Linux Kernel Netfilter: Reject oversized rt addrnr in ip6t_rt match rule
CVE-2026-31674 Published on April 25, 2026
netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()
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.
Products Associated with CVE-2026-31674
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 13e3e30ed3b5b67cc1db2bd58a5d09b0f07debfa is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below af9b7e2b765966457f4ec23be5bd34a141f89574 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 29ea965a1353bc8303877422f79c8211e9ba9c55 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below c6a503a9f4debc654e3a6a7ca1f7fce6a9953c59 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below ded71f5684df16fa645cca5bf4fe6b0cd8a46119 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below d8795fde1f78669a87c87ac29fceab2f104daa8c is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below a28ebf6f99de270d6338ccdc3b49f3e818f99b7b is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 9d3f027327c2fa265f7f85ead41294792c3296ed is affected.
- Version 2.6.12 is affected.
- Before 2.6.12 is unaffected.
- Version 5.10.253, <= 5.10.* is unaffected.
- Version 5.15.203, <= 5.15.* is unaffected.
- Version 6.1.168, <= 6.1.* is unaffected.
- Version 6.6.131, <= 6.6.* is unaffected.
- Version 6.12.80, <= 6.12.* is unaffected.
- Version 6.18.21, <= 6.18.* is unaffected.
- Version 6.19.11, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.