CVE-2026-90392

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90392", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.810Z", "datePublished": "2026-09-17T16:09:25.738Z", "dateUpdated": "2026-10-30T12:35:28.141Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:35:28.141Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix potential UAF when reading bpf link info\n\nIn bpf_link_show_fdinfo and bpf_link_get_info_by_fd, link->prog is\naccessed without holding any locks. If the prog is concurrently replaced\nvia bpf_link_update, the old prog can be freed, leading to a potential\nUAF issue.\n\nFix this by accessing link->prog under RCU protection to safely fetch\nthe pointer and guarantee its lifetime while reading its fields."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The dangling link->prog is read from the local bpf(2) BPF_OBJ_GET_INFO_BY_FD command (bpf_obj_get_info_by_fd()->bpf_link_get_info_by_fd()) or from bpf_link_show_fdinfo() when reading /proc/self/fdinfo on a bpf_link fd; neither path takes the malformed state from a network protocol.\nAC:L - The attacker owns both sides: one thread issues BPF_LINK_UPDATE so link_update() runs cgroup_bpf_replace()/tcx_link_update()/sock_map_link_update_prog() which xchg(&link->prog) and bpf_prog_put() the old program, while another thread they control races bpf_link_get_info_by_fd() or bpf_link_show_fdinfo(), which sleeps in seq_printf after capturing the pointer.\nPR:L - Creating a replaceable link requires bpf_prog_load() of a type whose ops implement update_prog (CGROUP_SKB, SCHED_CLS, SK_SKB, XDP, FLOW_DISSECTOR) plus BPF_LINK_CREATE; those paths require bpf_token_capable(CAP_BPF) and usually CAP_NET_ADMIN (CGROUP_SKB attach also checks it in bpf_prog_attach_check_attach_type), which a BPF token delegates into a user namespace.\nUI:N - The attacker loads two programs, BPF_LINK_CREATE the first as a cgroup/tcx/sockmap/xdp/netns link, closes the old program fd so the link holds the last ref, then races BPF_LINK_UPDATE against BPF_OBJ_GET_INFO_BY_FD or fdinfo in their own process; no other user action is required.\nS:U - The use-after-free is of the replaced bpf_prog inside bpf_link_get_info_by_fd()/bpf_link_show_fdinfo() on the host kernel; impact is local kernel memory corruption and privilege escalation, not a VM, IOMMU, or other authority-boundary cross.\nC:H - After the concurrent bpf_prog_put(), bpf_link_get_info_by_fd() reads prog->aux->id and bpf_link_show_fdinfo() copies prog->tag then aux->id from the freed bpf_prog; __bpf_prog_free() kfree()s the kmalloc bpf_prog_aux, so reclaiming that object turns the dangling aux pointer into an arbitrary kernel read.\nI:H - The same bpf_prog/bpf_prog_aux use-after-free after cgroup_bpf_replace() (or tcx/sockmap/xdp/netns update_prog) lets the attacker spray the freed kmalloc aux and vmalloc prog; kernel heap UAF of those objects yields write and control-flow hijack primitives.\nA:H - bpf_link_get_info_by_fd() and bpf_link_show_fdinfo() dereference the freed bpf_prog and prog->aux after BPF_LINK_UPDATE drops the last ref via bpf_prog_put(); a recycled or poisoned aux pointer causes a kernel oops."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/syscall.c"], "versions": [{"version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab", "lessThan": "4c8432a332d4a24dc2742f56062a53d8fad36f53", "status": "affected", "versionType": "git"}, {"version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab", "lessThan": "a5c936ac904767fc1d943d40b0308bcb2ae2509b", "status": "affected", "versionType": "git"}, {"version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab", "lessThan": "d7d7208e2603b45724b684f4df73904fb347741e", "status": "affected", "versionType": "git"}, {"version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab", "lessThan": "85cf991c881e7198be32be05a9daa2625390c8b3", "status": "affected", "versionType": "git"}, {"version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab", "lessThan": "79347e42cfbc9e78872922e8f08a70609c9af82f", "status": "affected", "versionType": "git"}, {"version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab", "lessThan": "863f3ddd0b8ac65abfb50d3be0869268ac0e277b", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/syscall.c"], "versions": [{"version": "5.7", "status": "affected"}, {"version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "5.7", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4c8432a332d4a24dc2742f56062a53d8fad36f53"}, {"url": "https://git.kernel.org/stable/c/a5c936ac904767fc1d943d40b0308bcb2ae2509b"}, {"url": "https://git.kernel.org/stable/c/d7d7208e2603b45724b684f4df73904fb347741e"}, {"url": "https://git.kernel.org/stable/c/85cf991c881e7198be32be05a9daa2625390c8b3"}, {"url": "https://git.kernel.org/stable/c/79347e42cfbc9e78872922e8f08a70609c9af82f"}, {"url": "https://git.kernel.org/stable/c/863f3ddd0b8ac65abfb50d3be0869268ac0e277b"}], "title": "bpf: Fix potential UAF when reading bpf link info", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/bpf/syscall.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4c8432a332d4a24dc2742f56062a53d8fad36f53", "status": "affected", "version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab", "versionType": "git"}, {"lessThan": "a5c936ac904767fc1d943d40b0308bcb2ae2509b", "status": "affected", "version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab", "versionType": "git"}, {"lessThan": "d7d7208e2603b45724b684f4df73904fb347741e", "status": "affected", "version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab", "versionType": "git"}, {"lessThan": "85cf991c881e7198be32be05a9daa2625390c8b3", "status": "affected", "version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab", "versionType": "git"}, {"lessThan": "79347e42cfbc9e78872922e8f08a70609c9af82f", "status": "affected", "version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab", "versionType": "git"}, {"lessThan": "863f3ddd0b8ac65abfb50d3be0869268ac0e277b", "status": "affected", "version": "0c991ebc8c69d29b7fc44db17075c5aa5253e2ab", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/bpf/syscall.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.7"}, {"lessThan": "5.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix potential UAF when reading bpf link info\n\nIn bpf_link_show_fdinfo and bpf_link_get_info_by_fd, link->prog is\naccessed without holding any locks. If the prog is concurrently replaced\nvia bpf_link_update, the old prog can be freed, leading to a potential\nUAF issue.\n\nFix this by accessing link->prog under RCU protection to safely fetch\nthe pointer and guarantee its lifetime while reading its fields."}], "id": "CVE-2026-90392", "lastModified": "2026-10-30T13:20:52.067", "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"}]}, "published": "2026-09-17T17:17:38.790", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4c8432a332d4a24dc2742f56062a53d8fad36f53"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/79347e42cfbc9e78872922e8f08a70609c9af82f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/85cf991c881e7198be32be05a9daa2625390c8b3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/863f3ddd0b8ac65abfb50d3be0869268ac0e277b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a5c936ac904767fc1d943d40b0308bcb2ae2509b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d7d7208e2603b45724b684f4df73904fb347741e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0c991ebc8c69d29b7fc44db17075c5aa5253e2ab,a5c936ac904767fc1d943d40b0308bcb2ae2509b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0c991ebc8c69d29b7fc44db17075c5aa5253e2ab,d7d7208e2603b45724b684f4df73904fb347741e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0c991ebc8c69d29b7fc44db17075c5aa5253e2ab,85cf991c881e7198be32be05a9daa2625390c8b3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0c991ebc8c69d29b7fc44db17075c5aa5253e2ab,79347e42cfbc9e78872922e8f08a70609c9af82f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0c991ebc8c69d29b7fc44db17075c5aa5253e2ab,863f3ddd0b8ac65abfb50d3be0869268ac0e277b)"}}], "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": "5.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.157,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "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": "2026-09-19T14:15:17.560156+00:00", "updated": "2026-09-20T05:30:16.595261+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416"]}