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CVE-2026-89690: Linux

7.8

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: nfsd: defer vfree of compound ops to fix rpc_status UAF The rpc_status netlink dumpit walks every in-flight svc_rqst under rcu_read_lock and, for NFSv4 requests, reads opnums out of args->ops[]. But args->ops is a separate vmalloc buffer freed synchronously by vfree() in nfsd4_release_compoundargs() at the end of every compound. The dumpit's rcu_read_lock pins the svc_rqst struct itself (freed via kfree_rcu), but nothing defers the vfree of the ops buffer across the RCU grace period. A concurrent compound completion can therefore free the buffer while the dumpit is reading it — a use-after-free on vmalloc memory. The trailing seqcount recheck (smp_load_acquire of rq_status_counter) cannot undo a load that already retired against freed memory. Fix by replacing vfree(args->ops) with kvfree_rcu_mightsleep(), which defers the free until after an RCU grace period. This makes the existing rcu_read_lock in the dumpit sufficient to protect the read. The tradeoff is that completed compound ops buffers (up to 200 * sizeof(struct nfsd4_op)) persist in memory slightly longer, across one grace period, before being reclaimed.

    Засегнати продукти

    • Linux Linux: bd9d6a3efa9709e653aafbeb859289feccb8e70c преди 48f72aff24f7a7329209dc6cbc27c869f3e3595c; bd9d6a3efa9709e653aafbeb859289feccb8e70c преди 6703199f4d7e7f37d6a726a849eb358e8fae72fb; bd9d6a3efa9709e653aafbeb859289feccb8e70c преди 19413ccc45070a7270b9e25c2a258daf7f91de42; bd9d6a3efa9709e653aafbeb859289feccb8e70c преди fca26a3fc19ed02278aa2a150af82d43db0302cb
    • Linux Linux: 6.7; преди 6.7; 6.12.109 до 6.12.*; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

    История

    • 11 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-89690: Linux | freedomonline.bg