{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74305", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.882Z", "datePublished": "2026-08-15T05:58:06.654Z", "dateUpdated": "2026-08-17T05:45:39.394Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:45:39.394Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Tighten cgroup storage cookie checks for prog arrays\n\nThe fix in commit abad3d0bad72 (\"bpf: Fix oob access in cgroup local\nstorage\") is still incomplete. The prog-array compatibility check\ntreats a program with no cgroup storage as compatible with any stored\nstorage cookie. This allows a storage-less program to bridge a tail\ncall chain between an entry program and a storage-using callee even\nthough cgroup local storage at runtime still follows the caller's\ncontext, that is, A -> B(no storage) -> C(storage) path.\n\nRequiring exact cookie equality would break the legitimate case of a\nstorage-less leaf program being tail called from a storage-using one.\nInstead, only accept a zero storage cookie if the program cannot\nperform tail calls itself. This keeps A -> B(no storage) working\nwhile rejecting the A -> B(no storage) -> C(storage) bridge." } ], "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 - Exploitation requires local bpf() syscalls to load cgroup BPF programs/maps, populate a prog array, attach or test-run them; per kernel guidance BPF/cgroup hooks are Local even when later triggered by sockets or packets.\nAC:L - The attacker fully controls crafting programs A/B/C, prog-array insertion order, and triggering the cgroup hook or BPF_PROG_TEST_RUN; no race or victim-dependent state is required to reach the mismatched-storage OOB path.\nPR:L - Reaching the buggy compatibility check needs only local BPF privileges (CAP_BPF or unprivileged BPF where enabled) plus cgroup attach/test-run access obtainable by unprivileged users in delegated cgroups or user namespaces, not init-namespace root.\nUI:N - The attacker loads, wires, and triggers the malicious BPF program chain itself (e.g., creating a socket or using BPF_PROG_TEST_RUN); no action by another user or administrator is required.\nS:U - The out-of-bounds cgroup local storage access corrupts kernel heap memory within the same kernel security domain and enables local privilege escalation, not a cross-boundary VM, IOMMU, or sandbox escape.\nC:H - Tail-called program C obtains a pointer from bpf_get_local_storage() backed by entry program A's smaller cgroup storage while verifier-approved helpers perform larger accesses, yielding controllable out-of-bounds kernel heap reads.\nI:H - The returned cgroup storage pointer is writable map memory, and size-mismatched helper copies (e.g., bpf_map_update_elem/copy_map_value_long) enable controllable out-of-bounds heap writes exploitable for kernel corruption and code execution.\nA:H - The heap out-of-bounds read/write can corrupt adjacent kernel objects and readily trigger kernel oops/panic or denial of service, as demonstrated by the cgroup_storage_oob selftest expecting KASAN reports without the fix." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/core.c" ], "versions": [ { "version": "c1c74584b9b4043c52e41fec415226e582d266a3", "lessThan": "87177497cca90bf4fcfb759eb898560eb5b46a10", "status": "affected", "versionType": "git" }, { "version": "66da7cee78590259b400e51a70622ccd41da7bb2", "lessThan": "1c762d28698483ce7c372091f34d86e4d4828652", "status": "affected", "versionType": "git" }, { "version": "7acfa07c585e3d7a64654d38f0a5c762877d0b9b", "lessThan": "eb73056ce2a6f101ddd3bdba89af6b24ebffff85", "status": "affected", "versionType": "git" }, { "version": "41688d1fc5d163a6c2c0e95c0419e2cb31a44648", "lessThan": "9ca06849c4239aa2d580c54651f8588c51cb398b", "status": "affected", "versionType": "git" }, { "version": "abad3d0bad72a52137e0c350c59542d75ae4f513", "lessThan": "46fbafe3d2d569d828e8d24a7dbe1659f63685cf", "status": "affected", "versionType": "git" }, { "version": "abad3d0bad72a52137e0c350c59542d75ae4f513", "lessThan": "cb22dc79528eb26a46d346c3118dbd6b14c70609", "status": "affected", "versionType": "git" }, { "version": "abad3d0bad72a52137e0c350c59542d75ae4f513", "lessThan": "10627ddc0167aab5c1c390a10ef461e9937aba08", "status": "affected", "versionType": "git" }, { "version": "19341d5c59e8c7e8528e40f8663e99d67810473c", "status": "affected", "versionType": "git" }, { "version": "5.15.192", "lessThan": "5.15.212", "status": "affected", "versionType": "semver" }, { "version": "6.1.151", "lessThan": "6.1.178", "status": "affected", "versionType": "semver" }, { "version": "6.6.105", "lessThan": "6.6.145", "status": "affected", "versionType": "semver" }, { "version": "6.12.46", "lessThan": "6.12.97", "status": "affected", "versionType": "semver" }, { "version": "6.16.1", "lessThan": "6.17", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/core.c" ], "versions": [ { "version": "6.17", "status": "affected" }, { "version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "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": "5.15.192", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.151", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.105", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.46", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/87177497cca90bf4fcfb759eb898560eb5b46a10" }, { "url": "https://git.kernel.org/stable/c/1c762d28698483ce7c372091f34d86e4d4828652" }, { "url": "https://git.kernel.org/stable/c/eb73056ce2a6f101ddd3bdba89af6b24ebffff85" }, { "url": "https://git.kernel.org/stable/c/9ca06849c4239aa2d580c54651f8588c51cb398b" }, { "url": "https://git.kernel.org/stable/c/46fbafe3d2d569d828e8d24a7dbe1659f63685cf" }, { "url": "https://git.kernel.org/stable/c/cb22dc79528eb26a46d346c3118dbd6b14c70609" }, { "url": "https://git.kernel.org/stable/c/10627ddc0167aab5c1c390a10ef461e9937aba08" } ], "title": "bpf: Tighten cgroup storage cookie checks for prog arrays", "x_generator": { "engine": "bippy-1.2.0" } } } }