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CVE-2024-26831
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MITRE ATT&CK
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Privilege Escalation
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Description
In the Linux kernel, the following vulnerability has been resolved:
net/handshake: Fix handshake_req_destroy_test1
Recently, handshake_req_destroy_test1 started failing:
Expected handshake_req_destroy_test == req, but
handshake_req_destroy_test == 0000000000000000 req == 0000000060f99b40
not ok 11 req_destroy works
This is because “sock_release(sock)” was replaced with “fput(filp)”
to address a memory leak. Note that sock_release() is synchronous
but fput() usually delays the final close and clean-up.
The delay is not consequential in the other cases that were changed
but handshake_req_destroy_test1 is testing that handshake_req_cancel()
followed by closing the file actually does call the –>hp_destroy
method. Thus the PTR_EQ test at the end has to be sure that the
final close is complete before it checks the pointer.
We cannot use a completion here because if –>hp_destroy is never
called (ie, there is an API bug) then the test will hang.
Reported by: Guenter Roeck linux@roeck-us.net
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