kernel: wrong headroom check in udp6_ufo_fragment()
Published May 17, 2012
7.1
HIGHCVSS 2.0
EPSS 3.18%
Description
The udp6_ufo_fragment function in net/ipv6/udp.c in the Linux kernel before 2.6.39, when a certain UDP Fragmentation Offload (UFO) configuration is enabled, allows remote attackers to cause a denial of service (system crash) by sending fragmented IPv6 UDP packets to a bridge device.
Affected products
No data.
Configuration 1
- < 2.6.39
Configuration 2
- ≥ 6.0.0 · ≤ 6.6.0
Running on/with
- n/a
No data.
Red Hat Enterprise Linux 6
kernel-0:2.6.32-131.21.1.el6
Fixed · RHSA-2011:1465
Red Hat Enterprise MRG 2
kernel-rt-0:2.6.33.9-rt31.79.el6rt
Fixed · RHSA-2012:0010
Red Hat Enterprise Linux 4
kernel
Not affected
Red Hat Enterprise Linux 5
kernel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | kernel-0:2.6.32-131.21.1.el6 | Fixed | RHSA-2011:1465 |
| Red Hat Enterprise MRG 2 | kernel-rt-0:2.6.33.9-rt31.79.el6rt | Fixed | RHSA-2012:0010 |
| Red Hat Enterprise Linux 4 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 4 and 5 as they did not provide support for UDP Fragmentation Offload (UFO) functionality. This has been addressed in Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-1465.html, and https://rhn.redhat.com/errata/RHSA-2012-0010.html.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:N/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 3.18% (0.03176) | 87.61th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.21% (0.03212) | 86.48th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.50% (0.01502) | 79.84th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.85% (0.00846) | 82.86th | v3 (v2023.03.01) |
| Jun 5, 2024 | 0.85% (0.00846) | 81.70th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.83% (0.00833) | 81.46th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.83% (0.00833) | 79.41th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.41% (0.01408) | 72.89th | v2 (v2022.01.01) |
| Feb 13, 2023 | 1.41% (0.01408) | 72.37th | v2 (v2022.01.01) |
| Feb 3, 2023 | 2.17% (0.02172) | 80.18th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.41% (0.01408) | 70.87th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.41% (0.01408) | 49.94th | v2 (v2022.01.01) |
References (11)
- http://downloads.avaya.com/css/P8/documents/100156038 x_refsource_CONFIRMThird Party Advisory
- http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39 x_refsource_CONFIRMBroken Link
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=a9cf73ea7ff78f52662c8658d93c226effbbedde x_refsource_CONFIRM
- http://www.openwall.com/lists/oss-security/2011/11/21/10 mailing-listx_refsource_MLISTMailing List
- http://www.securityfocus.com/bid/50751 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2011-4326 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=682066 x_refsource_CONFIRMExploitIssue TrackingThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=755584 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://github.com/torvalds/linux/commit/a9cf73ea7ff78f52662c8658d93c226effbbedde x_refsource_CONFIRMPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2011-4326
- https://www.cve.org/CVERecord?id=CVE-2011-4326
Change history (0)
No recorded changes yet.