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CVE-2026-64359: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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Време до експлоатация

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: nilfs2: reject CLEAN_SEGMENTS ioctl with out-of-range segment numbers Syzbot reported a hung task in nilfs_transaction_begin() where multiple tasks performing chmod() on a nilfs2 mount blocked for over 143 seconds waiting to acquire ns_segctor_sem for read: INFO: task syz.0.17:5918 blocked for more than 143 seconds. Call Trace: schedule+0x164/0x360 rwsem_down_read_slowpath+0x6d9/0x940 down_read+0x99/0x2e0 nilfs_transaction_begin+0x364/0x710 fs/nilfs2/segment.c:221 nilfs_setattr+0x124/0x2c0 fs/nilfs2/inode.c:921 notify_change+0xc1a/0xf40 chmod_common+0x273/0x4a0 do_fchmodat+0x12d/0x230 The writer holding ns_segctor_sem was a concurrent NILFS_IOCTL_CLEAN_SEGMENTS caller, stuck inside printk while emitting per-element warnings from nilfs_sufile_updatev(): __nilfs_msg+0x373/0x450 fs/nilfs2/super.c:78 nilfs_sufile_updatev+0x21c/0x6d0 fs/nilfs2/sufile.c:186 nilfs_sufile_freev fs/nilfs2/sufile.h:93 [inline] nilfs_free_segments fs/nilfs2/segment.c:1140 [inline] nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1261 [inline] nilfs_segctor_do_construct+0x1f55/0x76c0 nilfs_clean_segments+0x3bd/0xa50 nilfs_ioctl_clean_segments fs/nilfs2/ioctl.c:922 [inline] nilfs_ioctl+0x261f/0x2780 The root cause is that user-supplied segment numbers are not validated before nilfs_clean_segments() begins doing work; the range check on each segnum is performed deep inside the call chain by nilfs_sufile_updatev(), which emits a nilfs_warn() per invalid entry while still holding the segctor lock and the sufile mi_sem. Under load (repeated invocations across multiple mounts saturating the global printk path), the cumulative printk latency keeps ns_segctor_sem held long enough to trip the hung_task watchdog, blocking concurrent operations such as chmod() that need ns_segctor_sem for read. Fix by validating the contents of kbufs[4] in nilfs_clean_segments() immediately af

    Засегнати продукти

    • Linux Linux: 071cb4b81987a28c7ac2702003cff3e61684a630 преди 3ed388ec3b8922383d1e2d4432d7bd4cbbf8364e; 071cb4b81987a28c7ac2702003cff3e61684a630 преди 876c98e0fc65f071680c03c2e2ee3ef7ff9ca078; 071cb4b81987a28c7ac2702003cff3e61684a630 преди 39607452b1400c7bf748f15122df4d058b768c5b; 071cb4b81987a28c7ac2702003cff3e61684a630 преди 286f77d002a337735c0846d7480a82d9cda2aa31; 071cb4b81987a28c7ac2702003cff3e61684a630 преди 0789f0a6710713254a08f3a7d2ecbb6d1cbcf0aa; 071cb4b81987a28c7ac2702003cff3e61684a630 преди 223463c488b0554212a94de971ea538eb2805fc7; 071cb4b81987a28c7ac2702003cff3e61684a630 преди d26aef771b4f6923da9f89d6d5b70d8def5853de; 071cb4b81987a28c7ac2702003cff3e61684a630 преди 0e7a690fe435f8d5ea3feb7c1d8d73ba7e8b8aa9
    • Linux Linux: 2.6.31; преди 2.6.31; 5.10.261 до 5.10.*; 5.15.212 до 5.15.*; 6.1.178 до 6.1.*; 6.6.145 до 6.6.*; 6.12.96 до 6.12.*; 6.18.39 до 6.18.*; 7.1.4 до 7.1.*; от 7.2 нататък

    История

    • 25 юли 2026 Публикувано

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