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CVE-2026-89723: 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: nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation Shuangpeng Bai reported that KASAN detected a slab-out-of-bounds error in nilfs_direct_propagate() during testing. Analysis revealed that after truncating a file, a node block immediately below the B-tree root was not deleted. Instead, it remained in the B-tree node cache in a dirty state. The log writer subsequently detected this block and incorrectly invoked nilfs_direct_propagate() on it, which is designed to handle only data blocks in direct mapping. B-tree nodes in the cache are managed by virtual block numbers, and their logical keys typically exceed the range expected by direct mapping. Consequently, processing such a node as a direct mapping entry triggers a slab-out-of-bounds access. The root cause is that when a B-tree mapping collapses into a direct mapping during truncation, an intermediate node block pointed to by the root node is left behind as garbage instead of being explicitly deleted. This resolves the issue by adding a nilfs_btree_discard() operation to delete the remaining intermediate node block during the conversion. A 'deform' flag is added to the bop_delete interface to explicitly signal that the deletion is part of a mapping transformation. This allows the B-tree mapping implementation to perform the necessary cleanup and discarding of the residual node structure that would be otherwise be left orphaned after the transition.

    Засегнати продукти

    • Linux Linux: 36a580eb489f54d81a0534974962e732a314b999 преди 39005fd1ce654ffdecacddc406b9a038efe606e6; 36a580eb489f54d81a0534974962e732a314b999 преди bf49e6f6ddc12445a0330708b365de6458085980; 36a580eb489f54d81a0534974962e732a314b999 преди 4a1bb1f9f24a935c9b3f4fbf98012fa6d4ad826d; 36a580eb489f54d81a0534974962e732a314b999 преди b313edfbc0c2a60f7ce09b2e81ee71909ab8ddaf; 36a580eb489f54d81a0534974962e732a314b999 преди 5d3783c451a546373662ee11ec17019273e68034; 36a580eb489f54d81a0534974962e732a314b999 преди 448636c745a3f3b8582a0b8ce718c890a11c0fa9; 36a580eb489f54d81a0534974962e732a314b999 преди 28362e8ce51377afdec1782e661e808328a10514; 36a580eb489f54d81a0534974962e732a314b999 преди 45662dedb8f272ef7f16e69f13424c4bd0399240
    • Linux Linux: 2.6.30; преди 2.6.30; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 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-2026-89723: Linux | freedomonline.bg