There are 2 CVE entries that match your search.
||Integer overflow in ext/shmop/shmop.c in PHP before 5.3.6 allows
context-dependent attackers to cause a denial of service (crash) and
possibly read sensitive memory via a large third argument to the
||The shmop functions in PHP before 4.4.5, and before 5.2.1 in the 5.x
series, do not verify that their arguments correspond to a shmop
resource, which allows context-dependent attackers to read and write
arbitrary memory locations via arguments associated with an
inappropriate resource, as demonstrated by a GD Image resource.