CVE-2022-50048

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it is not reachable from remote packet processing.\nAC:L - The attacker fully controls set creation with a stateful clone-capable expression (counter/limit/quota/last/connlimit) and element adds that omit per-element expressions, and can induce the GFP_ATOMIC clone allocation failure via memory pressure, so the underflow is reliably triggerable with no race or luck.\nPR:L - nfnetlink_rcv() gates on netlink_net_capable(skb, CAP_NET_ADMIN) against the network namespace's user_ns, so an ordinary unprivileged user obtains the needed capability via unshare -Urn on default distributions.\nUI:N - The attacker creates the set, induces clone failure, and triggers the destroy/module_put error path entirely from their own process with no victim action required.\nS:U - Impact is confined to the host kernel (module UAF / refcount corruption and privilege escalation within the same OS security authority); no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The erroneous module_put without a matching get underflows the expression module's refcount so it can be unloaded while set expressions still reference its ops/code, yielding a classic module UAF that enables arbitrary kernel memory disclosure.\nI:H - Premature unload of nft_limit/nft_quota/nft_connlimit (or nf_tables for built-in counter/last) leaves live expression ops pointing into freed module memory that can be sprayed for control-flow hijack; the connlimit path also wrongly calls nf_ct_netns_put, compounding refcount corruption.\nA:H - On connlimit, destroy runs nf_conncount_cache_free(NULL) and NULL-dereferences; on other expressions the module refcount underflow/UAF produces oops/panic, so availability impact is High even without full exploitation."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nf_tables_api.c"], "versions": [{"version": "8cfd9b0f8515e7c361bba27e2a2684cbd427fe01", "lessThan": "b59bee8b05b0e789b5a298cacb09e8aaa3367a29", "status": "affected", "versionType": "git"}, {"version": "8cfd9b0f8515e7c361bba27e2a2684cbd427fe01", "lessThan": "1e52e6cfec6342c3d0df47dc3a76724fb3dabf56", "status": "affected", "versionType": "git"}, {"version": "8cfd9b0f8515e7c361bba27e2a2684cbd427fe01", "lessThan": "c485c35ff6783ccd12c160fcac6a0e504e83e0bf", "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/netfilter/nf_tables_api.c"], "versions": [{"version": "5.11", "status": "affected"}, {"version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.63", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.19.4", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0", "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": "5.11", "versionEndExcluding": "5.15.63"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.19.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b59bee8b05b0e789b5a298cacb09e8aaa3367a29"}, {"url": "https://git.kernel.org/stable/c/1e52e6cfec6342c3d0df47dc3a76724fb3dabf56"}, {"url": "https://git.kernel.org/stable/c/c485c35ff6783ccd12c160fcac6a0e504e83e0bf"}], "title": "netfilter: nf_tables: possible module reference underflow in error path", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/netfilter/nf_tables_api.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "b59bee8b05b0e789b5a298cacb09e8aaa3367a29", "status": "affected", "version": "8cfd9b0f8515e7c361bba27e2a2684cbd427fe01", "versionType": "git"}, {"lessThan": "1e52e6cfec6342c3d0df47dc3a76724fb3dabf56", "status": "affected", "version": "8cfd9b0f8515e7c361bba27e2a2684cbd427fe01", "versionType": "git"}, {"lessThan": "c485c35ff6783ccd12c160fcac6a0e504e83e0bf", "status": "affected", "version": "8cfd9b0f8515e7c361bba27e2a2684cbd427fe01", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/netfilter/nf_tables_api.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.11"}, {"lessThan": "5.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.63", "versionType": "semver"}, {"lessThanOrEqual": "5.19.*", "status": "unaffected", "version": "5.19.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D5744A03-DA40-4A78-9063-13179361DC6D", "versionEndExcluding": "5.15.63", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0E669300-DA42-4ACD-86D8-68BE5F29FB88", "versionEndExcluding": "5.19.4", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "E8BD11A3-8643-49B6-BADE-5029A0117325", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: possible module reference underflow in error path\n\ndst->ops is set on when nft_expr_clone() fails, but module refcount has\nnot been bumped yet, therefore nft_expr_destroy() leads to module\nreference underflow."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: nf_tables: posible desbordamiento de referencia de m\u00f3dulo en la ruta de error dst->ops est\u00e1 activado cuando nft_expr_clone() falla, pero el recuento de referencias del m\u00f3dulo a\u00fan no se ha incrementado, por lo tanto, nft_expr_destroy() provoca un desbordamiento de referencia de m\u00f3dulo."}], "id": "CVE-2022-50048", "lastModified": "2026-08-04T10:18:03.710", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"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": "2025-06-18T11:15:33.393", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1e52e6cfec6342c3d0df47dc3a76724fb3dabf56"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b59bee8b05b0e789b5a298cacb09e8aaa3367a29"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c485c35ff6783ccd12c160fcac6a0e504e83e0bf"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: netfilter: nf_tables: possible module reference underflow in error path", "id": "2373580", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373580"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: nf_tables: possible module reference underflow in error path\ndst->ops is set on when nft_expr_clone() fails, but module refcount has\nnot been bumped yet, therefore nft_expr_destroy() leads to module\nreference underflow."], "name": "CVE-2022-50048", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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": "2025-06-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-50048\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50048\nhttps://lore.kernel.org/linux-cve-announce/2025061845-CVE-2022-50048-40d7@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-06-23T08:45:29.808011+00:00", "updated": "2025-06-23T08:45:29.808071+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}