CVE-2026-53089

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If the netns refcount has already reached 0,\nget_net() performs a refcount_t increment on 0, triggering:\n\n refcount_t: addition on 0; use-after-free.\n\nAlthough rtnl_lock and bpf_devs_lock ensure the netdev pointer remains\nvalid, they cannot prevent the netns refcount from reaching zero.\n\nFix this by using maybe_get_net() instead of get_net(). maybe_get_net()\nuses refcount_inc_not_zero() and returns NULL if the refcount is already\nzero, which causes ns_get_path_cb() to fail and the caller to return\n-ENOENT -- the correct behavior when the netns is being destroyed."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/offload.c"], "versions": [{"version": "675fc275a3a2d905535207237402c6d8dcb5fa4b", "lessThan": "43d6848a2a6c92ccfd614d9f0bb6fd85b95dfa9d", "status": "affected", "versionType": "git"}, {"version": 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"https://git.kernel.org/stable/c/1a2dc103e16448d022a77ad5fc3234641436c4b7"}, {"url": "https://git.kernel.org/stable/c/85dc711f742b192eb97c0e00b521312f5a7a415e"}, {"url": "https://git.kernel.org/stable/c/a51e7fbe94a87e236631a83973d4f558310b2cd2"}, {"url": "https://git.kernel.org/stable/c/a0c584fc18056709c8e047a82a6045d6c209f4ce"}], "title": "bpf: Fix use-after-free in offloaded map/prog info fill", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-53089", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:18:12.065771Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:23:59.016Z"}}]}}

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If the netns refcount has already reached 0,\nget_net() performs a refcount_t increment on 0, triggering:\n\n refcount_t: addition on 0; use-after-free.\n\nAlthough rtnl_lock and bpf_devs_lock ensure the netdev pointer remains\nvalid, they cannot prevent the netns refcount from reaching zero.\n\nFix this by using maybe_get_net() instead of get_net(). maybe_get_net()\nuses refcount_inc_not_zero() and returns NULL if the refcount is already\nzero, which causes ns_get_path_cb() to fail and the caller to return\n-ENOENT -- the correct behavior when the netns is being destroyed."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.269", "versionStartIncluding": "4.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.220", "versionStartIncluding": "4.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.187", "versionStartIncluding": "4.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.156", "versionStartIncluding": "4.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.108", "versionStartIncluding": "4.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.49", "versionStartIncluding": "4.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.10", "versionStartIncluding": "4.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "4.16"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-02T12:49:34.606Z"}}}, "cveMetadata": {"cveId": "CVE-2026-53089", "state": "PUBLISHED", "dateUpdated": "2026-11-06T16:23:59.016Z", "dateReserved": "2026-06-09T07:44:35.384Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-06-24T16:30:28.531Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/bpf/offload.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "43d6848a2a6c92ccfd614d9f0bb6fd85b95dfa9d", "status": "affected", "version": "675fc275a3a2d905535207237402c6d8dcb5fa4b", "versionType": "git"}, {"lessThan": "642943ae5bdacabc8109dc4a5e0ebb4a6b99ef3e", "status": "affected", "version": "675fc275a3a2d905535207237402c6d8dcb5fa4b", "versionType": "git"}, {"lessThan": "fea55b034328feaafef75aee252f305e6f85a991", "status": "affected", "version": "675fc275a3a2d905535207237402c6d8dcb5fa4b", "versionType": "git"}, {"lessThan": "5662dac41a3442aa378d7c405164903eb109fc05", "status": "affected", "version": "675fc275a3a2d905535207237402c6d8dcb5fa4b", "versionType": "git"}, {"lessThan": "1a2dc103e16448d022a77ad5fc3234641436c4b7", "status": "affected", "version": "675fc275a3a2d905535207237402c6d8dcb5fa4b", "versionType": "git"}, {"lessThan": "85dc711f742b192eb97c0e00b521312f5a7a415e", "status": "affected", "version": "675fc275a3a2d905535207237402c6d8dcb5fa4b", "versionType": "git"}, {"lessThan": "a51e7fbe94a87e236631a83973d4f558310b2cd2", "status": "affected", "version": "675fc275a3a2d905535207237402c6d8dcb5fa4b", "versionType": "git"}, {"lessThan": "a0c584fc18056709c8e047a82a6045d6c209f4ce", "status": "affected", "version": "675fc275a3a2d905535207237402c6d8dcb5fa4b", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/bpf/offload.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.16"}, {"lessThan": "4.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.269", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.220", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.187", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.156", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.108", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.49", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.10", "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": "BE70B0A9-DD71-4EA5-8A36-E260911541E9", "versionEndExcluding": "7.0.10", "versionStartIncluding": "4.16", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix use-after-free in offloaded map/prog info fill\n\nWhen querying info for an offloaded BPF map or program,\nbpf_map_offload_info_fill_ns() and bpf_prog_offload_info_fill_ns()\nobtain the network namespace with get_net(dev_net(offmap->netdev)).\nHowever, the associated netdev's netns may be racing with teardown\nduring netns destruction. If the netns refcount has already reached 0,\nget_net() performs a refcount_t increment on 0, triggering:\n\n refcount_t: addition on 0; use-after-free.\n\nAlthough rtnl_lock and bpf_devs_lock ensure the netdev pointer remains\nvalid, they cannot prevent the netns refcount from reaching zero.\n\nFix this by using maybe_get_net() instead of get_net(). maybe_get_net()\nuses refcount_inc_not_zero() and returns NULL if the refcount is already\nzero, which causes ns_get_path_cb() to fail and the caller to return\n-ENOENT -- the correct behavior when the netns is being destroyed."}], "id": "CVE-2026-53089", "lastModified": "2026-11-06T17:18:05.513", "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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53089", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:18:12.065771Z", "version": "2.0.3"}}]}, "published": "2026-06-24T17:17:23.097", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1a2dc103e16448d022a77ad5fc3234641436c4b7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/43d6848a2a6c92ccfd614d9f0bb6fd85b95dfa9d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5662dac41a3442aa378d7c405164903eb109fc05"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/642943ae5bdacabc8109dc4a5e0ebb4a6b99ef3e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/85dc711f742b192eb97c0e00b521312f5a7a415e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0c584fc18056709c8e047a82a6045d6c209f4ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a51e7fbe94a87e236631a83973d4f558310b2cd2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fea55b034328feaafef75aee252f305e6f85a991"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: bpf: Fix use-after-free in offloaded map/prog info fill", "id": "2492324", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492324"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-911", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: Fix use-after-free in offloaded map/prog info fill\nWhen querying info for an offloaded BPF map or program,\nbpf_map_offload_info_fill_ns() and bpf_prog_offload_info_fill_ns()\nobtain the network namespace with get_net(dev_net(offmap->netdev)).\nHowever, the associated netdev's netns may be racing with teardown\nduring netns destruction. If the netns refcount has already reached 0,\nget_net() performs a refcount_t increment on 0, triggering:\nrefcount_t: addition on 0; use-after-free.\nAlthough rtnl_lock and bpf_devs_lock ensure the netdev pointer remains\nvalid, they cannot prevent the netns refcount from reaching zero.\nFix this by using maybe_get_net() instead of get_net(). maybe_get_net()\nuses refcount_inc_not_zero() and returns NULL if the refcount is already\nzero, which causes ns_get_path_cb() to fail and the caller to return\n-ENOENT -- the correct behavior when the netns is being destroyed.", "A flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) subsystem. When querying information for an offloaded BPF map or program, a race condition can occur during network namespace destruction. This can lead to a use-after-free vulnerability, potentially causing a system crash or denial of service."], "name": "CVE-2026-53089", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "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-2026-53089\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53089\nhttps://lore.kernel.org/linux-cve-announce/2026062409-CVE-2026-53089-fdd8@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[675fc275a3a2d905535207237402c6d8dcb5fa4b,a51e7fbe94a87e236631a83973d4f558310b2cd2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[675fc275a3a2d905535207237402c6d8dcb5fa4b,a0c584fc18056709c8e047a82a6045d6c209f4ce)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.10,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-06-24T21:00:11.770630+00:00", "updated": "2026-08-13T20:00:03.451305+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}