CVE-2026-74305 (GCVE-0-2026-74305)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-10-16 18:55
VLAI
Title
bpf: Tighten cgroup storage cookie checks for prog arrays
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Tighten cgroup storage cookie checks for prog arrays The fix in commit abad3d0bad72 ("bpf: Fix oob access in cgroup local storage") is still incomplete. The prog-array compatibility check treats a program with no cgroup storage as compatible with any stored storage cookie. This allows a storage-less program to bridge a tail call chain between an entry program and a storage-using callee even though cgroup local storage at runtime still follows the caller's context, that is, A -> B(no storage) -> C(storage) path. Requiring exact cookie equality would break the legitimate case of a storage-less leaf program being tail called from a storage-using one. Instead, only accept a zero storage cookie if the program cannot perform tail calls itself. This keeps A -> B(no storage) working while rejecting the A -> B(no storage) -> C(storage) bridge.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 18:52 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6992 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c1c74584b9b4043c52e41fec415226e582d266a3 , < 87177497cca90bf4fcfb759eb898560eb5b46a10 (git)
Affected: 66da7cee78590259b400e51a70622ccd41da7bb2 , < 1c762d28698483ce7c372091f34d86e4d4828652 (git)
Affected: 7acfa07c585e3d7a64654d38f0a5c762877d0b9b , < eb73056ce2a6f101ddd3bdba89af6b24ebffff85 (git)
Affected: 41688d1fc5d163a6c2c0e95c0419e2cb31a44648 , < 9ca06849c4239aa2d580c54651f8588c51cb398b (git)
Affected: abad3d0bad72a52137e0c350c59542d75ae4f513 , < 46fbafe3d2d569d828e8d24a7dbe1659f63685cf (git)
Affected: abad3d0bad72a52137e0c350c59542d75ae4f513 , < cb22dc79528eb26a46d346c3118dbd6b14c70609 (git)
Affected: abad3d0bad72a52137e0c350c59542d75ae4f513 , < 10627ddc0167aab5c1c390a10ef461e9937aba08 (git)
Affected: 19341d5c59e8c7e8528e40f8663e99d67810473c (git)
Affected: 5.15.192 , < 5.15.212 (semver)
Affected: 6.1.151 , < 6.1.178 (semver)
Affected: 6.6.105 , < 6.6.145 (semver)
Affected: 6.12.46 , < 6.12.97 (semver)
Affected: 6.16.1 , < 6.17 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        "id": "CVE-2026-74305",
        "lastModified": "2026-10-16T19:17:38.187",
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          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T20:41:11+00:00",
      "cve": "CVE-2026-74305",
      "id": "CVE-2026-74305",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "182",
      "product_status:known_not_affected": "92",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Tighten cgroup storage cookie checks for prog arrays",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74305.json",
      "version": "3"
    },
    "vulnrichment": {
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                  "content": {
                    "id": "CVE-2026-74305",
                    "options": [
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                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T18:52:53.092866Z",
                    "version": "2.0.3"
                  },
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
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              "product": "Linux",
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              "vendor": "Linux",
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                  "version": "7.2",
                  "versionType": "original_commit_for_fix"
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              "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\u0027s\ncontext, that is, A -\u003e B(no storage) -\u003e 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 -\u003e B(no storage) working\nwhile rejecting the A -\u003e B(no storage) -\u003e C(storage) bridge."
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                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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                  "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\u0027s 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."
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        "assignerShortName": "Linux",
        "cveId": "CVE-2026-74305",
        "datePublished": "2026-08-15T05:58:06.654Z",
        "dateReserved": "2026-08-15T05:44:03.882Z",
        "dateUpdated": "2026-10-16T18:55:31.883Z",
        "state": "PUBLISHED"
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}



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