High severity · published Apr 25, 2026
CVE-2026-31674
netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()
7.1
CVSS
0.2%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()
Reject rt match rules whose addrnr exceeds IP6T_RT_HOPS.
rt_mt6() expects addrnr to stay within the bounds of rtinfo->addrs[].
Validate addrnr during rule installation so malformed rules are rejected
before the match logic can use an out-of-range value.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
2.6.12.1 before 5.10.253; 5.11 before 5.15.203; 5.16 before 6.1.168; 6.2 before 6.6.131; 6.7 before 6.12.80; 6.13 before 6.18.21; +11 more · source: NVD
LI
Linux · Linux
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 13e3e30ed3b5b67cc1db2bd58a5d09b0f07debfa; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before af9b7e2b765966457f4ec23be5bd34a141f89574; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 29ea965a1353bc8303877422f79c8211e9ba9c55; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before c6a503a9f4debc654e3a6a7ca1f7fce6a9953c59; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ded71f5684df16fa645cca5bf4fe6b0cd8a46119; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before d8795fde1f78669a87c87ac29fceab2f104daa8c; +3 more · source: vendor
SS
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.5; V3.1.7; V3.1.6; V3.1.5; V3.1.7 · source: CISA
SS
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP · Siemens
V3.1.6; V3.1.5; V3.1.7; V3.1.6; V3.1.5; V3.1.7 · source: CISA
SS
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP · Siemens
V3.1.6; V3.1.5; V3.1.7 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-31674
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-31674
Patch
https://git.kernel.org/stable/c/13e3e30ed3b5b67cc1db2bd58a5d09b0f07debfa
Patch
https://git.kernel.org/stable/c/29ea965a1353bc8303877422f79c8211e9ba9c55
Patch
https://git.kernel.org/stable/c/9d3f027327c2fa265f7f85ead41294792c3296ed
Patch
https://git.kernel.org/stable/c/a28ebf6f99de270d6338ccdc3b49f3e818f99b7b
Patch
https://git.kernel.org/stable/c/af9b7e2b765966457f4ec23be5bd34a141f89574
Patch
https://git.kernel.org/stable/c/c6a503a9f4debc654e3a6a7ca1f7fce6a9953c59
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