CVE-2026-43089
Published May 6, 2026
Modified May 6, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: xfrm_user: fix info leak in build_mapping() struct xfrm_usersa_id has a one-byte padding hole after the proto field, which ends up never getting set to zero before copying out to userspace. Fix that up by zeroing out the whole structure before setting individual variables.
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EPSS — Exploit Prediction
0.0001
Probability of exploitation
0.02%
Percentile rank
EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.
References
Other References
https://git.kernel.org/stable/c/1beb76b2053b68c491b78370794b8ff63c8f8c02
https://git.kernel.org/stable/c/5a1a4b049ddde41466ccac0daeec326254b133f2
https://git.kernel.org/stable/c/700c9622b23c33b5933e6dcea816492c064e4e10
https://git.kernel.org/stable/c/d3125c541a96fb3c0fc7210112684baf22b6c24d
https://git.kernel.org/stable/c/f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c
Frequently Asked Questions
What is CVE-2026-43089? +
In the Linux kernel, the following vulnerability has been resolved:
xfrm_user: fix info leak in build_mapping()
struct xfrm_usersa_id has a one-byte padding hole after the proto
field, which ends up never getting set to zero before copying out to
userspace. Fix that up by zeroing out the whole structure before
setting individual variables.
How do I check if I'm vulnerable to CVE-2026-43089? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.