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CVE-2026-74351: Linux

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CVSS

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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: ocfs2: rebase copied fsdlm LVB pointers in locking_state The locking_state debugfs iterator snapshots struct ocfs2_lock_res by value under ocfs2_dlm_tracking_lock and later formats that copy in ocfs2_dlm_seq_show(). That is fine for the inline fields, but the userspace fsdlm stack stores the LVB through lksb_fsdlm.sb_lvbptr. Once the iterator drops the tracking lock, a copied non-NULL sb_lvbptr still points into the original lockres owner, so teardown can free that container before the debugfs dump walks the raw LVB bytes. Rebase the copied sb_lvbptr to the copied l_lksb before dumping the raw LVB. The seq snapshot already carries the inline LVB storage reserved in struct ocfs2_dlm_lksb, so the debugfs reader can dump the copied bytes without borrowing the original lockres lifetime. The buggy scenario involves two paths, with each column showing the order within that path: locking_state reader: lockres teardown: 1. ocfs2_dlm_seq_start()/next() 1. file release or another owner copies struct ocfs2_lock_res teardown reaches 2. ocfs2_dlm_seq_show() formats ocfs2_lock_res_free() the copied row 2. the lockres is removed from the 3. ocfs2_dlm_lvb() follows the tracking list copied sb_lvbptr 3. the owner frees the original lockres container Validation reproduced this kernel report: KASAN slab-use-after-free in ocfs2_dlm_seq_show+0x1bd/0x430 RIP: 0033:0x7f8ec4b1e29d The buggy address belongs to the object at ffff88810a1e0800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 368 bytes inside of freed 1024-byte region [ffff88810a1e0800, ffff88810a1e0c00) Read of size 1 Call trace: dump_stack_lvl+0x66/0xa0 print_report+0xce/0x630 ocfs2_dlm_seq_show+0x1bd/0x430 (fs/ocfs2/dlmglue.c:3137) srso_alias_return_thunk+0x5/0xfbef5

    Засегнати продукти

    • Linux Linux: cf4d8d75d8aba537a19b313a9364fd08ddbd5622 преди 185427b5f7a209254c85c18aad5a4a8e009b2f30; cf4d8d75d8aba537a19b313a9364fd08ddbd5622 преди 07aa4a8ebacde3d0ba50f60d2964f274ee7629bc; cf4d8d75d8aba537a19b313a9364fd08ddbd5622 преди e037c1250cc90e7aacb002357d1b0399fc65ecfc; cf4d8d75d8aba537a19b313a9364fd08ddbd5622 преди 6b38a5b8ee951e5b244e9a3c3d28d0f5e7c51411; cf4d8d75d8aba537a19b313a9364fd08ddbd5622 преди 8614a8f7e81edd34c9f67e454e7024fd12a2a341; cf4d8d75d8aba537a19b313a9364fd08ddbd5622 преди bb44a7690a4d553da705919cf666a80f5ca9011c; cf4d8d75d8aba537a19b313a9364fd08ddbd5622 преди 610a0d2a35496738e1472fb0f318d5008a1c634f; cf4d8d75d8aba537a19b313a9364fd08ddbd5622 преди 93612d48fa42b3d1a637eb9279e15281c611c000
    • Linux Linux: 2.6.26; преди 2.6.26; 5.10.261 до 5.10.*; 5.15.212 до 5.15.*; 6.1.178 до 6.1.*; 6.6.145 до 6.6.*; 6.12.97 до 6.12.*; 6.18.40 до 6.18.*; 7.1.5 до 7.1.*; от 7.2 нататък

    История

    • 15 август 2026 Публикувано

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    Първоизточници

    CVE-2026-74351: Linux | freedomonline.bg