high CVSS 7.8

CVE-2022-48873·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Don't remove map on creater_process and device_release Do not remove the map from the list on error path in fastrpc_init_create_process, instead call fastrpc_map_put, to avoid use-after-free. Do not remove it on fastrpc_device_release either, call fastrpc_map_put instead. The fastrpc_free_map is the only proper place to remove the map. This is called only after the reference count is 0.

Severity
high
Software
Kernel
Fixed in
6.1.8
Published
2024-08-21

Affected versions

From: 5.16

Until: 6.1.8

Fixed in: 6.1.8

How to fix this CVE

Update your Linux kernel to version 6.1.8 or later to resolve a critical memory safety issue in the fastrpc subsystem. The vulnerability involves improper reference counting in the fastrpc map handling during process initialization and device release, which can lead to use-after-free conditions. Apply the patch immediately on systems running kernel versions 5.16 through 6.1.7.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Step 1: Check the current kernel version with `uname -r` and compare it against the affected range (5.16 to 6.1.7)
  2. Step 2: Verify fastrpc is in use by checking `cat /proc/modules | grep fastrpc` or inspect device nodes with `ls -la /dev/fastrpc*`
  3. Step 3: Search kernel logs for fastrpc-related warnings using `dmesg | grep -i fastrpc` or `journalctl -u kernel | grep fastrpc`
  4. Step 4: After patching, confirm the new kernel version is running with `uname -r` and reboot to ensure all memory references are cleaned

FAQ

What is CVE-2022-48873?

CVE-2022-48873 is a use-after-free vulnerability in the Linux kernel's fastrpc subsystem where improper reference counting during process creation and device shutdown can allow local attackers to trigger memory corruption and potentially escalate privileges.

Is CVE-2022-48873 being actively exploited?

No, this vulnerability is not listed on CISA's Known Exploited Vulnerabilities catalog and no public exploits are currently available, though the high CVSS score (7.8) indicates significant local privilege escalation risk.

What versions of Kernel are affected by CVE-2022-48873?

Linux kernel versions 5.16 through 6.1.7 are vulnerable. Kernel 6.1.8 and later contain the fix.

How do I check if my server is vulnerable to CVE-2022-48873?

Run `uname -r` and check if your version falls between 5.16 and 6.1.7. If the fastrpc module is loaded (`grep fastrpc /proc/modules`), your system is potentially at risk.

Does Defensia detect CVE-2022-48873?

Yes — Defensia's CVE advisory scanner compares installed kernel versions against the NVD database. If a vulnerable kernel is detected on monitored systems, CVE-2022-48873 will appear in your dashboard with remediation steps and patch recommendations.

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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