{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74720", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.929Z", "datePublished": "2026-08-22T15:33:13.342Z", "dateUpdated": "2026-10-16T19:16:11.811Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:42:01.009Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Preserve pointer state for commuted arithmetic\n\nWhen scalar += pointer is handled in adjust_ptr_min_max_vals(), the\ndestination register inherits the pointer state from the source pointer.\nCopying only selected fields is fragile because pointer provenance is\ntracked by several bpf_reg_state fields.\n\nUse the caller's temporary offset register to preserve the scalar operand\nwhile replacing the destination with the full pointer state. This preserves\nthe frame number for PTR_TO_STACK registers and keeps parent identity\nfields consistent." } ], "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 flaw is in bpf_check()/adjust_ptr_min_max_vals() during bpf(BPF_PROG_LOAD) via the local bpf(2) syscall; per kernel CNA guidance BPF verifier bugs are Local, not reachable from remote network packet handling.\nAC:L - An attacker fully controls BPF bytecode using commuted 64-bit scalar+=pointer ALU and bpf2bpf call chains, deterministically poisoning register state during verification without races or external preconditions.\nPR:L - Exploitation requires loading bpf2bpf programs (CAP_BPF-gated), which is routinely available to unprivileged users via user namespaces/BPF token delegation or unprivileged socket-filter loading when kernel.unprivileged_bpf_disabled=0, not init-namespace root.\nUI:N - The attacker loads and executes their own crafted BPF program through bpf(2); no separate victim action such as mounting filesystems or opening files is required beyond the attacker's own local access.\nS:U - Impact is a BPF verifier bypass enabling in-kernel out-of-bounds memory access and privilege escalation within the host kernel's security authority; it does not cross VM, IOMMU, or sandbox boundaries.\nC:H - Copying only type/id on scalar+=pointer leaves stale frameno, var_off, and map/parent metadata, so bpf_func() stack checks validate the wrong frame and approve out-of-bounds reads of adjacent kernel memory.\nI:H - The same incorrect pointer provenance permits verifier-approved out-of-bounds BPF stack/map writes at runtime, a controllable kernel memory corruption primitive leverageable for arbitrary modification and privilege escalation.\nA:H - Out-of-bounds BPF memory accesses from the bypassed verifier state can corrupt critical kernel data or dereference invalid addresses, reliably causing kernel oops/panic and repeatable denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/verifier.c" ], "versions": [ { "version": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941", "lessThan": "86b203aadc2930e0a4f9c6277b5b80ff3664c472", "status": "affected", "versionType": "git" }, { "version": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941", "lessThan": "8109c25e0c41f5f19a1c2380bb49c991a877494e", "status": "affected", "versionType": "git" }, { "version": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941", "lessThan": "d1959028190a7649b926f5867a58de5fe221b23c", "status": "affected", "versionType": "git" }, { "version": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941", "lessThan": "8cb23101a3fcc7432b451ea3d0f14a90711f4acf", "status": "affected", "versionType": "git" }, { "version": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941", "lessThan": "29c239f8dbec5ab33a61796724d189bddee6cd4b", "status": "affected", "versionType": "git" }, { "version": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941", "lessThan": "db6382ed3361bdd8129572a3423956cba1dae829", "status": "affected", "versionType": "git" }, { "version": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941", "lessThan": "eaffa1495e4fe6330aeff9f323ea3d48b01f118a", "status": "affected", "versionType": "git" }, { "version": "f4d7e40a5b7157e1329c3c5b10f60d8289fc2941", "lessThan": "a4c6f804b44c5c790269b25e0e61cf4e9f117c86", "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/verifier.c" ], "versions": [ { "version": "4.16", "status": "affected" }, { "version": "0", "lessThan": "4.16", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "4.16", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.6.152" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.12.104" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "6.18.45" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "7.1.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.16", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/86b203aadc2930e0a4f9c6277b5b80ff3664c472" }, { "url": "https://git.kernel.org/stable/c/8109c25e0c41f5f19a1c2380bb49c991a877494e" }, { "url": "https://git.kernel.org/stable/c/d1959028190a7649b926f5867a58de5fe221b23c" }, { "url": "https://git.kernel.org/stable/c/8cb23101a3fcc7432b451ea3d0f14a90711f4acf" }, { "url": "https://git.kernel.org/stable/c/29c239f8dbec5ab33a61796724d189bddee6cd4b" }, { "url": "https://git.kernel.org/stable/c/db6382ed3361bdd8129572a3423956cba1dae829" }, { "url": "https://git.kernel.org/stable/c/eaffa1495e4fe6330aeff9f323ea3d48b01f118a" }, { "url": "https://git.kernel.org/stable/c/a4c6f804b44c5c790269b25e0e61cf4e9f117c86" } ], "title": "bpf: Preserve pointer state for commuted arithmetic", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-74720", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:15:35.375502Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:16:11.811Z" } } ] } }