kernel: emergency route cache flushing leads to node deadlock
Published Jan 27, 2010
7.5
HIGHCVSS 3.1
EPSS 11.05%
Description
A certain Red Hat patch for net/ipv4/route.c in the Linux kernel 2.6.18 on Red Hat Enterprise Linux (RHEL) 5 allows remote attackers to cause a denial of service (deadlock) via crafted packets that force collisions in the IPv4 routing hash table, and trigger a routing "emergency" in which a hash chain is too long. NOTE: this is related to an issue in the Linux kernel before 2.6.31, when the kernel routing cache is disabled, involving an uninitialized pointer and a panic.
Affected products
No data.
Configuration 1
- 2.6.18
Running on/with
- 5.0
Configuration 2
- 5.0
- 5.0
- 5.4
- 5.0
- 5.0
No data.
Red Hat Enterprise Linux 5
kernel-0:2.6.18-164.11.1.el5
Fixed · RHSA-2010:0046
Red Hat Enterprise Virtualization for RHEL-5
rhev-hypervisor-0:5.4-2.1.8.el5_4rhev2_1
Fixed · RHSA-2010:0095
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel-0:2.6.18-164.11.1.el5 | Fixed | RHSA-2010:0046 |
| Red Hat Enterprise Virtualization for RHEL-5 | rhev-hypervisor-0:5.4-2.1.8.el5_4rhev2_1 | Fixed | RHSA-2010:0095 |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 3, 4 and Red Hat Enterprise MRG. Shipped kernels do not include upstream commits c6153b5b and 1080d709 that introduced the problem.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/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 2, 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 2, 2026 | 11.05% (0.11051) | 95.79th | v5 (v2026.06.15) |
| Jun 15, 2026 | 11.05% (0.11051) | 95.33th | v5 (v2026.06.15) |
| Mar 17, 2025 | 2.05% (0.02052) | 82.67th | v4 (v2025.03.14) |
| Dec 12, 2024 | 2.77% (0.02765) | 90.96th | v3 (v2023.03.01) |
| Feb 16, 2024 | 2.77% (0.02765) | 90.25th | v3 (v2023.03.01) |
| Jan 30, 2024 | 9.12% (0.09115) | 94.08th | v3 (v2023.03.01) |
| Mar 7, 2023 | 6.65% (0.06649) | 92.66th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.17% (0.02172) | 80.77th | v2 (v2022.01.01) |
| Feb 13, 2023 | 2.17% (0.02172) | 80.28th | v2 (v2022.01.01) |
| Feb 3, 2023 | 3.78% (0.03779) | 85.12th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.17% (0.02172) | 78.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.17% (0.02172) | 57.73th | v2 (v2022.01.01) |
References (15)
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=73e42897e8e5619eacb787d2ce69be12f47cfc21 x_refsource_CONFIRMBroken Link
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=b6280b47a7a42970d098a3059f4ebe7e55e90d8d x_refsource_CONFIRMBroken Link
- http://support.avaya.com/css/P8/documents/100073666 x_refsource_CONFIRMThird Party Advisory
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.31 x_refsource_CONFIRMBroken Link
- http://www.openwall.com/lists/oss-security/2010/01/20/1 mailing-listx_refsource_MLISTMailing List
- http://www.openwall.com/lists/oss-security/2010/01/20/6 mailing-listx_refsource_MLISTMailing List
- https://access.redhat.com/security/cve/CVE-2009-4272 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=545411 x_refsource_CONFIRMExploitIssue Tracking
- https://exchange.xforce.ibmcloud.com/vulnerabilities/55808 vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry
- https://nvd.nist.gov/vuln/detail/CVE-2009-4272
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11167 vdb-entrysignaturex_refsource_OVALBroken Link
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7026 vdb-entrysignaturex_refsource_OVALBroken Link
- https://rhn.redhat.com/errata/RHSA-2010-0046.html vendor-advisoryx_refsource_REDHATVendor Advisory
- https://rhn.redhat.com/errata/RHSA-2010-0095.html vendor-advisoryx_refsource_REDHATVendor Advisory
- https://www.cve.org/CVERecord?id=CVE-2009-4272
Change history (0)
No recorded changes yet.