CVE-2011-1927

The ip_expire function in net/ipv4/ip_fragment.c in the Linux kernel before 2.6.39 does not properly construct ICMP_TIME_EXCEEDED packets after a timeout, which allows remote attackers to cause a denial of service (invalid pointer dereference) via crafted fragmented packets.

From the Ubuntu Security Team

Aristide Fattori and Roberto Paleari reported a flaw in the Linux kernel's handling of IPv4 icmp packets. A remote user could exploit this to cause a denial of service.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
linux	11.10 oneiric	Fixed 2.6.39-3.9
	11.04 natty	Fixed 2.6.38-10.44
	10.10 maverick	Fixed 2.6.35-32.66
	10.04 LTS lucid	Not affected
	8.04 LTS hardy	Not affected
linux-ec2	11.10 oneiric	Not in release
	11.04 natty	Not in release
	10.10 maverick	Ignored
	10.04 LTS lucid	Not affected
	8.04 LTS hardy	Not in release
linux-fsl-imx51	11.10 oneiric	Not in release
	11.04 natty	Not in release
	10.10 maverick	Not in release
	10.04 LTS lucid	Not affected
	8.04 LTS hardy	Not in release
linux-lts-backport-maverick	11.10 oneiric	Not in release
	11.04 natty	Not in release
	10.10 maverick	Not in release
	10.04 LTS lucid	Fixed 2.6.35-32.66~lucid1
	8.04 LTS hardy	Not in release
linux-lts-backport-natty	11.10 oneiric	Not in release
	11.04 natty	Not in release
	10.10 maverick	Not in release
	10.04 LTS lucid	Fixed 2.6.38-10.44~lucid1
	8.04 LTS hardy	Not in release
linux-lts-backport-oneiric	11.10 oneiric	Not in release
	11.04 natty	Not in release
	10.10 maverick	Not in release
	10.04 LTS lucid	Fixed 3.0.0-5.6~lucid1
	8.04 LTS hardy	Not in release
linux-mvl-dove	11.10 oneiric	Not in release
	11.04 natty	Not in release
	10.10 maverick	Not affected
	10.04 LTS lucid	Not affected
	8.04 LTS hardy	Not in release
linux-ti-omap4	11.10 oneiric	Fixed 3.0.0-1200.1
	11.04 natty	Fixed 2.6.38-1209.22
	10.10 maverick	Fixed 2.6.35-903.31
	10.04 LTS lucid	Not in release
	8.04 LTS hardy	Not in release

Notes

jdstrand

2.6.38 only?

apw

this report and the fix overlapped with each other commit below was identified as the fix: 64f3b9e203bd06855072e295557dca1485a2ecba

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
linux	Introduced by 4a94445, fixed by 64f3b9e

References

Related Ubuntu Security Notices (USN)

USN-1379-1
Linux kernel vulnerabilities
28 February 2012

USN-1387-1
Linux kernel (Maverick backport) vulnerabilities
6 March 2012

USN-1383-1
Linux kernel (OMAP4) vulnerabilities
6 March 2012

USN-1167-1
Linux kernel vulnerabilities
13 July 2011