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CVE-2026-89707: Linux

7.5

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.

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

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: nfsd: release path refs on follow_down() error nfsd_cross_mnt() initializes a local struct path with mntget() and dget() before calling follow_down(). On a negative return the error arm jumps to out without releasing those references: err = follow_down(&path, follow_flags); if (err < 0) goto out; follow_down() never drops the caller's entry-time refs on any error sub-case; for example a pre-cross d_manage() failure leaves path untouched, so the mntget()/dget() taken on entry survive the call. Every other early-exit arm in nfsd_cross_mnt() (other-namespace return, IS_ERR(exp2), and the success tail after the swap) already calls path_put(&path); the err < 0 arm is the lone omission. The leak inflates mnt_count and d_count on each failed cross-mount, blocking umount and pinning dentries against the shrinker, and is reachable by any authenticated NFS client through nfsd_lookup_dentry or the NFSv4 READDIR encode path. Fix by calling path_put(&path) before the goto out in the err < 0 arm so the entry-time refs are released on all follow_down() error returns.

Засегнати продукти

  • Linux Linux: cc53ce53c86924bfe98a12ea20b7465038a08792 преди bdf5a0f88d21239d8f9f7519b87359ba95fd045c; cc53ce53c86924bfe98a12ea20b7465038a08792 преди 18847cbf5900f5c6c55bef5a6f7a34a1918d1181; cc53ce53c86924bfe98a12ea20b7465038a08792 преди e301c5cdb0dc2c4aeffc0c055ea15615d9c51fdc; cc53ce53c86924bfe98a12ea20b7465038a08792 преди 085cfde7c2186acaad103f02d2c25435ad5224e9; cc53ce53c86924bfe98a12ea20b7465038a08792 преди 194316df81263519156ebe714c4a286bee00e5be; cc53ce53c86924bfe98a12ea20b7465038a08792 преди 467d56fd3ff57447a790c6dc3ede2d02a947d224; cc53ce53c86924bfe98a12ea20b7465038a08792 преди 2bc4343308d85ee4e0dd3877b384306c96f114c2; cc53ce53c86924bfe98a12ea20b7465038a08792 преди 6cba08dc1922140d260cfeb30bbda4ee1bf869d8
  • Linux Linux: 2.6.38; преди 2.6.38; 5.10.273 до 5.10.*; 5.15.224 до 5.15.*; 6.1.191 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-2026-89707: Linux | freedomonline.bg