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CVE-2026-64496: Linux, състезание за ресурс

7.1

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.

CVE радар: още уязвимости от този вид

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

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: iio: event: Fix event FIFO reset race `iio_event_getfd()` creates the event file descriptor with `anon_inode_getfd()`, which allocates a new fd, creates the anonymous file and installs it in the process fd table before returning to the caller. The IIO code resets the event FIFO after `anon_inode_getfd()` has returned, but before `IIO_GET_EVENT_FD_IOCTL` has copied the fd number to userspace. But since fd tables are shared between threads, another thread can guess the newly allocated fd number and issue a `read()` on it as soon as the fd has been installed. This means the `kfifo_to_user()` in `iio_event_chrdev_read()` can run in parallel with the `kfifo_reset_out()` in `iio_event_getfd()`. The kfifo documentation says that `kfifo_reset_out()` is only safe when it is called from the reader thread and there is only one concurrent reader. Otherwise it is dangerous and must be handled in the same way as `kfifo_reset()`. If that happens, `kfifo_to_user()` can advance the FIFO `out` index based on state from before the reset, after the reset has already moved the `out` index to the current `in` index. That can leave the FIFO with an `out` index past the `in` index. A later `read()` can then see an underflowed FIFO length and copy more data than the event FIFO buffer contains. This can result in an out-of-bounds read and leak adjacent kernel memory to userspace. Move the FIFO reset before `anon_inode_getfd()`. At that point the event fd is marked busy, but the new fd has not been installed yet, so userspace cannot access it while the FIFO is reset.

Засегнати продукти

  • Linux Linux: b91accafbb1031b80d22ad83576877ff2f8b4774 преди 9dc84ba4be5bbeb29ee49efe6cea2cb32c461424; b91accafbb1031b80d22ad83576877ff2f8b4774 преди d16a702ca7d29c0b7a9b509339d1b044a1cadb32; b91accafbb1031b80d22ad83576877ff2f8b4774 преди a13ef1adbc62085b21b546b07b0be7e2fbf52150; b91accafbb1031b80d22ad83576877ff2f8b4774 преди 0d4a646d7f87ea3625fafe387043fddc6a2f5e7f; b91accafbb1031b80d22ad83576877ff2f8b4774 преди 72c6aa8e0d74eab91b8694cde97dec088c248fee; b91accafbb1031b80d22ad83576877ff2f8b4774 преди 9edefd4c56bee3fe331e0355d1f10a533134999d; b91accafbb1031b80d22ad83576877ff2f8b4774 преди f187dc5a4c4846ffa07d9bda6e760837ed005574; b91accafbb1031b80d22ad83576877ff2f8b4774 преди af791d295737ea6b6ff2c8d8488462a49c14af01
  • Linux Linux: 3.15; преди 3.15; 5.10.261 до 5.10.*; 5.15.212 до 5.15.*; 6.1.178 до 6.1.*; 6.6.145 до 6.6.*; 6.12.96 до 6.12.*; 6.18.39 до 6.18.*; 7.1.4 до 7.1.*; от 7.2 нататък

Вид слабост

История

  • 25 юли 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-64496: Linux, състезание за ресурс | freedomonline.bg