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CVE-2026-89923: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Free guest debug data on vcpu destroy kvm_s390_clear_bp_data() is only called from kvm_arch_vcpu_ioctl_set_guest_debug(), i.e. when user space changes or disables debugging. A vCPU that is destroyed while hardware breakpoints are still armed - the normal case when the VMM just exits or crashes - leaks hw_bp_info, hw_wp_info and all old_data buffers, since generic KVM frees the vCPU right after kvm_arch_vcpu_destroy(). That is bounded by MAX_BP_COUNT entries, so roughly 8 KiB per vCPU, but it is unbounded over VM lifetimes. The allocations are GFP_KERNEL_ACCOUNT, so the charge also outlives the exiting process and pins dying memcgs. Fix by clearing the debug data on vCPU destruction. Calling it unconditionally is fine: struct kvm_vcpu is zero allocated, so for a vCPU that never enabled debugging the counters are 0 and the pointers NULL.

    Засегнати продукти

    • Linux Linux: 27291e2165b6de70c476b7b675308113edd69a60 преди 053f2068cf9b0654b651fed5ad7649d3deb982bf; 27291e2165b6de70c476b7b675308113edd69a60 преди 6c996b12bbe4a6023076e8eee3cfaf2cc99db76c; 27291e2165b6de70c476b7b675308113edd69a60 преди d6280fc540d8f4653c9b54a78cb747e128070f5e; 27291e2165b6de70c476b7b675308113edd69a60 преди 544a5a665019cef394ce8bda97fa7a2cab253781; 27291e2165b6de70c476b7b675308113edd69a60 преди 9a32c4c6a6c23b7f5bf765eb5b83ba7f64a8ec63; 27291e2165b6de70c476b7b675308113edd69a60 преди b5acacfdb8966abff91836c1c5bd7da59d8a526e; 27291e2165b6de70c476b7b675308113edd69a60 преди e4d8b7f176b976474e0800ba71ee2dfa3ce263c9; 27291e2165b6de70c476b7b675308113edd69a60 преди e7f698b09d4a7c36b299acf680fc50fe868e2bcd
    • Linux Linux: 3.16; преди 3.16; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.110 до 6.12.*; 6.18.51 до 6.18.*; 7.2.5 до 7.2.*; от 7.3 нататък

    История

    • 16 септември 2026 Публикувано

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    Първоизточници

    CVE-2026-89923: Linux | freedomonline.bg