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CVE-2025-68821: 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: fuse: fix readahead reclaim deadlock Commit e26ee4efbc79 ("fuse: allocate ff->release_args only if release is needed") skips allocating ff->release_args if the server does not implement open. However in doing so, fuse_prepare_release() now skips grabbing the reference on the inode, which makes it possible for an inode to be evicted from the dcache while there are inflight readahead requests. This causes a deadlock if the server triggers reclaim while servicing the readahead request and reclaim attempts to evict the inode of the file being read ahead. Since the folio is locked during readahead, when reclaim evicts the fuse inode and fuse_evict_inode() attempts to remove all folios associated with the inode from the page cache (truncate_inode_pages_range()), reclaim will block forever waiting for the lock since readahead cannot relinquish the lock because it is itself blocked in reclaim: >>> stack_trace(1504735) folio_wait_bit_common (mm/filemap.c:1308:4) folio_lock (./include/linux/pagemap.h:1052:3) truncate_inode_pages_range (mm/truncate.c:336:10) fuse_evict_inode (fs/fuse/inode.c:161:2) evict (fs/inode.c:704:3) dentry_unlink_inode (fs/dcache.c:412:3) __dentry_kill (fs/dcache.c:615:3) shrink_kill (fs/dcache.c:1060:12) shrink_dentry_list (fs/dcache.c:1087:3) prune_dcache_sb (fs/dcache.c:1168:2) super_cache_scan (fs/super.c:221:10) do_shrink_slab (mm/shrinker.c:435:9) shrink_slab (mm/shrinker.c:626:10) shrink_node (mm/vmscan.c:5951:2) shrink_zones (mm/vmscan.c:6195:3) do_try_to_free_pages (mm/vmscan.c:6257:3) do_swap_page (mm/memory.c:4136:11) handle_pte_fault (mm/memory.c:5562:10) handle_mm_fault (mm/memory.c:5870:9) do_user_addr_fault (arch/x86/mm/fault.c:1338:10) handle_page_fault (arch/x86/mm/fault.c:1481:3) exc_page_fault (arch/x86/mm/fault.c:1539:2) asm_exc_page_fault+0x22/0x27 Fix this deadlock by allocating ff->release_args and grabbing the reference on the inode whe

    Засегнати продукти

    • Linux Linux: a39f70d63f4373a598820d9491719e44cd60afe9 преди cbbf3f1bb9f834bb2acbb61ddca74363456e19cd; 7d38aa079ed859b73f4460aab89c7619b04963b8 преди 4703bc0e8cd3409acb1476a70cb5b7ff943cf39a; c7ec75f3cbf73bd46f479f7d6942585f765715da преди cf74785c00b8b1c0c4a9dd74bfa9c22d62e2d99f; e26ee4efbc79610b20e7abe9d96c87f33dacc1ff преди fbba8b00bbe4e4f958a2b0654cc1219a7e6597f6; e26ee4efbc79610b20e7abe9d96c87f33dacc1ff преди e0d6de83a4cc22bbac72713f3a58121af36cc411; e26ee4efbc79610b20e7abe9d96c87f33dacc1ff преди bd5603eaae0aabf527bfb3ce1bb07e979ce5bd50; 5.15.196 преди 5.15.198; 6.1.158 преди 6.1.160; 6.6.115 преди 6.6.120
    • Linux Linux: 6.9; преди 6.9; 5.15.198 до 5.15.*; 6.1.160 до 6.1.*; 6.6.120 до 6.6.*; 6.12.64 до 6.12.*; 6.18.3 до 6.18.*; 6.19 до *

    История

    • 13 януари 2026 Публикувано

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    CVE-2025-68821: Linux | freedomonline.bg