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CVE-2026-89926

KVM: s390: Fix length check __import_wp_info()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, and 1 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix length check __import_wp_info() struct kvm_hw_breakpoint::len is a __u64 that is fully controlled by user space. This is then assigned to wp_info->len, which is an int. The bounds check is done on the truncated value while the allocation uses the untruncated one: wp_info->len = bp_data->len; [...] if (wp_info->len < 0 || wp_info->len > MAX_WP_SIZE) return -EINVAL; wp_info->old_data = kmalloc(bp_data->len, GFP_KERNEL_ACCOUNT); Use the validated value for the allocation as intended. Without this fix userspace can trigger >4GB allocations which will fail and result in a WARN due to MAX_PAGE_ORDER.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 27291e2165b6de70c476b7b675308113edd69a60 · fixed in aef540194effd768bed0bd2e6a74fe135a3d7c3a; From 27291e2165b6de70c476b7b675308113edd69a60 · fixed in 71153d3262517e1c02c3a66aa5094f279b2d1454; From 27291e2165b6de70c476b7b675308113edd69a60 · fixed in fec89d327d9b2b669b5bbdac209386c6317c3722; From 27291e2165b6de70c476b7b675308113edd69a60 · fixed in b94ab9caa5d72c78226121cccff5e33f946da900; From 27291e2165b6de70c476b7b675308113edd69a60 · fixed in beb9c55af609c4c7308259d7191688c75a4e3d4a; From 27291e2165b6de70c476b7b675308113edd69a60 · fixed in 3fe801db90bdeefb0bbdda42d832846b53f64f8a; From 27291e2165b6de70c476b7b675308113edd69a60 · fixed in 4c07680a467e2f7697245bcd11691bffb2a6f0ed

  • Linux Linux

    3.16

  • KernelLinux

    From 3.16.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.51; From 6.19.0 · fixed in 7.2.5

References 7

git.kernel.org