{"id":"CVE-2026-74305","title":"bpf: Tighten cgroup storage cookie checks for prog arrays","summary":"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-…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= c1c74584b9b4043c52e41fec415226e582d266a3 < 87177497cca90bf4fcfb759eb898560eb5b46a10","Linux >= 66da7cee78590259b400e51a70622ccd41da7bb2 < 1c762d28698483ce7c372091f34d86e4d4828652","Linux >= 7acfa07c585e3d7a64654d38f0a5c762877d0b9b < eb73056ce2a6f101ddd3bdba89af6b24ebffff85","Linux >= 41688d1fc5d163a6c2c0e95c0419e2cb31a44648 < 9ca06849c4239aa2d580c54651f8588c51cb398b","Linux >= abad3d0bad72a52137e0c350c59542d75ae4f513 < 46fbafe3d2d569d828e8d24a7dbe1659f63685cf","Linux >= abad3d0bad72a52137e0c350c59542d75ae4f513 < cb22dc79528eb26a46d346c3118dbd6b14c70609","Linux >= abad3d0bad72a52137e0c350c59542d75ae4f513 < 10627ddc0167aab5c1c390a10ef461e9937aba08","Linux 19341d5c59e8c7e8528e40f8663e99d67810473c","Linux >= 5.15.192 < 5.15.212","Linux >= 6.1.151 < 6.1.178","Linux >= 6.6.105 < 6.6.145","Linux >= 6.12.46 < 6.12.97","Linux >= 6.16.1 < 6.17","Linux 6.17"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:52:53.092866Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:55:31.883Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74305","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"}],"tags":["cve.org"],"epss":0.00176,"epssPercentile":0.06634,"ingestedAt":"2026-10-16T19:46:24.382Z","slug":"CVE-2026-74305","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= c1c74584b9b4043c52e41fec415226e582d266a3 < 87177497cca90bf4fcfb759eb898560eb5b46a10`\n- `Linux >= 66da7cee78590259b400e51a70622ccd41da7bb2 < 1c762d28698483ce7c372091f34d86e4d4828652`\n- `Linux >= 7acfa07c585e3d7a64654d38f0a5c762877d0b9b < eb73056ce2a6f101ddd3bdba89af6b24ebffff85`\n- `Linux >= 41688d1fc5d163a6c2c0e95c0419e2cb31a44648 < 9ca06849c4239aa2d580c54651f8588c51cb398b`\n- `Linux >= abad3d0bad72a52137e0c350c59542d75ae4f513 < 46fbafe3d2d569d828e8d24a7dbe1659f63685cf`\n- `Linux >= abad3d0bad72a52137e0c350c59542d75ae4f513 < cb22dc79528eb26a46d346c3118dbd6b14c70609`\n- `Linux >= abad3d0bad72a52137e0c350c59542d75ae4f513 < 10627ddc0167aab5c1c390a10ef461e9937aba08`\n- `Linux 19341d5c59e8c7e8528e40f8663e99d67810473c`\n- `Linux >= 5.15.192 < 5.15.212`\n- `Linux >= 6.1.151 < 6.1.178`\n- `Linux >= 6.6.105 < 6.6.145`\n- `Linux >= 6.12.46 < 6.12.97`\n- `Linux >= 6.16.1 < 6.17`\n- `Linux 6.17`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}