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CVE-2026-43067: Linux, грешка в паметта

9.8

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 по мрежата, без особени условия, без вход и без действие от потребителя.

CVE радар: още уязвимости от този вид

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

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: ext4: handle wraparound when searching for blocks for indirect mapped blocks Commit 4865c768b563 ("ext4: always allocate blocks only from groups inode can use") restricts what blocks will be allocated for indirect block based files to block numbers that fit within 32-bit block numbers. However, when using a review bot running on the latest Gemini LLM to check this commit when backporting into an LTS based kernel, it raised this concern: If ac->ac_g_ex.fe_group is >= ngroups (for instance, if the goal group was populated via stream allocation from s_mb_last_groups), then start will be >= ngroups. Does this allow allocating blocks beyond the 32-bit limit for indirect block mapped files? The commit message mentions that ext4_mb_scan_groups_linear() takes care to not select unsupported groups. However, its loop uses group = *start, and the very first iteration will call ext4_mb_scan_group() with this unsupported group because next_linear_group() is only called at the end of the iteration. After reviewing the code paths involved and considering the LLM review, I determined that this can happen when there is a file system where some files/directories are extent-mapped and others are indirect-block mapped. To address this, add a safety clamp in ext4_mb_scan_groups().

Засегнати продукти

  • Linux Linux: 9d89b9d55e25cb340c5b4b769876edc551b7a9ff преди f89bba144938921a2249237ad04a0183ff3f8930; 1b0edd6022a3f44ce87fea9959a9310f4628fbea преди 83170a05908b6cf2fb3235d3065bf613ff866f3c; 9eea2f57d11b30049ff996ac3eff6e0dc8089e5f преди 4bec4a498ce86314d470ae6144120461f2138c29; 34c803edc0b3365a42efcf9815acab63b4cf54e0 преди 12624c5b724a81e14e532972b40d863b0de3b7d1; 321ed8d559c951e71ad2d2d69a4cf0445644e865 преди 2a368ccddfc492a0aa951e2caef2985f20e96503; 4865c768b563deff1b6a6384e74a62f143427b42 преди bb81702370fad22c06ca12b6e1648754dbc37e0f; 16fce6b6c0b247258c6c217fce5a48abf50f6964; 5.15.203 преди 5.16
  • Linux Linux: 6.1.167 преди 6.1.168; 6.6.130 преди 6.6.134; 6.12.77 преди 6.12.80; 6.18.14 преди 6.18.21; 6.19.4 преди 6.19.11

Вид слабост

История

  • 5 май 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-43067: Linux, грешка в паметта | freedomonline.bg