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CVE-2026-63804: Linux

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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: gfs2: fix use-after-free in gfs2_qd_dealloc gfs2_qd_dealloc(), called as an RCU callback from gfs2_qd_dispose(), accesses the superblock object sdp through qd->qd_sbd after freeing qd. It does so to decrement sd_quota_count and wake up sd_kill_wait. However, by the time the RCU callback runs, gfs2_put_super() may have already freed sdp via free_sbd(). This can happen when gfs2_quota_cleanup() is called during unmount: it disposes of quota objects via call_rcu() and then waits on sd_kill_wait with a 60-second timeout. If the timeout expires, or if gfs2_gl_hash_clear() triggers additional qd_put() calls that schedule more RCU callbacks after the wait completes, gfs2_put_super() will proceed to free the superblock while RCU callbacks referencing it are still pending. Add an rcu_barrier() before free_sbd() in gfs2_put_super() to ensure all pending RCU callbacks (including gfs2_qd_dealloc) have completed before the superblock is freed.

    Засегнати продукти

    • Linux Linux: a475c5dd16e57c570113eccba51955b5df8bb052 преди 4fe388218826df8607ae41a6305df67db08a9093; a475c5dd16e57c570113eccba51955b5df8bb052 преди 8745d9f7e1682c39f0a1578895ac74205e2a6757; a475c5dd16e57c570113eccba51955b5df8bb052 преди b85ef03f726b15047a6fa6d11b639bdf6c0ee4f0; a475c5dd16e57c570113eccba51955b5df8bb052 преди 9d0d5ba20cad661f7f287d4c66d2c19022ce2fd0; a475c5dd16e57c570113eccba51955b5df8bb052 преди f9c9ec2c319f843b70ecdf939d48b52d189bc081
    • Linux Linux: 6.6; преди 6.6; 6.6.144 до 6.6.*; 6.12.95 до 6.12.*; 6.18.38 до 6.18.*; 7.1.3 до 7.1.*; от 7.2 нататък

    История

    • 19 юли 2026 Публикувано

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    CVE-2026-63804: Linux | freedomonline.bg