CVE-2026-52915

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This follows the existing xtables\npattern of rejecting invalid user-provided counts in checkentry() and\nkeeps the packet matching path unchanged.\n\n`struct ip6t_opts` has a fixed `opts[IP6T_OPTS_OPTSNR]` array,\nwhere `IP6T_OPTS_OPTSNR` is 16, then off-by-one array access is possible:\n\n[ 137.924693][ T8692] UBSAN: array-index-out-of-bounds in ../net/ipv6/netfilter/ip6t_hbh.c:110:29\n[ 137.926167][ T8692] index 16 is out of range for type '__u16 [16]'"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The attacker must locally install a malformed IPv6 xtables/nft_compat hbh or dst match rule; the later packet evaluation can be driven by traffic, but the vulnerable state is created through local netfilter control interfaces.\nAC:L - No race or rare external condition is required: the attacker supplies optsnr > 16 and then causes matching IPv6 extension-header traffic to be evaluated.\nPR:L - Rule installation requires CAP_NET_ADMIN in the target network namespace, and netfilter configuration is reachable by an unprivileged local user via a user+network namespace on systems allowing user namespaces.\nUI:N - Once the attacker has local access and required namespace capability, no victim action is needed to install the malformed rule or trigger packet evaluation.\nS:U - The impact remains within the kernel/network namespace security authority; this is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - The oversized optsnr causes out-of-bounds reads past the fixed opts[16] array into adjacent kernel memory, and repeated attacker-controlled packet comparisons can serve as a kernel-memory disclosure oracle.\nI:N - The vulnerable code only reads out-of-bounds values and compares them with packet option bytes; it does not provide an out-of-bounds write or direct data modification primitive.\nA:H - The out-of-bounds array access can run past the installed match object during packet evaluation and was observed by UBSAN; in hardened or unlucky memory layouts this can produce an oops/panic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/netfilter/ip6t_hbh.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "2d523ba48d4ecc46acfb6aba548292cfcce1ac02", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "588933f1a2ca5ff99274f8c9f25dc3a25d0191c3", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "784aadea7a108c9f90985683caa87fb0198c6a39", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": 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this is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - The oversized optsnr causes out-of-bounds reads past the fixed opts[16] array into adjacent kernel memory, and repeated attacker-controlled packet comparisons can serve as a kernel-memory disclosure oracle.\nI:N - The vulnerable code only reads out-of-bounds values and compares them with packet option bytes; it does not provide an out-of-bounds write or direct data modification primitive.\nA:H - The out-of-bounds array access can run past the installed match object during packet evaluation and was observed by UBSAN; in hardened or unlucky memory layouts this can produce an oops/panic."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "2d523ba48d4ecc46acfb6aba548292cfcce1ac02", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "588933f1a2ca5ff99274f8c9f25dc3a25d0191c3", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "784aadea7a108c9f90985683caa87fb0198c6a39", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "41ec2e242f1702e8370ddfe14d22b7a766021c3e", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "db0250470f023f159094052c0bd5ab026a88ae93", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "57b0ac5e1b46f1f0338dff392ef2092e2871b412", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6feb43c0995ab3a9c826707eb46541a1696fe4f7", "versionType": "git"}, {"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "4322dcde6b4173c2d8e8e6118ed290794263bcc8", "versionType": "git"}], "programFiles": ["net/ipv6/netfilter/ip6t_hbh.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.12"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.12", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.258", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.209", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.142", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.92", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.34", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.11", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv6/netfilter/ip6t_hbh.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/2d523ba48d4ecc46acfb6aba548292cfcce1ac02"}, {"url": "https://git.kernel.org/stable/c/588933f1a2ca5ff99274f8c9f25dc3a25d0191c3"}, {"url": "https://git.kernel.org/stable/c/784aadea7a108c9f90985683caa87fb0198c6a39"}, {"url": "https://git.kernel.org/stable/c/41ec2e242f1702e8370ddfe14d22b7a766021c3e"}, {"url": "https://git.kernel.org/stable/c/db0250470f023f159094052c0bd5ab026a88ae93"}, {"url": "https://git.kernel.org/stable/c/57b0ac5e1b46f1f0338dff392ef2092e2871b412"}, {"url": "https://git.kernel.org/stable/c/6feb43c0995ab3a9c826707eb46541a1696fe4f7"}, {"url": "https://git.kernel.org/stable/c/4322dcde6b4173c2d8e8e6118ed290794263bcc8"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ip6t_hbh: reject oversized option lists\n\nstruct ip6t_opts stores at most IP6T_OPTS_OPTSNR option descriptors,\nbut hbh_mt6_check() does not reject larger optsnr values supplied from\nuserspace.\n\nValidate optsnr in the rule setup path so only match data that fits the\nfixed-size opts array can be installed. 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from\nuserspace.\n\nValidate optsnr in the rule setup path so only match data that fits the\nfixed-size opts array can be installed. This follows the existing xtables\npattern of rejecting invalid user-provided counts in checkentry() and\nkeeps the packet matching path unchanged.\n\n`struct ip6t_opts` has a fixed `opts[IP6T_OPTS_OPTSNR]` array,\nwhere `IP6T_OPTS_OPTSNR` is 16, then off-by-one array access is possible:\n\n[ 137.924693][ T8692] UBSAN: array-index-out-of-bounds in ../net/ipv6/netfilter/ip6t_hbh.c:110:29\n[ 137.926167][ T8692] index 16 is out of range for type '__u16 [16]'"}], "id": "CVE-2026-52915", "lastModified": "2026-10-19T20:18:46.147", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-52915", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:22:35.445064Z", "version": "2.0.3"}}]}, "published": "2026-06-24T08:16:21.340", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2d523ba48d4ecc46acfb6aba548292cfcce1ac02"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/41ec2e242f1702e8370ddfe14d22b7a766021c3e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4322dcde6b4173c2d8e8e6118ed290794263bcc8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/57b0ac5e1b46f1f0338dff392ef2092e2871b412"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/588933f1a2ca5ff99274f8c9f25dc3a25d0191c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6feb43c0995ab3a9c826707eb46541a1696fe4f7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/784aadea7a108c9f90985683caa87fb0198c6a39"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/db0250470f023f159094052c0bd5ab026a88ae93"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-129"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-125"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: netfilter: ip6t_hbh: reject oversized option lists", "id": "2492119", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492119"}, "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-787", "details": ["A flaw was found in the Linux kernel's netfilter subsystem, specifically within the ip6t_hbh module responsible for handling IPv6 Hop-by-Hop (HBH) options. This vulnerability allows a local attacker to provide an oversized list of HBH options from userspace, leading to an out-of-bounds write. This can result in memory corruption and potentially cause a system crash, leading to a denial of service."], "name": "CVE-2026-52915", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52915\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52915\nhttps://lore.kernel.org/linux-cve-announce/2026062429-CVE-2026-52915-44dd@gregkh/T"], "threat_severity": "Moderate"}

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