high CVSS 8.8

CVE-2024-43847·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: wifi: ath12k: fix invalid memory access while processing fragmented packets The monitor ring and the reo reinject ring share the same ring mask index. When the driver receives an interrupt for the reo reinject ring, the monitor ring is also processed, leading to invalid memory access. Since monitor support is not yet enabled in ath12k, the ring mask for the monitor ring should be removed. Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.1.1-00209-QCAHKSWPL_SILICONZ-1

Severity
high
Software
Kernel
Fixed in
6.10.3
Published
2024-08-17

Affected versions

From: 6.7

Until: 6.10.3

Fixed in: 6.10.3

How to fix this CVE

Update your Linux kernel to version 6.10.3 or later to resolve a critical memory access flaw in the ath12k Wi-Fi driver that occurs when processing fragmented packets. The vulnerability stems from improper ring mask handling between the monitor ring and reo reinject ring, causing kernel memory corruption during interrupt processing. Apply the patch immediately if you are running kernel versions 6.7 through 6.10.2 with ath12k wireless hardware.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Check your current kernel version: uname -r — ensure it is 6.10.3 or later
  2. Verify if ath12k module is loaded: lsmod | grep ath12k — if present, the vulnerable code path is available
  3. Check dmesg for memory access violations: sudo dmesg | grep -i 'segfault\|fault\|oops' — look for timestamps correlating with wireless driver initialization
  4. Confirm the fix: grep -r 'ring mask for the monitor ring' /boot/config-$(uname -r) or check kernel commit 073f9f249eecd64ab9d59c91c4a23cfdcc02afe4 is applied via git log

FAQ

What is CVE-2024-43847?

CVE-2024-43847 is a memory corruption vulnerability in the Linux kernel's ath12k Wi-Fi driver where shared ring mask indices between the monitor ring and reo reinject ring cause invalid memory access during packet fragmentation processing.

Is CVE-2024-43847 being actively exploited?

No, there is no evidence of active exploitation in the wild, and no public exploit code is available. However, the high CVSS score (8.8) indicates significant potential impact if leveraged.

What versions of Kernel are affected by CVE-2024-43847?

Linux kernel versions 6.7 through 6.10.2 are affected. Version 6.10.3 and later contain the fix.

How do I check if my server is vulnerable to CVE-2024-43847?

Run uname -r to check your kernel version. If it shows 6.7.x through 6.10.2 AND lsmod | grep ath12k shows the module is loaded, your system is vulnerable.

Does Defensia detect CVE-2024-43847?

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-2024-43847 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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