CVE-2026-63982

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63982", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.025Z", "datePublished": "2026-07-19T14:56:05.329Z", "dateUpdated": "2026-07-19T14:56:05.329Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-19T14:56:05.329Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: Fix ethx:ingress -> ethy:egress -> ethx:ingress mirred loop\n\nWhen mirred redirects to ingress (from either ingress or egress) the loop\nstate from sched_mirred_dev array dev is lost because of 1) the packet\ndeferral into the backlog and 2) the fact the sched_mirred_dev array is\ncleared. In such cases, if there was a loop we won't discover it.\n\nHere's a simple test to reproduce:\nip a add dev port0 10.10.10.11/24\n\ntc qdisc add dev port0 clsact\ntc filter add dev port0 egress protocol ip \\\n prio 10 matchall action mirred ingress redirect dev port1\n\ntc qdisc add dev port1 clsact\ntc filter add dev port1 ingress protocol ip \\\n prio 10 matchall action mirred egress redirect dev port0\n\nping -c 1 -W0.01 10.10.10.10"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/act_mirred.c"], "versions": [{"version": "906736728cea480a85803c67fafb1b0e78491922", "lessThan": "66f4607fe788fc7d81bce0e2f7b3726ed2f71284", "status": "affected", "versionType": "git"}, {"version": "fe946a751d9b52b7c45ca34899723b314b79b249", "lessThan": "45ac526a0d5733c3695946bd84ec57f24d8f5e66", "status": "affected", "versionType": "git"}, {"version": "fe946a751d9b52b7c45ca34899723b314b79b249", "lessThan": "db875221ab08d213a83bf30196ae8b64d55a3403", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/act_mirred.c"], "versions": [{"version": "6.19", "status": "affected"}, {"version": "0", "lessThan": "6.19", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.12", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.0.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/66f4607fe788fc7d81bce0e2f7b3726ed2f71284"}, {"url": "https://git.kernel.org/stable/c/45ac526a0d5733c3695946bd84ec57f24d8f5e66"}, {"url": "https://git.kernel.org/stable/c/db875221ab08d213a83bf30196ae8b64d55a3403"}], "title": "net/sched: Fix ethx:ingress -> ethy:egress -> ethx:ingress mirred loop", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sched/act_mirred.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "66f4607fe788fc7d81bce0e2f7b3726ed2f71284", "status": "affected", "version": "906736728cea480a85803c67fafb1b0e78491922", "versionType": "git"}, {"lessThan": "45ac526a0d5733c3695946bd84ec57f24d8f5e66", "status": "affected", "version": "fe946a751d9b52b7c45ca34899723b314b79b249", "versionType": "git"}, {"lessThan": "db875221ab08d213a83bf30196ae8b64d55a3403", "status": "affected", "version": "fe946a751d9b52b7c45ca34899723b314b79b249", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sched/act_mirred.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.19"}, {"lessThan": "6.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.12", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9161A938-0FA8-44BC-95FE-C5A271601AB3", "versionEndExcluding": "7.0.12", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*", "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*", "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*", "matchCriteriaId": "81DFF19E-9CF8-49C6-8C36-1E4038622933", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: Fix ethx:ingress -> ethy:egress -> ethx:ingress mirred loop\n\nWhen mirred redirects to ingress (from either ingress or egress) the loop\nstate from sched_mirred_dev array dev is lost because of 1) the packet\ndeferral into the backlog and 2) the fact the sched_mirred_dev array is\ncleared. In such cases, if there was a loop we won't discover it.\n\nHere's a simple test to reproduce:\nip a add dev port0 10.10.10.11/24\n\ntc qdisc add dev port0 clsact\ntc filter add dev port0 egress protocol ip \\\n prio 10 matchall action mirred ingress redirect dev port1\n\ntc qdisc add dev port1 clsact\ntc filter add dev port1 ingress protocol ip \\\n prio 10 matchall action mirred egress redirect dev port0\n\nping -c 1 -W0.01 10.10.10.10"}], "id": "CVE-2026-63982", "lastModified": "2026-11-12T17:37:10.477", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-07-19T16:17:17.390", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/45ac526a0d5733c3695946bd84ec57f24d8f5e66"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/66f4607fe788fc7d81bce0e2f7b3726ed2f71284"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/db875221ab08d213a83bf30196ae8b64d55a3403"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net/sched: Fix ethx:ingress -> ethy:egress -> ethx:ingress mirred loop", "id": "2502362", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502362"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-835", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/sched: Fix ethx:ingress -> ethy:egress -> ethx:ingress mirred loop\nWhen mirred redirects to ingress (from either ingress or egress) the loop\nstate from sched_mirred_dev array dev is lost because of 1) the packet\ndeferral into the backlog and 2) the fact the sched_mirred_dev array is\ncleared. In such cases, if there was a loop we won't discover it.\nHere's a simple test to reproduce:\nip a add dev port0 10.10.10.11/24\ntc qdisc add dev port0 clsact\ntc filter add dev port0 egress protocol ip \\\nprio 10 matchall action mirred ingress redirect dev port1\ntc qdisc add dev port1 clsact\ntc filter add dev port1 ingress protocol ip \\\nprio 10 matchall action mirred egress redirect dev port0\nping -c 1 -W0.01 10.10.10.10", "A flaw was found in the Linux kernel's network scheduler component. This vulnerability occurs when the `mirred` action, used for redirecting network traffic, fails to properly detect a redirection loop. An attacker can exploit this by crafting specific network configurations that cause packets to be endlessly redirected, leading to a Denial of Service (DoS) condition where system resources are exhausted and network operations are disrupted."], "name": "CVE-2026-63982", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63982\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63982\nhttps://lore.kernel.org/linux-cve-announce/2026071902-CVE-2026-63982-9bf5@gregkh/T"], "threat_severity": "Low"}

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