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CVE-2026-98283: Linux

8.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: KVM: PPC: Book3S HV: fix use-after-free in kvmhv_emulate_tlbie_all_lpid() kvmhv_emulate_tlbie_all_lpid() iterates the nested-guest IDR and drops mmu_lock before calling kvmhv_emulate_tlbie_lpid(), but does not hold a reference on the kvm_nested_guest pointer obtained from the IDR. A concurrent vCPU issuing a single-LPID tlbie (is=2, ric=2) can race through kvmhv_flush_nested() -> kvmhv_remove_nested() -> idr_remove / --refcnt -> kvmhv_release_nested() -> kfree(gp) in that window, leaving the iterating vCPU with a dangling pointer. The subsequent mutex_lock(&gp->tlb_lock) and accesses to gp->shadow_pgtable, gp->shadow_lpid and gp->l1_host all touch freed memory. The free path is fully L1-controlled. Fix this by incrementing gp->refcnt inside the loop before dropping mmu_lock, mirroring what kvmhv_get_nested() does, and releasing the reference with kvmhv_put_nested() after the per-guest work completes. This is the same get/put discipline already used at every other call site that drops mmu_lock while holding a nested-guest pointer.

    Засегнати продукти

    • Linux Linux: e3b6b4661527e821ffbe3db83952fdb1e6e47c49 преди 4d8f7b1f586375df8bce23a0909566ad5e852259; e3b6b4661527e821ffbe3db83952fdb1e6e47c49 преди e37fba1ba69385cff2d0e60b371ee19e7d1852d1; e3b6b4661527e821ffbe3db83952fdb1e6e47c49 преди 24b634852413229bb8340d908b115c3365f3a247; e3b6b4661527e821ffbe3db83952fdb1e6e47c49 преди fbf69b7d0555ee83c871f58750770f74b7179ad1; e3b6b4661527e821ffbe3db83952fdb1e6e47c49 преди ec2d7a52b3996ae81131617b4afc0af31583c1b4; e3b6b4661527e821ffbe3db83952fdb1e6e47c49 преди 51938dfa8a51a4f85328413fca9b6e21f9d2d088
    • Linux Linux: 4.20; преди 4.20; 6.1.189 до 6.1.*; 6.6.158 до 6.6.*; 6.12.112 до 6.12.*; 6.18.54 до 6.18.*; 7.2.8 до 7.2.*; 7.3 до *

    История

    • 6 октомври 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-98283: Linux | freedomonline.bg