high CVSS 7

CVE-2024-50061·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: i3c: master: cdns: Fix use after free vulnerability in cdns_i3c_master Driver Due to Race Condition In the cdns_i3c_master_probe function, &master->hj_work is bound with cdns_i3c_master_hj. And cdns_i3c_master_interrupt can call cnds_i3c_master_demux_ibis function to start the work. If we remove the module which will call cdns_i3c_master_remove to make cleanup, it will free master->base through i3c_master_unregister while the work mentioned above will be used. The sequence of operations that may lead to a UAF bug is as follows: CPU0 CPU1 | cdns_i3c_master_hj cdns_i3c_master_remove | i3c_master_unregister(&master->base) | device_unregister(&master->dev) | device_release | //free master->base | | i3c_master_do_daa(&master->base) | //use master->base Fix it by ensuring that the work is canceled before proceeding with the cleanup in cdns_i3c_master_remove.

Severity
high
Software
Kernel
Fixed in
6.11.4
Published
2024-10-21

Affected versions

From: 6.7

Until: 6.11.4

Fixed in: 6.11.4

How to fix this CVE

Update your Linux kernel to version 6.11.4 or later to patch a use-after-free vulnerability in the cdns_i3c_master driver that can be triggered during module removal. This race condition allows freed memory to be accessed by delayed work handlers, potentially leading to kernel crashes or code execution. Apply the update immediately if you are running kernel versions 6.7 through 6.11.3.

sudo dnf update kernel kernel-devel && sudo reboot

Defensia detects this vulnerability

How to check if you are affected

  1. Step 1: Check current kernel version with: uname -r
  2. Step 2: Verify if cdns_i3c_master module is loaded: lsmod | grep cdns_i3c
  3. Step 3: Search kernel logs for UAF or i3c-related errors: sudo journalctl -u kernel | grep -i 'use.*after.*free\|cdns_i3c\|kasan' | tail -50
  4. Step 4: Confirm the patch is applied by checking kernel config: grep -i 'CONFIG_I3C' /boot/config-$(uname -r) and verify kernel version is 6.11.4 or later

FAQ

What is CVE-2024-50061?

CVE-2024-50061 is a use-after-free vulnerability in the Linux kernel's cdns_i3c_master driver that occurs when a delayed work handler attempts to access memory that has already been freed during module removal. This race condition between device cleanup and asynchronous work execution can lead to kernel crashes or privilege escalation.

Is CVE-2024-50061 being actively exploited?

No, there is no evidence that CVE-2024-50061 is being actively exploited in the wild, and no public exploits are available. However, the vulnerability is high-severity and should be patched promptly as part of regular maintenance.

What versions of Kernel are affected by CVE-2024-50061?

Kernel versions 6.7 through 6.11.3 are vulnerable. The fix was released in version 6.11.4 and backported to stable branches.

How do I check if my server is vulnerable to CVE-2024-50061?

Run 'uname -r' to check your kernel version. If it falls between 6.7 and 6.11.3, and 'lsmod | grep cdns_i3c' shows the module is loaded, your system is vulnerable.

Does Defensia detect CVE-2024-50061?

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-2024-50061 will appear in your dashboard with remediation steps.

Related Kernel CVEs

CVE-2024-42256CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: cifs: Fix server re-repick on subrequest retry When a subrequest is marked for needing retry, netfs will call cifs_prepare_write() which will make cifs repick the server for the op before renegotiating credits; it then calls cifs_issue_write() which invokes smb2_async_writev() - which re-repicks the server. If a different server is then selected, this causes the increment of server->in_flight to happen against one record and the decrement to happen against another, leading to misaccounting. Fix this by just removing the repick code in smb2_async_writev(). As this is only called from netfslib-driven code, cifs_prepare_write() should always have been called first, and so server should never be NULL and the preparatory step is repeated in the event that we do a retry. The problem manifests as a warning looking something like: WARNING: CPU: 4 PID: 72896 at fs/smb/client/smb2ops.c:97 smb2_add_credits+0x3f0/0x9e0 [cifs] ... RIP: 0010:smb2_add_credits+0x3f0/0x9e0 [cifs] ... smb2_writev_callback+0x334/0x560 [cifs] cifs_demultiplex_thread+0x77a/0x11b0 [cifs] kthread+0x187/0x1d0 ret_from_fork+0x34/0x60 ret_from_fork_asm+0x1a/0x30 Which may be triggered by a number of different xfstests running against an Azure server in multichannel mode. generic/249 seems the most repeatable, but generic/215, generic/249 and generic/308 may also show it.
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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