high CVSS 7.1

CVE-2024-47686·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: ep93xx: clock: Fix off by one in ep93xx_div_recalc_rate() The psc->div[] array has psc->num_div elements. These values come from when we call clk_hw_register_div(). It's adc_divisors and ARRAY_SIZE(adc_divisors)) and so on. So this condition needs to be >= instead of > to prevent an out of bounds read.

Severity
high
Software
Kernel
Fixed in
6.11.2
Published
2024-10-21

Affected versions

From: 6.11

Until: 6.11.2

Fixed in: 6.11.2

How to fix this CVE

Update your Linux kernel to version 6.11.2 or later to address an off-by-one boundary check error in the EP93xx clock division rate calculation. This flaw could allow local attackers with minimal privileges to read out-of-bounds kernel memory or trigger a system crash. Systems running kernel versions 6.11 through 6.11.1 should prioritize patching immediately.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Step 1: Check your kernel version by running `uname -r` and confirm if it falls within 6.11.0 to 6.11.1
  2. Step 2: Verify the EP93xx clock driver is compiled into your kernel or loaded as a module with `grep -i ep93xx /boot/config-$(uname -r)` or `lsmod | grep ep93xx`
  3. Step 3: Search system logs for clock rate recalculation errors or memory access violations using `dmesg | grep -i 'clock\|rate\|recalc'` and `journalctl -xe | grep kernel`
  4. Step 4: After applying the kernel update, reboot and confirm the new version with `uname -r` to ensure 6.11.2 or later is running

FAQ

What is CVE-2024-47686?

This vulnerability is an off-by-one boundary error in the EP93xx clock rate calculation function that allows reading one element past the end of the divisor array, potentially exposing sensitive kernel memory or causing a system hang.

Is CVE-2024-47686 being actively exploited?

No, this vulnerability is not currently being actively exploited in the wild, and no public exploits are available.

What versions of Kernel are affected by CVE-2024-47686?

Linux kernel versions 6.11.0, 6.11.1, and 6.11.2-rc versions before the fix are affected; versions 6.11.2 and later include the patch.

How do I check if my server is vulnerable to CVE-2024-47686?

Run `uname -r` to check your kernel version; if it shows 6.11.0 or 6.11.1 and your system uses EP93xx SoC hardware, your system is vulnerable.

Does Defensia detect CVE-2024-47686?

Yes — Defensia's CVE advisory scanner compares installed kernel package versions against the NVD database. If kernel is installed on a monitored server, CVE-2024-47686 will appear in your dashboard with remediation steps.

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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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