high CVSS 7

CVE-2024-26730·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: hwmon: (nct6775) Fix access to temperature configuration registers The number of temperature configuration registers does not always match the total number of temperature registers. This can result in access errors reported if KASAN is enabled. BUG: KASAN: global-out-of-bounds in nct6775_probe+0x5654/0x6fe9 nct6775_core

Severity
high
Software
Kernel
Fixed in
6.7.7
Published
2024-04-03

Affected versions

From: 6.7

Until: 6.7.7

Fixed in: 6.7.7

How to fix this CVE

Update your Linux kernel to version 6.7.7 or later to resolve a memory access error in the nct6775 hwmon driver. This vulnerability affects systems running kernel versions 6.7 through 6.7.6 and can cause KASAN-detected out-of-bounds access when the driver probes temperature monitoring hardware. Apply the kernel update through your distribution's package manager and reboot your system to complete the remediation.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Step 1: Check your current kernel version with `uname -r` and verify if it falls between 6.7 and 6.7.6
  2. Step 2: Confirm the nct6775 driver is loaded by running `lsmod | grep nct6775` (applies mainly to systems with supported hwmon sensors)
  3. Step 3: Search kernel logs for KASAN errors related to nct6775_probe using `sudo dmesg | grep -A5 'nct6775_probe\|KASAN.*global-out-of-bounds'`
  4. Step 4: After updating, verify the new kernel version with `uname -r` to confirm it is 6.7.7 or later

FAQ

What is CVE-2024-26730?

This vulnerability is a memory access error in the Linux kernel's nct6775 hwmon driver where the number of temperature configuration registers is incorrectly mapped, causing out-of-bounds memory access that KASAN can detect. The issue occurs during driver probe initialization.

Is CVE-2024-26730 being actively exploited?

No, this vulnerability is not listed on the CISA KEV catalog and has no known public exploits. It is primarily a stability and reliability issue rather than a security attack vector.

What versions of Kernel are affected by CVE-2024-26730?

Linux kernel versions 6.7 through 6.7.6 are affected. The vulnerability was resolved in kernel version 6.7.7.

How do I check if my server is vulnerable to CVE-2024-26730?

Run `uname -r` to check your kernel version. If it shows 6.7.x where x is less than 7, your system is vulnerable. Also verify the nct6775 driver is present with `lsmod | grep nct6775`.

Does Defensia detect CVE-2024-26730?

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-2024-26730 will appear in your dashboard with remediation steps.

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CVE-2026-63993CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu() skb_tunnel_check_pmtu() can change skb->head. Reusing old_iph afer skb_tunnel_check_pmtu() can cause an UAF. Use instead ip_hdr(skb) as done in drivers/net/bareudp.c and drivers/net/geneve.c. Found by Sashiko.
CVE-2026-64046CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: net: tls: prevent chain-after-chain in plain text SG Sashiko points out that if end = 0 (start != 0) the current code will create a chain link to content type right after the wrap link: This would create a chain where the wrap link points directly to another chain link. The scatterlist API sg_next iterator does not recursively resolve consecutive chain links. meaning this is illegal input to crypto. The wrapping link is unnecessary if end = 0. end is the entry after the last one used so end = 0 means there's nothing pushed after the wrap: end start i v v v [ ]...[ ][ d ][ d ][ d ][ d ][rsv for wrap] Skip the wrapping in this case. TLS 1.3 can use the "wrapping slot" for it's chaining if end = 0. This avoids the chain-after-chain. Move the wrap chaining before marking END and chaining off content type, that feels like more logical ordering to me, but should not matter from functional perspective.
CVE-2026-64055CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: net: ethernet: cortina: Carry over frag counter The gmac_rx() NAPI poll function assembles packets in an SKB from a ring buffer. If the ring buffer gets completely emptied during a poll cycle, we exit gmac_rx(), but the packet is not yet completely assembled in the SKB, yet the fragment counter frag_nr is reset to zero on the next invocation. Solve this by making the RX fragment counter a part of the port struct, and carry it over between invocations. Reset the fragment counter only right after calling napi_gro_frags(), on error (after calling napi_free_frags()) or if stopping the port. Reset it in some place where not strictly necessary just to emphasize what is going on. This was found by Sashiko during normal patch review.

References

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