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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-43376

ksmbd: fix use-after-free by using call_rcu() for oplock_info

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free by using call_rcu() for oplock_info ksmbd currently frees oplock_info immediately using kfree(), even though it is accessed under RCU read-side critical sections in places like opinfo_get() and proc_show_files(). Since there is no RCU grace period delay between nullifying the pointer and freeing the memory, a reader can still access oplock_info structure after it has been freed. This can leads to a use-after-free especially in opinfo_get() where atomic_inc_not_zero() is called on already freed memory. Fix this by switching to deferred freeing using call_rcu().

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

  • 296cb5457cc6f4a754c4ae29855f8a253d52bcc6 to < 302fef75512b2c8329a3f5efab1ae7ba2562387aaffected
  • d54ab1520d43e95f9b2e22d7a05fc9614192e5a5 to < 08aa9f3c8cf4d0bee44df540dfe34e8d64069f2caffected
  • 18b4fac5ef17f77fed9417d22210ceafd6525fc7 to < 1d6abf145615dbfe267ce3b0a271f95e3780e18eaffected
  • 18b4fac5ef17f77fed9417d22210ceafd6525fc7 to < ce8507ee82c888126d8e7565e27c016308d24cdeaffected
  • 18b4fac5ef17f77fed9417d22210ceafd6525fc7 to < 1dfd062caa165ec9d7ee0823087930f3ab8a6294affected
  • d73686367ad68534257cd88a36ca3c52cb8b81d8affected
  • 6.6.88 to < 6.6.130affected
  • 6.12.25 to < 6.12.78affected
  • 6.14.4 to < 6.15affected

Linux Linux

Default version status: affected

  • 6.15affected
  • 0 to < 6.15unaffected
  • 6.6.130 to ≤ 6.6.*unaffected
  • 6.12.78 to ≤ 6.12.*unaffected
  • 6.18.19 to ≤ 6.18.*unaffected
  • 6.19.9 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References