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CVE-2026-53249· NVD / CVE Program· CNA Linux

ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 00e8845fe3428c69e980dce5071cb3da1d8f7578, 28f5ad1b4055405eb1616e603fe511ba5e3725e7, 2a87c3e8f03ce655ed0ef500d64d5fd924ec3691; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.

Low priority for now. Upgrade to Linux Linux 00e8845fe3428c69e980dce5071cb3da1d8f7578, 28f5ad1b4055405eb1616e603fe511ba5e3725e7, 2a87c3e8f03ce655ed0ef500d64d5fd924ec3691; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jun 25, 2026
Updated
Oct 15, 2026
EPSS
0.1% · 2th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel2.6.12.1 and later · before 5.10.259
  • linux linux kernel5.11 and later · before 5.15.210
  • linux linux kernel5.16 and later · before 6.1.176
  • linux linux kernel6.2 and later · before 6.6.143
  • linux linux kernel6.7 and later · before 6.12.94
  • linux linux kernel6.13 and later · before 6.18.36
  • linux linux kernel6.19 and later · before 7.0.13
  • linux linux kernel2.6.12
  • linux linux kernel7.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.12affected
    • 7.1 and laternot affected · original_commit_for_fix
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 2a87c3e8f03ce655ed0ef500d64d5fd924ec3691affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 89343ff12b3178fc236fe531a3603e7c97c68278affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 8ff85dbabbbfb05e86e6cde31d91ac5782179d4daffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 00e8845fe3428c69e980dce5071cb3da1d8f7578affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before a4f3fd6516920988c47ba8d19714985c40c816a1affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 28f5ad1b4055405eb1616e603fe511ba5e3725e7affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7caffected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.13-17.0.13-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-53245Jun 25, 2026 · net/802/mrp: fix vector attribute parsing in mrp_pdu_parse_vecattr
    22Monitor
  • ← EarlierCVE-2026-53246Jun 25, 2026 · sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
    39Monitor
  • Later →CVE-2026-53250Jun 25, 2026 · xsk: cache csum_start/csum_offset to fix TOCTOU in xsk_skb_metadata()
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux00e8845fe3428c69e980dce5071cb3da1d8f7578Vendor (CNA)
Linux Linux28f5ad1b4055405eb1616e603fe511ba5e3725e7Vendor (CNA)
Linux Linux2a87c3e8f03ce655ed0ef500d64d5fd924ec3691Vendor (CNA)
Linux Linux4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2Vendor (CNA)
Linux Linux89343ff12b3178fc236fe531a3603e7c97c68278Vendor (CNA)
Linux Linux8ff85dbabbbfb05e86e6cde31d91ac5782179d4dVendor (CNA)
Linux Linuxa4f3fd6516920988c47ba8d19714985c40c816a1Vendor (CNA)
Linux Linuxd3915a1f5a4bc0ac911032903c3c6ab8df9fcc7cVendor (CNA)
azl3 kernel 6.6.141.1-1 on Azure Linux 3.06.6.143.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records