high CVSS 7.8

CVE-2021-47609·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scpi: Fix string overflow in SCPI genpd driver Without the bound checks for scpi_pd->name, it could result in the buffer overflow when copying the SCPI device name from the corresponding device tree node as the name string is set at maximum size of 30. Let us fix it by using devm_kasprintf so that the string buffer is allocated dynamically.

Severity
high
Software
Kernel
Fixed in
5.15.11
Published
2024-06-19

Affected versions

From: 5.11

Until: 5.15.11

Fixed in: 5.15.11

How to fix this CVE

Update your Linux kernel to version 5.15.11 or later to fix a buffer overflow vulnerability in the ARM SCPI generic power domain driver. This issue affects kernel versions 5.11 through 5.15.10 where dynamic memory allocation was not properly implemented for device name handling. Apply the patch immediately to prevent potential local privilege escalation.

sudo dnf update kernel

Defensia detects this vulnerability

How to check if you are affected

  1. Check your kernel version with: uname -r — ensure it is at least 5.15.11 or higher
  2. Verify the ARM SCPI driver is loaded: lsmod | grep scpi_cpufreq — if output appears, the component is active
  3. Search system logs for SCPI-related errors: grep -i 'scpi\|genpd' /var/log/kern.log /var/log/syslog
  4. After patching, reboot and confirm the new kernel version: uname -r — should show 5.15.11 or later

FAQ

What is CVE-2021-47609?

This vulnerability is a buffer overflow in the ARM SCPI generic power domain driver where device names exceeding 30 characters could overflow a fixed-size buffer, potentially allowing local privilege escalation when the driver processes device tree node names.

Is CVE-2021-47609 being actively exploited?

No, CVE-2021-47609 is not listed in CISA's Known Exploited Vulnerabilities catalog and no public exploits are currently available, though the high CVSS score (7.8) warrants prompt patching.

What versions of Kernel are affected by CVE-2021-47609?

Linux kernel versions 5.11 through 5.15.10 are vulnerable; version 5.15.11 and later contain the fix.

How do I check if my server is vulnerable to CVE-2021-47609?

Run 'uname -r' and compare your kernel version against 5.15.11 — if your version falls between 5.11.0 and 5.15.10, you are vulnerable.

Does Defensia detect CVE-2021-47609?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If Kernel is installed on a monitored server, CVE-2021-47609 will appear in your dashboard with remediation steps.

Related Kernel CVEs

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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-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.

References

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