high CVSS 7.8 EPSS <0.1%

CVE-2024-42147·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: crypto: hisilicon/debugfs - Fix debugfs uninit process issue During the zip probe process, the debugfs failure does not stop the probe. When debugfs initialization fails, jumping to the error branch will also release regs, in addition to its own rollback operation. As a result, it may be released repeatedly during the regs uninit process. Therefore, the null check needs to be added to the regs uninit process.

Severity
high
Software
Kernel
Fixed in
6.9.9
Published

How likely is exploitation

FIRST's Exploit Prediction Scoring System puts the probability of this CVE being exploited in the next 30 days at <0.1% — higher than 4% of all published CVEs. EPSS is an independent forecast of exploitation, not a severity rating: it says nothing about how much damage a successful attack does, which is what a CVSS score measures.

Read the two together. CVE-2024-42147 scores 7.8 on CVSS, so a successful attack would be serious — but at <0.1%, almost nobody is currently attempting it. That is a different situation from a flaw under mass exploitation, and it is usually the difference between patching on your next maintenance window and patching tonight.

Affected versions

From: 6.7

Until: 6.9.9

Fixed in: 6.9.9

How to fix this CVE

Update your Linux kernel to version 6.9.9 or later to resolve a double-free vulnerability in the HiSilicon crypto debugfs initialization logic. This vulnerability occurs when debugfs setup fails during device probe, causing memory regions to be released twice. Ensure your system is running the patched kernel version to prevent potential kernel crashes or memory corruption.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Step 1: Check your kernel version with: uname -r (vulnerable if output shows 6.7 through 6.9.8)
  2. Step 2: Verify HiSilicon crypto device is present: lspci | grep -i hisilicon or cat /proc/crypto | grep hisilicon
  3. Step 3: Search kernel logs for debugfs errors: dmesg | grep -i 'debugfs\|hisilicon' or journalctl -k | grep -i 'debugfs\|hisilicon'
  4. Step 4: After patching, confirm kernel version: uname -r (should show 6.9.9 or later)

FAQ

What is CVE-2024-42147?

CVE-2024-42147 is a double-free memory corruption vulnerability in the Linux kernel's HiSilicon crypto debugfs module. When debugfs initialization fails during device probe, the error handling path attempts to release memory regions that are later freed again during cleanup, potentially causing kernel panics or memory corruption.

Is CVE-2024-42147 being actively exploited?

No, there is no evidence of active exploitation or public exploits available for this vulnerability. However, the high CVSS score (7.8) indicates it should be patched promptly as it affects system stability.

What versions of Kernel are affected by CVE-2024-42147?

Linux kernel versions 6.7 through 6.9.8 are vulnerable. The vulnerability is resolved in kernel 6.9.9 and later.

How do I check if my server is vulnerable to CVE-2024-42147?

Run 'uname -r' to display your kernel version. If it shows a version between 6.7 and 6.9.8, your system is vulnerable. Additionally, verify HiSilicon crypto support is enabled with 'lspci | grep -i hisilicon'.

Does Defensia detect CVE-2024-42147?

Yes — Defensia's CVE advisory scanner compares installed package versions against the NVD database. If Kernel is installed on a monitored server, CVE-2024-42147 will appear in your dashboard with remediation steps.

Related Kernel CVEs

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CVE-2026-53151CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix the ACK parser to extract the SACK table for parsing Fix modification of the received skbuff in rxrpc_input_soft_acks() and a potential incorrect access of the buffer in a fragmented UDP packet (the packet would probably have to be deliberately pre-generated as fragmented) when AF_RXRPC tries to extract the contents of the SACK table by copying out the contents of the SACK table into a buffer before attempting to parse AF_RXRPC assumes that it can just call skb_condense() and then validly access the SACK table from skb->data and that it will be a flat buffer - but skb_condense() can silently fail to do anything under some circumstances. Note that whilst rxrpc_input_soft_acks() should be able to parse extended ACKs, the rest of AF_RXRPC doesn't currently support that. Further, there's then no need to call skb_condense() in rxrpc_input_ack(), so don't.
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CVE-2026-53228CVSS 9.8In the Linux kernel, the following vulnerability has been resolved: ipv6: sit: reload inner IPv6 header after GSO offloads ipip6_tunnel_xmit() caches the inner IPv6 header pointer at function entry and continues using it after iptunnel_handle_offloads(). For GSO skbs, iptunnel_handle_offloads() calls skb_header_unclone(). When the skb header is cloned, skb_header_unclone() can call pskb_expand_head(), which may move the skb head. The pskb_expand_head() contract requires pointers into the skb header to be reloaded after the call. If the later skb_realloc_headroom() branch is not taken, SIT uses the stale iph6 pointer to read the inner hop limit and DS field. That can read from a freed skb head after the old head's remaining clone is released. Reload iph6 after the offload helper succeeds and before subsequent reads from the inner IPv6 header. Keep the existing reload after skb_realloc_headroom(), since that branch can also replace the skb.

References

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