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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-53025

greybus: raw: fix use-after-free on cdev close

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: greybus: raw: fix use-after-free on cdev close This addresses a use-after-free bug when a raw bundle is disconnected but its chardev is still opened by an application. When the application releases the cdev, it causes the following panic when init on free is enabled (CONFIG_INIT_ON_FREE_DEFAULT_ON=y): refcount_t: underflow; use-after-free. WARNING: CPU: 0 PID: 139 at lib/refcount.c:28 refcount_warn_saturate+0xd0/0x130 ... Call Trace: <TASK> cdev_put+0x18/0x30 __fput+0x255/0x2a0 __x64_sys_close+0x3d/0x80 do_syscall_64+0xa4/0x290 entry_SYSCALL_64_after_hwframe+0x77/0x7f The cdev is contained in the "gb_raw" structure, which is freed in the disconnect operation. When the cdev is released at a later time, cdev_put gets an address that points to freed memory. To fix this use-after-free, convert the struct device from a pointer to being embedded, that makes the lifetime of the cdev and of this device the same. Then, use cdev_device_add, which guarantees that the device won't be released until all references to the cdev have been released. Finally, delegate the freeing of the structure to the device release function, instead of freeing immediately in the disconnect callback.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • e806c7fb8e9bae87fc23958c3789f2c2f96f54a4 to < 0597908256173da5256ef8e6db17ccc8d5c40ee3affected
  • e806c7fb8e9bae87fc23958c3789f2c2f96f54a4 to < e4d07fd4e30024a4a15094ef2c404197667c857eaffected
  • e806c7fb8e9bae87fc23958c3789f2c2f96f54a4 to < 3abf97a03f4abce1dc3639eea2fcd4bd747b3308affected
  • e806c7fb8e9bae87fc23958c3789f2c2f96f54a4 to < e72ffe59e48a74a8d9220f5ca1d03f2194d882f0affected
  • e806c7fb8e9bae87fc23958c3789f2c2f96f54a4 to < ef2d97c15b19b3489de01695bce478601e236c3eaffected
  • e806c7fb8e9bae87fc23958c3789f2c2f96f54a4 to < 983cc2c7efbce04ecbf6328448d895044dd6ab31affected

Linux Linux

Default version status: affected

  • 4.9affected
  • 0 to < 4.9unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.114 to ≤ 6.12.*unaffected
  • 6.18.57 to ≤ 6.18.*unaffected
  • 7.0.10 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References