logitech DJ HID driver that could lead to denial of service. Systems running kernel versions 6.7 through 6.9.5 should prioritize this update to prevent potential resource exhaustion from the affected code path.

sudo dnf update kernel kernel-core

Defensia detects this vulnerability

How to check if you are affected

  1. Step 1: Check your kernel version by running `uname -r`. If the version is between 6.7 and 6.9.5, your system is vulnerable.
  2. Step 2: Verify if a Logitech DJ receiver is connected by running `lsusb | grep -i logitech` or checking `dmesg | grep hid_logitech_dj`.
  3. Step 3: Search system logs for memory allocation errors using `grep -i 'logi_dj_recv' /var/log/kern.log` or `journalctl -g 'logi_dj'` to identify exploitation attempts.
  4. Step 4: After patching, confirm the new kernel version with `uname -r` and reboot if necessary with `sudo reboot`.

FAQ

What is CVE-2024-40934?

CVE-2024-40934 is a memory leak vulnerability in the Linux kernel's Logitech DJ HID (Human Interface Device) driver that occurs when the device mode switching function fails to properly release allocated memory on error conditions, potentially leading to denial of service through resource exhaustion.

Is CVE-2024-40934 being actively exploited?

No, CVE-2024-40934 is not currently listed in CISA's Known Exploited Vulnerabilities (KEV) catalog and no public exploits are available, though systems should still be patched promptly as a precaution.

What versions of Kernel are affected by CVE-2024-40934?

Linux kernel versions 6.7, 6.8, 6.9, and 6.9.5 and earlier are vulnerable. The vulnerability was resolved in kernel version 6.9.6.

How do I check if my server is vulnerable to CVE-2024-40934?

Run `uname -r` to display your kernel version. If it shows a version between 6.7 and 6.9.5, your system is vulnerable. Additionally, check if Logitech HID devices are present with `lsusb | grep -i logitech`.

Does Defensia detect CVE-2024-40934?

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-2024-40934 will appear in your dashboard with remediation steps.

Related Kernel CVEs

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CVE-2026-64439CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: crypto: krb5 - filter out async aead implementations at alloc krb5_aead_encrypt(), krb5_aead_decrypt() in rfc3961_simplified.c and rfc8009_encrypt(), rfc8009_decrypt() in rfc8009_aes2.c set a NULL completion callback and treat any negative return from crypto_aead_{encrypt,decrypt}() as terminal, falling through to kfree_sensitive(buffer). When the encrypt_name resolves to an async AEAD instance the request returns -EINPROGRESS, the buffer is freed while the backend's worker still holds a pointer, and the worker dereferences the freed slab on completion. KASAN report under UML+SLUB with a synthetic async aead backend bound to krb5->encrypt_name: BUG: KASAN: slab-use-after-free in t5_stub_complete+0x7d/0xc7 The helpers were written synchronously, so filter the async instances out at allocation time instead of plumbing crypto_wait_req() through every call site. Reachable via net/rxrpc/rxgk.c, fs/afs/cm_security.c and net/ceph/crypto.c on systems with an async AEAD provider bound to the krb5 enctype name.
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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