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Alpine Linux: CVE-2021-3782: Integer Overflow or Wraparound

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Alpine Linux: CVE-2021-3782: Integer Overflow or Wraparound

Severity
10
CVSS
(AV:N/AC:L/Au:N/C:C/I:C/A:C)
Published
09/23/2022
Created
03/22/2024
Added
03/21/2024
Modified
03/22/2024

Description

An internal reference count is held on the buffer pool, incremented every time a new buffer is created from the pool. The reference count is maintained as an int; on LP64 systems this can cause the reference count to overflow if the client creates a large number of wl_shm buffer objects, or if it can coerce the server to create a large number of external references to the buffer storage. With the reference count overflowing, a use-after-free can be constructed on the wl_shm_pool tracking structure, where values may be incremented or decremented; it may also be possible to construct a limited oracle to leak 4 bytes of server-side memory to the attacking client at a time.

Solution(s)

  • alpine-linux-upgrade-wayland

References

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