Medium severity5.5NVD Advisory· Published Jun 25, 2026· Updated Sep 8, 2026
CVE-2026-53249
CVE-2026-53249
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
34- osv-coords21 versionspkg:rpm/opensuse/kernel-docs&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-64kb&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-syms&distro=openSUSE%20Leap%2016.0pkg:apk/chainguard/linux-vmware-6.18pkg:rpm/opensuse/kernel-kvmsmall&distro=openSUSE%20Leap%2016.0pkg:apk/chainguard/linux-qemu-melangepkg:rpm/opensuse/kernel-obs-qa&distro=openSUSE%20Leap%2016.0pkg:apk/chainguard/linux-gcp-6.18pkg:rpm/opensuse/kernel-azure&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/dtb-aarch64&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-obs-build&distro=openSUSE%20Leap%2016.0pkg:apk/chainguard/linux-azure-6.18pkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Leap%2016.0pkg:apk/chainguard/linux-gcp-6.18-bootc-boot-installedpkg:apk/chainguard/linux-qemu-6.18-bootc-boot-installedpkg:linux/kernelpkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-zfcpdump&distro=openSUSE%20Leap%2016.0pkg:apk/chainguard/linux-qemu-6.18pkg:rpm/opensuse/kernel-rt&distro=openSUSE%20Leap%2016.0
< 6.12.0-160000.36.1+ 20 more
- (no CPE)range: < 6.12.0-160000.36.1
- (no CPE)range: < 6.12.0-160000.36.1
- (no CPE)range: < 6.12.0-160000.36.1
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.12.0-160000.36.1
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.12.0-160000.36.1
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.12.0-160000.36.1
- (no CPE)range: < 6.12.0-160000.36.1
- (no CPE)range: < 6.12.0-160000.36.1
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.12.0-160000.36.1
- (no CPE)range: < 6.12.0-160000.36.1
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: >= 2.6.12, < 5.10.259
- (no CPE)range: < 6.12.0-160000.36.1.160000.2.17
- (no CPE)range: < 6.12.0-160000.36.1
- (no CPE)range: < 6.18.38-r0
- (no CPE)range: < 6.12.0-160000.36.1
(expand)+ 12 more
- (no CPE)
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=2.6.12.1,<5.10.259
- cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:*
- 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:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:*
- 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:7.1:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
9- git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578nvdPatch
- git.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7nvdPatch
- git.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691nvdPatch
- git.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2nvdPatch
- git.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278nvdPatch
- git.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4dnvdPatch
- git.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1nvdPatch
- git.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7cnvdPatch
- cert-portal.siemens.com/productcert/html/ssa-019113.htmlnvd
News mentions
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