high CVSS 7.8

CVE-2024-46831·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: net: microchip: vcap: Fix use-after-free error in kunit test This is a clear use-after-free error. We remove it, and rely on checking the return code of vcap_del_rule.

Severity
high
Software
Kernel
Fixed in
6.10.10
Published
2024-09-27

Affected versions

From: 6.7

Until: 6.10.10

Fixed in: 6.10.10

How to fix this CVE

Update your Linux kernel to version 6.10.10 or later to patch a use-after-free vulnerability in the Microchip VCAP driver's kunit test module. This memory safety issue could allow local attackers with low privileges to cause a denial of service or potentially escalate privileges. Systems running affected kernel versions 6.7 through 6.10.9 should prioritize this update.

sudo dnf update kernel kernel-devel && sudo reboot

Defensia detects this vulnerability

How to check if you are affected

  1. Check your installed kernel version by running: uname -r
  2. Verify if Microchip VCAP driver is loaded: lsmod | grep vcap
  3. Search kernel logs for memory corruption indicators: sudo dmesg | grep -i 'use-after-free\|memory\|fault'
  4. Confirm the fix by verifying the kernel version is 6.10.10 or later: uname -r | grep -E '6\.(10\.[1-9][0-9]|1[1-9]|[2-9][0-9])'
  5. Review system logs for crashes in vcap test module: sudo grep -i 'vcap\|kunit' /var/log/kern.log

FAQ

What is CVE-2024-46831?

CVE-2024-46831 is a use-after-free memory vulnerability in the Microchip VCAP (VCAT and Policer) driver's kernel unit test implementation, affecting Linux kernel versions 6.7 through 6.10.9. This flaw occurs in the kunit test module when memory is accessed after it has been freed, potentially leading to system instability or privilege escalation.

Is CVE-2024-46831 being actively exploited?

No, CVE-2024-46831 is not listed as actively exploited in the CISA Known Exploited Vulnerabilities catalog, and no public exploits are currently available. However, the vulnerability still poses a risk to systems running the affected kernel versions.

What versions of Kernel are affected by CVE-2024-46831?

Linux kernel versions 6.7 through 6.10.9 are vulnerable to CVE-2024-46831. The vulnerability was fixed in kernel version 6.10.10 and later releases.

How do I check if my server is vulnerable to CVE-2024-46831?

Run 'uname -r' to check your kernel version. If the output shows a version between 6.7 and 6.10.9, your system is vulnerable. Additionally, check if the Microchip VCAP driver is present by running 'lsmod | grep vcap'.

Does Defensia detect CVE-2024-46831?

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-2024-46831 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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