high CVSS 7 EPSS <0.1%

CVE-2024-26872·Kernel vulnerability

In the Linux kernel, the following vulnerability has been resolved: RDMA/srpt: Do not register event handler until srpt device is fully setup Upon rare occasions, KASAN reports a use-after-free Write in srpt_refresh_port(). This seems to be because an event handler is registered before the srpt device is fully setup and a race condition upon error may leave a partially setup event handler in place. Instead, only register the event handler after srpt device initialization is complete.

Severity
high
Software
Kernel
Fixed in
6.8.2
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 2% 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-2024-26872 scores 7 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: 6.8

Until: 6.8.2

Fixed in: 6.8.2

How to fix this CVE

Update the Linux kernel to version 6.8.2 or later to resolve a use-after-free vulnerability in the RDMA/srpt subsystem. The vulnerability occurs due to premature event handler registration before device initialization completes, creating a race condition window. Apply the kernel update immediately and reboot your system to mitigate this high-severity flaw.

sudo dnf update kernel kernel-devel

Defensia detects this vulnerability

How to check if you are affected

  1. Step 1: Check installed kernel version with `uname -r` and verify if it falls within 6.8.0 to 6.8.2
  2. Step 2: Verify RDMA/srpt module is loaded by running `lsmod | grep srpt` and `lsmod | grep rdma`
  3. Step 3: Search kernel logs for use-after-free or srpt-related errors with `sudo dmesg | grep -i 'srpt\|use-after-free\|kasan'`
  4. Step 4: After patching, confirm kernel version with `uname -r` returns 6.8.2 or later, and reload modules with `sudo modprobe -r ib_srpt && sudo modprobe ib_srpt`

FAQ

What is CVE-2024-26872?

CVE-2024-26872 is a use-after-free memory vulnerability in the Linux kernel's RDMA/srpt (SRP Target) subsystem where an event handler is registered before device initialization completes, allowing a race condition to leave partially initialized state in memory.

Is CVE-2024-26872 being actively exploited?

No, CVE-2024-26872 is not listed on the CISA KEV catalog and no public exploits are currently available. This is primarily a kernel stability issue affecting RDMA systems.

What versions of Kernel are affected by CVE-2024-26872?

Linux kernel versions 6.8.0 through 6.8.2 are affected. The vulnerability was resolved in kernel version 6.8.2 and later.

How do I check if my server is vulnerable to CVE-2024-26872?

Run `uname -r` to check your kernel version. If it shows 6.8.0, 6.8.1, or 6.8.2, and your system has RDMA/srpt modules enabled (`lsmod | grep srpt`), your system is vulnerable.

Does Defensia detect CVE-2024-26872?

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-2024-26872 will appear in your dashboard with remediation steps.

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References

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