{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "858cf3a8c59968e7c5f7c1a1192459a0d52d1ab4"
            },
            {
              "fixed": "feb5c87c8514444ba891b75a5a3eae57c64edaf8"
            },
            {
              "fixed": "384628d6cdde0fcd76868606fad3ad8293100afb"
            },
            {
              "fixed": "1fafc4d9b411645eb34de43362b966dc8fb3e263"
            },
            {
              "fixed": "cff8281bacd2866767e6194c3079d33b6c5a74f4"
            },
            {
              "fixed": "edf6babb9edd2d3e19229ade339081f439d4f478"
            },
            {
              "fixed": "ea6a188ee805e841a0e242f14d15953e0dfa74bb"
            },
            {
              "fixed": "571e1f10b5996ba3e4dc63ea77de4aa309c384ce"
            },
            {
              "fixed": "26aff38fefb1d6cd87e22525f41cc8f1aa61b24f"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.11.0"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72068.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nposix-cpu-timers: Use u64 multiplication in update_rlimit_cpu()\n\nupdate_rlimit_cpu() converts the RLIMIT_CPU value to nanoseconds with\n\n        u64 nsecs = rlim_new * NSEC_PER_SEC;\n\nOn 32-bit kernels both rlim_new (unsigned long) and NSEC_PER_SEC\n(1000000000L) are 32-bit, so the multiplication is performed in unsigned\nlong and truncated for rlim_new \u003e 4 seconds before being widened to u64.\n\nThe same file already casts to u64 for the matching computation in\ncheck_process_timers():\n\n        u64 softns = (u64)soft * NSEC_PER_SEC;\n\nAs a result, the truncated value is installed into the CPUCLOCK_PROF\nexpiry cache (nextevt), causing the process CPU timer to be programmed\nto fire prematurely for any RLIMIT_CPU soft limit \u003e= 5 seconds. The\nactual SIGXCPU/SIGKILL decision in check_process_timers() already casts\nto u64 and is therefore correct, so limit enforcement is not broken;\nonly the expiry-cache programming is wrong. Apply the same cast here so\nboth paths convert rlim_cur identically.\n\n64-bit kernels are unaffected.",
  "id": "CVE-2026-72068",
  "modified": "2026-08-18T03:30:54.814091706Z",
  "published": "2026-08-15T05:52:21.007Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1fafc4d9b411645eb34de43362b966dc8fb3e263"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/26aff38fefb1d6cd87e22525f41cc8f1aa61b24f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/384628d6cdde0fcd76868606fad3ad8293100afb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/571e1f10b5996ba3e4dc63ea77de4aa309c384ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cff8281bacd2866767e6194c3079d33b6c5a74f4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea6a188ee805e841a0e242f14d15953e0dfa74bb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/edf6babb9edd2d3e19229ade339081f439d4f478"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/feb5c87c8514444ba891b75a5a3eae57c64edaf8"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72068.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72068"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "posix-cpu-timers: Use u64 multiplication in update_rlimit_cpu()"
}