high CVSS 7.8

CVE-2022-48854·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: net: arc_emac: Fix use after free in arc_mdio_probe() If bus->state is equal to MDIOBUS_ALLOCATED, mdiobus_free(bus) will free the "bus". But bus->name is still used in the next line, which will lead to a use after free. We can fix it by putting the name in a local variable and make the bus->name point to the rodata section "name",then use the name in the error message without referring to bus to avoid the uaf.

Severity
high
Software
Kernel
Fixed in
5.16.15
Published
2024-07-16

Affected versions

From: 5.16

Until: 5.16.15

Fixed in: 5.16.15

How to fix this CVE

Update your Linux kernel to version 5.16.15 or later to resolve a use-after-free vulnerability in the arc_emac network driver's MDIO probe function. Systems running kernel versions 5.16 through 5.16.14 should prioritize this patch to prevent potential memory corruption during network interface initialization. Apply the update through your distribution's package manager and reboot to activate the patched kernel.

sudo dnf update kernel && sudo reboot

Defensia detects this vulnerability

How to check if you are affected

  1. Step 1: Check your current kernel version with 'uname -r' and compare against the affected range (5.16.0 to 5.16.14)
  2. Step 2: Verify if arc_emac driver is loaded by running 'lsmod | grep arc_emac' or 'ethtool -i <interface>' to identify the driver
  3. Step 3: Search system logs for arc_emac-related errors using 'dmesg | grep -i arc_emac' or 'journalctl -u kernel | grep arc_emac'
  4. Step 4: After kernel update, confirm the fix by running 'uname -r' to verify version 5.16.15 or later is running

FAQ

What is CVE-2022-48854?

CVE-2022-48854 is a use-after-free vulnerability in the Linux kernel's arc_emac network driver that occurs during the MDIO bus initialization when memory is incorrectly freed but subsequently accessed, potentially causing kernel memory corruption.

Is CVE-2022-48854 being actively exploited?

No, according to CISA's Known Exploited Vulnerabilities catalog, CVE-2022-48854 is not actively exploited in the wild and no public exploits are currently available.

What versions of Kernel are affected by CVE-2022-48854?

Linux kernel versions 5.16 through 5.16.14 are affected. Version 5.16.15 and later contain the fix.

How do I check if my server is vulnerable to CVE-2022-48854?

Run 'uname -r' to check your kernel version; if it shows 5.16.0 through 5.16.14, your system is vulnerable. Additionally, verify if the arc_emac driver is in use with 'lsmod | grep arc_emac'.

Does Defensia detect CVE-2022-48854?

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-2022-48854 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-2022-48716CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: ASoC: codecs: wcd938x: fix incorrect used of portid Mixer controls have the channel id in mixer->reg, which is not same as port id. port id should be derived from chan_info array. So fix this. Without this, its possible that we could corrupt struct wcd938x_sdw_priv by accessing port_map array out of range with channel id instead of port id.
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.
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-2024-38541CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: of: module: add buffer overflow check in of_modalias() In of_modalias(), if the buffer happens to be too small even for the 1st snprintf() call, the len parameter will become negative and str parameter (if not NULL initially) will point beyond the buffer's end. Add the buffer overflow check after the 1st snprintf() call and fix such check after the strlen() call (accounting for the terminating NUL char).

References

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