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CVE-2026-80536: Linux

8.4

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, без вход и без действие от потребителя.

  • Експлоатация: няма данни за експлоатация
  • Атаката не може да се автоматизира

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: xfs: bounds-check buffer log item's dirty bitmap xlog_recover_do_reg_buffer() replays each dirty region described by a buffer log item's bitmap into the buffer read for that item: memcpy(xfs_buf_offset(bp, (uint)bit << XFS_BLF_SHIFT), item->ri_buf[i].iov_base, nbits << XFS_BLF_SHIFT); The destination offset (bit/nbits, from the logged dirty bitmap) and the buffer size (from the logged blf_len) are both attacker-controlled and otherwise unrelated, yet the only thing bounding the copy is an ASSERT(), which compiles away on production kernels. A crafted image logging a small blf_len together with a bitmap bit past the end of that buffer drives the memcpy() past the buffer's allocation, corrupting adjacent kernel heap during mount-time log recovery. This is reachable by anyone who can get a crafted image mounted -- the malicious-filesystem threat model XFS already guards against elsewhere. Turn the ASSERT() into a real XFS_IS_CORRUPT() check that aborts recovery of the buffer with -EFSCORRUPTED, consistent with the validate-and-fail idiom already used in xlog_recover_do_inode_buffer() and xfs_dquot_item_recover.c. xlog_recover_do_reg_buffer() therefore becomes STATIC int and its three callers propagate the error. Found and confirmed with KASAN on a CONFIG_XFS_DEBUG=n build: the crafted image trips a slab-out-of-bounds write before this change and fails recovery cleanly with -EFSCORRUPTED after it.

Засегнати продукти

  • Linux Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди acb4e26295e7f0e685815a3fd3d70bd8329cefa1; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди f3859c35a4fbc1c1c58431f684f808e43696891d; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди f7b5fa83e2c192be922121b764415fa8c7549ea1; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди b7528b42813f02724a78fce1da24d69d1bfc4d38; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 7e32d4eebae6ca24f8a673c107fd7eca1f47afc2; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди f8288214459ead7e87d26e5822f62c14a4f2ed6b; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди edaf5b6bd625356893da20d69a259b34a9de2694; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 813f8136a2ce1fee266d02a7df73db6e8a541604
  • Linux Linux: 2.6.12; преди 2.6.12; 5.10.267 до 5.10.*; 5.15.218 до 5.15.*; 6.1.185 до 6.1.*; 6.6.154 до 6.6.*; 6.12.106 до 6.12.*; 6.18.46 до 6.18.*; 7.1.10 до 7.1.*; от 7.2 нататък

История

  • 26 август 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-80536: Linux | freedomonline.bg