CVE-2026-74581

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: clear suppressed fib6 rule result fib6_rule_suppress() drops a suppressed route with ip6_rt_put_flags(), but leaves res->rt6 pointing at the released rt6_info. If no later rule supplies a replacement, fib6_rule_lookup() still sees res.rt6 and returns that stale dst to its caller. A suppressing rule can therefore leak a released route back to rt6_lookup(), and the next put hits rcuref_put_slowpath() from dst_release(). Clear res->rt6 when suppressing the route so suppressed lookups fall through to the null dst instead of reusing the released one.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/354db6243eca59e9d187ffbf8b7955b044ce84dc
https://git.kernel.org/stable/c/5d29b286c9de0b309e94b9ed083aa1a2f429434f
https://git.kernel.org/stable/c/6aea62e433fe1b586202a5fee8b5807ce635e1d7
https://git.kernel.org/stable/c/6d98c70fe0ba8c7708bfd5b2a5174d2086775daa
https://git.kernel.org/stable/c/90c57310e266eb94e4a80d6b15a9ca131d2e82cb
https://git.kernel.org/stable/c/9bad152c42b37499162367fe47867411e62fffa3
https://git.kernel.org/stable/c/a341c091ca0bfae377747b1b59a3bd8ebe18a937
https://git.kernel.org/stable/c/dc3ab04220667f254f4348572b2a0b3febff89fb

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-21 17:16

Updated : 2026-08-25 06:18

NVD link : CVE-2026-74581

Mitre link : CVE-2026-74581

CVE.ORG link : CVE-2026-74581

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-74581", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "209d35ee34e25f9668c404350a1c86d914c54ffa", "lessThan": "90c57310e266eb94e4a80d6b15a9ca131d2e82cb", "versionType": "git"}, {"status": "affected", "version": "8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383", "lessThan": "5d29b286c9de0b309e94b9ed083aa1a2f429434f", "versionType": "git"}, {"status": "affected", "version": "cdef485217d30382f3bf6448c54b4401648fe3f1", "lessThan": "354db6243eca59e9d187ffbf8b7955b044ce84dc", "versionType": "git"}, {"status": "affected", "version": "cdef485217d30382f3bf6448c54b4401648fe3f1", "lessThan": "6d98c70fe0ba8c7708bfd5b2a5174d2086775daa", "versionType": "git"}, {"status": "affected", "version": "cdef485217d30382f3bf6448c54b4401648fe3f1", "lessThan": "9bad152c42b37499162367fe47867411e62fffa3", "versionType": "git"}, {"status": "affected", "version": "cdef485217d30382f3bf6448c54b4401648fe3f1", "lessThan": "dc3ab04220667f254f4348572b2a0b3febff89fb", "versionType": "git"}, {"status": "affected", "version": "cdef485217d30382f3bf6448c54b4401648fe3f1", "lessThan": "a341c091ca0bfae377747b1b59a3bd8ebe18a937", "versionType": "git"}, {"status": "affected", "version": "cdef485217d30382f3bf6448c54b4401648fe3f1", "lessThan": "6aea62e433fe1b586202a5fee8b5807ce635e1d7", "versionType": "git"}, {"status": "affected", "version": "ee38eb8cf9a7323884c2b8e0adbbeb2192d31e29", "versionType": "git"}, {"status": "affected", "version": "5.10.84", "lessThan": "5.10.265", "versionType": "semver"}, {"status": "affected", "version": "5.15.7", "lessThan": "5.15.216", "versionType": "semver"}, {"status": "affected", "version": "5.4.164", "lessThan": "5.5", "versionType": "semver"}], "programFiles": ["net/ipv6/fib6_rules.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.16"}, {"status": "unaffected", "version": "0", "lessThan": "5.16", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.265", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.216", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.183", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.151", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.103", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.44", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.8", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv6/fib6_rules.c"], "defaultStatus": "affected"}]}], "published": "2026-08-21T17:16:44.363", "references": [{"url": "https://git.kernel.org/stable/c/354db6243eca59e9d187ffbf8b7955b044ce84dc", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5d29b286c9de0b309e94b9ed083aa1a2f429434f", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6aea62e433fe1b586202a5fee8b5807ce635e1d7", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6d98c70fe0ba8c7708bfd5b2a5174d2086775daa", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/90c57310e266eb94e4a80d6b15a9ca131d2e82cb", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9bad152c42b37499162367fe47867411e62fffa3", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a341c091ca0bfae377747b1b59a3bd8ebe18a937", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/dc3ab04220667f254f4348572b2a0b3febff89fb", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv6: clear suppressed fib6 rule result\n\nfib6_rule_suppress() drops a suppressed route with ip6_rt_put_flags(),\nbut leaves res->rt6 pointing at the released rt6_info.\n\nIf no later rule supplies a replacement, fib6_rule_lookup() still sees\nres.rt6 and returns that stale dst to its caller. A suppressing rule can\ntherefore leak a released route back to rt6_lookup(), and the next put\nhits rcuref_put_slowpath() from dst_release().\n\nClear res->rt6 when suppressing the route so suppressed lookups fall\nthrough to the null dst instead of reusing the released one."}], "lastModified": "2026-08-25T06:18:31.437", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}