Bug 1250030 (CVE-2015-5707) - CVE-2015-5707 kernel: number wraparound vulnerability in function start_req()
Summary: CVE-2015-5707 kernel: number wraparound vulnerability in function start_req()
Alias: CVE-2015-5707
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1250034 1293521
Blocks: 1250036
TreeView+ depends on / blocked
Reported: 2015-08-04 11:45 UTC by Adam Mariš
Modified: 2021-10-21 00:47 UTC (History)
25 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
An integer-overflow vulnerability was found in the scsi block-request handling code in function start_req(). A local attacker could use specially crafted IOV requests to overflow a counter used in bio_map_user_iov()'s page calculation, and write past the end of the array that contains kernel-page pointers.
Clone Of:
Last Closed: 2021-10-21 00:47:25 UTC

Attachments (Terms of Use)

Description Adam Mariš 2015-08-04 11:45:20 UTC
This bug, which was probably introduced in Linux 2.6.28, was assigned CVE.
In drivers/scsi/sg.c in function start_req(), there was code segment vulnerable to number wraparound in the calculation of total number of pages in bio_map_user_iov().
This can result to allocating small array of pointers to pages that would be overflowed. It was fixed in Linux 4.1-rc1.

CVE assignment:

Upstream patches:

Comment 1 Adam Mariš 2015-08-04 11:55:22 UTC
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1250034]

Comment 2 Wade Mealing 2015-12-22 01:27:17 UTC

This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 6, 7 MRG-2 and realtime kernels and does not plan be addressed in a future update.

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