kernel: net: divide by zero in tcp algorithm illinois
Published Dec 21, 2012
4.7
MEDIUMCVSS 2.0
EPSS 0.49%
Description
The tcp_illinois_info function in net/ipv4/tcp_illinois.c in the Linux kernel before 3.4.19, when the net.ipv4.tcp_congestion_control illinois setting is enabled, allows local users to cause a denial of service (divide-by-zero error and OOPS) by reading TCP stats.
Affected products
No data.
- ≤ 3.4.18
- 3.4.1
- 3.4.2
- 3.4.3
- 3.4.4
- 3.4.5
- 3.4.6
- 3.4.7
- 3.4.8
- 3.4.9
- 3.4.10
- 3.4.11
- 3.4.12
- 3.4.13
- 3.4.14
- 3.4.15
- 3.4.16
- 3.4.17
No data.
Red Hat Enterprise Linux 6
kernel-0:2.6.32-279.19.1.el6
Fixed · RHSA-2012:1580
Red Hat Enterprise MRG 2
kernel-rt-0:3.2.33-rt50.66.el6rt
Fixed · RHSA-2012:1491
Red Hat Enterprise Linux 5
kernel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | kernel-0:2.6.32-279.19.1.el6 | Fixed | RHSA-2012:1580 |
| Red Hat Enterprise MRG 2 | kernel-rt-0:3.2.33-rt50.66.el6rt | Fixed | RHSA-2012:1491 |
| 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 version of Linux kernel as shipped with Red Hat Enterprise Linux 5. This issue did affect the version of Linux kernel as shipped with Red Hat Enterprise Linux 6. This issue did affect the version of Linux kernel as shipped with Red Hat Enterprise MRG 2.
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:L/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 1, 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 (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.49% (0.00486) | 39.61th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.49% (0.00486) | 37.85th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.04% (0.00043) | 10.09th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00044) | 11.89th | v3 (v2023.03.01) |
| Jul 2, 2024 | 0.04% (0.00044) | 10.25th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00044) | 8.24th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.55% (0.01547) | 74.98th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.55% (0.01547) | 74.94th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.55% (0.01547) | 72.92th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.55% (0.01547) | 51.82th | v2 (v2022.01.01) |
References (21)
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=8f363b77ee4fbf7c3bbcf5ec2c5ca482d396d664 x_refsource_CONFIRM
- http://lists.fedoraproject.org/pipermail/package-announce/2012-November/091110.html vendor-advisoryx_refsource_FEDORA
- http://rhn.redhat.com/errata/RHSA-2012-1580.html vendor-advisoryx_refsource_REDHAT
- http://secunia.com/advisories/51409 third-party-advisoryx_refsource_SECUNIA
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.4.19 x_refsource_CONFIRM
- http://www.openwall.com/lists/oss-security/2012/10/31/5 mailing-listx_refsource_MLIST
- http://www.securityfocus.com/bid/56346 vdb-entryx_refsource_BID
- http://www.ubuntu.com/usn/USN-1644-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-1645-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-1646-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-1647-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-1648-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-1649-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-1650-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-1651-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/USN-1652-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2012-4565 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=871848 x_refsource_CONFIRMIssue Tracking
- https://github.com/torvalds/linux/commit/8f363b77ee4fbf7c3bbcf5ec2c5ca482d396d664 x_refsource_CONFIRMExploit
- https://nvd.nist.gov/vuln/detail/CVE-2012-4565
- https://www.cve.org/CVERecord?id=CVE-2012-4565
Change history (0)
No recorded changes yet.