5.5
MEDIUM
CVSS 3.1
CVE-2026-53249
ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options
Overview
Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options This patch restricts setting Loose Source and Record Route (LSRR) and Strict Source and Record Route (SSRR) IP options to users with CAP_NET_RAW capability. This prevents unprivileged applications from forcing packets to route through attacker-controlled nodes to leak TCP ISN and possibly other protocol information. While LSRR and SSRR are commonly filtered in many network environments, they may still be supported and forwarded along some network paths. RFC 7126 (Recommendations on Filtering of IPv4 Packets Containing IPv4 Options) recommend to drop these options in 4.3 and 4.4.
Details
INFO
Published Date :
June 25, 2026, 9:16 a.m.
Last Modified :
Sept. 8, 2026, 9:18 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
Restrict IP options by assigning CAP_NET_RAW capability.
- Assign CAP_NET_RAW capability to restrict IP options.
- Update the Linux kernel to the latest version.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53249.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53249 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53249
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53249 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53249 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 08, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578 Added Reference https://git.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7 Added Reference https://git.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691 Added Reference https://git.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2 Added Reference https://git.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278 Added Reference https://git.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4d Added Reference https://git.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1 Added Reference https://git.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c Removed Reference https://git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578 Removed Reference https://git.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7 Removed Reference https://git.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691 Removed Reference https://git.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2 Removed Reference https://git.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278 Removed Reference https://git.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4d Removed Reference https://git.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1 Removed Reference https://git.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c Removed Reference Type https://git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578 Types: Patch Removed Reference Type https://git.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7 Types: Patch Removed Reference Type https://git.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691 Types: Patch Removed Reference Type https://git.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2 Types: Patch Removed Reference Type https://git.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278 Types: Patch Removed Reference Type https://git.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4d Types: Patch Removed Reference Type https://git.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1 Types: Patch Removed Reference Type https://git.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c Types: Patch -
CVE Modified by 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Sep. 08, 2026
Action Type Old Value New Value Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/53xxx/CVE-2026-53249.json">CVE-2026-53249</a> Added Reference https://cert-portal.siemens.com/productcert/html/ssa-019113.html -
Initial Analysis by [email protected]
Jul. 07, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.176 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.143 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.210 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.36 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.94 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.13 *cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.12.1 up to (excluding) 5.10.259 Added Reference Type kernel.org: https://git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c Types: Patch -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '2a87c3e8f03ce655ed0ef500d64d5fd924ec3691', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '89343ff12b3178fc236fe531a3603e7c97c68278', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '8ff85dbabbbfb05e86e6cde31d91ac5782179d4d', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '00e8845fe3428c69e980dce5071cb3da1d8f7578', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': 'a4f3fd6516920988c47ba8d19714985c40c816a1', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '28f5ad1b4055405eb1616e603fe511ba5e3725e7', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': 'd3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c', 'versionType': 'git'}], 'programFiles': ['net/ipv4/ip_options.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.12'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.12', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.259', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.210', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.94', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.36', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.13', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv4/ip_options.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options This patch restricts setting Loose Source and Record Route (LSRR) and Strict Source and Record Route (SSRR) IP options to users with CAP_NET_RAW capability. This prevents unprivileged applications from forcing packets to route through attacker-controlled nodes to leak TCP ISN and possibly other protocol information. While LSRR and SSRR are commonly filtered in many network environments, they may still be supported and forwarded along some network paths. RFC 7126 (Recommendations on Filtering of IPv4 Packets Containing IPv4 Options) recommend to drop these options in 4.3 and 4.4. Added Reference https://git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578 Added Reference https://git.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7 Added Reference https://git.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691 Added Reference https://git.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2 Added Reference https://git.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278 Added Reference https://git.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4d Added Reference https://git.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1 Added Reference https://git.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.