National Cyber-Alert System
Vulnerability Summary for CVE-2009-3043
Original release date:09/02/2009
Last revised:09/24/2009
Source:
US-CERT/NIST
Overview
The tty_ldisc_hangup function in drivers/char/tty_ldisc.c in the Linux kernel 2.6.31-rc before 2.6.31-rc8 allows local users to cause a denial of service (system crash, sometimes preceded by a NULL pointer dereference) or possibly gain privileges via certain pseudo-terminal I/O activity, as demonstrated by KernelTtyTest.c.
Impact
CVSS Severity (version 2.0):
Impact Subscore:
6.9
Exploitability Subscore:
3.9
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type:Allows disruption of serviceUnknown
Official Statement from Red Hat (09/03/2009)
Not vulnerable. This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 3, 4, 5 or Red Hat Enterprise MRG, as they do not contain a backport of the tty ldisc rewrite (upstream commits 65b770468e98 and cbe9352fa08f).
References to Advisories, Solutions, and Tools
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External Source: BID
Name: 36191
Type: Patch Information
External Source: MLIST
Name: [oss-security] 20090904 Re: CVE request: kernel: tty: make sure to flush any pending work when halting the ldisc
External Source: MLIST
Name: [oss-security] 20090903 Re: CVE request: kernel: tty: make sure to flush any pending work when halting the ldisc
External Source: MLIST
Name: [oss-security] 20090831 CVE request: kernel: tty: make sure to flush any pending work when halting the ldisc
External Source: CONFIRM
Name: http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.31-rc8
External Source: MLIST
Name: [linux-kernel] 20090820 Re: v2.6.31-rc6: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
External Source: MLIST
Name: [linux-kernel] 20090819 Re: v2.6.31-rc6: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
External Source: MLIST
Name: [linux-kernel] 20090819 v2.6.31-rc6: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
External Source: CONFIRM
Name: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5c58ceff103d8a654f24769bb1baaf84a841b0cc
