CVE-2026-68187 (GCVE-0-2026-68187)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:59 – Updated: 2026-08-19 16:30
VLAI
Title
exec: fix unsigned loop counter wrap in transfer_args_to_stack()
Summary
In the Linux kernel, the following vulnerability has been resolved: exec: fix unsigned loop counter wrap in transfer_args_to_stack() The stop value is derived from bprm->p >> PAGE_SHIFT. The index variable is an unsigned long. If bprm->p drops below PAGE_SIZE and stop becomes zero the loop condition index >= stop is always true. After the index == 0 iteration the decrement wraps to ULONG_MAX and bprm->page[ULONG_MAX] reads sizeof(void *) bytes in front of the array. The pointer has wrapped to -1. That garbage pointer is then passed to kmap_local_page() and PAGE_SIZE bytes are copied from wherever that lands into the stack of the process being created. And the loop doesn't terminate either... Getting there only requires bprm->p < PAGE_SIZE. On !MMU bprm_set_stack_limit() and bprm_hit_stack_limit() are empty. So the only constraint on how far bprm->p is pushed down is valid_arg_len(), i.e. that each individual string still fits in what is left. bprm->p starts at PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *) so a single argument or environment string of a little over 31 pages leaves it in the first page: Oops - load access fault [#1] CPU: 0 UID: 0 PID: 1 Comm: victim Not tainted 7.2.0-rc4 #1 epc : __memcpy+0xd4/0xf8 ra : transfer_args_to_stack+0xaa/0xae s4 : ffffffffffffffff s2 : 0000000000000000 a1 : ffffffdc98000000 a2 : 0000000000001000 status: 0000000a00001880 badaddr: ffffffdc98000000 cause: 0000000000000005 [<801a5324>] __memcpy+0xd4/0xf8 [<800d5f6a>] load_flat_binary+0x43a/0x65e [<800a2de4>] bprm_execve+0x1d4/0x316 [<800a351a>] do_execveat_common+0x12e/0x138 [<800a3d44>] __riscv_sys_execve+0x38/0x4e Kernel panic - not syncing: Fatal exception in interrupt This is an arcane bug but we should still fix it. Count down from MAX_ARG_PAGES so the loop ends when index reaches stop, stop == 0 included. The iterations performed are unchanged for every other value of stop. Only CONFIG_MMU=n builds are affected, transfer_args_to_stack() is used by binfmt_flat and binfmt_elf_fdpic on nommu only. The loop predates git history. commit 7e7ec6a93434 ("elf_fdpic_transfer_args_to_stack(): make it generic") only moved it from binfmt_elf_fdpic.c into fs/exec.c and narrowed the copy to the used part of the first page. The condition and the decrement are unchanged from 2.6.12-rc2.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a9eb5c4949008034909bc34ecfa0843ecc1d0ab3 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 67cf5cdad823afb0530d6d0341fbf4ca07e93a09 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 66e20942890a383eb39b2009a2ceb4c2ebec37ef (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c62bb00caba66e01fb578d5f0302f247dc64930a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < dfc2a00742af4cb7251c1a8fbce4fbae3cc0de4e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2bc6bf70d41055377f390d06f0f3521deb62fd3b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 55fa2c7f2b15583d1a2fe1b5abcc24377359339f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 16cc4f5c1c4b9e45eca7f7deefa5410a292db599 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nexec: fix unsigned loop counter wrap in transfer_args_to_stack()\n\nThe stop value is derived from bprm-\u003ep \u003e\u003e PAGE_SHIFT. The index variable\nis an unsigned long. If bprm-\u003ep drops below PAGE_SIZE and stop becomes\nzero the loop condition index \u003e= stop is always true.\n\nAfter the index == 0 iteration the decrement wraps to ULONG_MAX and\nbprm-\u003epage[ULONG_MAX] reads sizeof(void *) bytes in front of the array.\nThe pointer has wrapped to -1. That garbage pointer is then passed to\nkmap_local_page() and PAGE_SIZE bytes are copied from wherever that\nlands into the stack of the process being created. And the loop doesn\u0027t\nterminate either...\n\nGetting there only requires bprm-\u003ep \u003c PAGE_SIZE. On !MMU\nbprm_set_stack_limit() and bprm_hit_stack_limit() are empty. So the only\nconstraint on how far bprm-\u003ep is pushed down is valid_arg_len(), i.e.\nthat each individual string still fits in what is left.\n\nbprm-\u003ep starts at PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *) so a\nsingle argument or environment string of a little over 31 pages leaves\nit in the first page:\n\n  Oops - load access fault [#1]\n  CPU: 0 UID: 0 PID: 1 Comm: victim Not tainted 7.2.0-rc4 #1\n  epc : __memcpy+0xd4/0xf8\n   ra : transfer_args_to_stack+0xaa/0xae\n   s4 : ffffffffffffffff   s2 : 0000000000000000\n   a1 : ffffffdc98000000   a2 : 0000000000001000\n  status: 0000000a00001880 badaddr: ffffffdc98000000 cause: 0000000000000005\n  [\u003c801a5324\u003e] __memcpy+0xd4/0xf8\n  [\u003c800d5f6a\u003e] load_flat_binary+0x43a/0x65e\n  [\u003c800a2de4\u003e] bprm_execve+0x1d4/0x316\n  [\u003c800a351a\u003e] do_execveat_common+0x12e/0x138\n  [\u003c800a3d44\u003e] __riscv_sys_execve+0x38/0x4e\n  Kernel panic - not syncing: Fatal exception in interrupt\n\nThis is an arcane bug but we should still fix it.\n\nCount down from MAX_ARG_PAGES so the loop ends when index reaches stop,\nstop == 0 included. The iterations performed are unchanged for every\nother value of stop.\n\nOnly CONFIG_MMU=n builds are affected, transfer_args_to_stack() is used\nby binfmt_flat and binfmt_elf_fdpic on nommu only.\n\nThe loop predates git history. commit 7e7ec6a93434\n(\"elf_fdpic_transfer_args_to_stack(): make it generic\") only moved it\nfrom binfmt_elf_fdpic.c into fs/exec.c and narrowed the copy to the used\npart of the first page. The condition and the decrement are unchanged\nfrom 2.6.12-rc2."
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        "dateUpdated": "2026-08-19T16:30:56.724Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "title": "exec: fix unsigned loop counter wrap in transfer_args_to_stack()",
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    "cveId": "CVE-2026-68187",
    "datePublished": "2026-08-10T11:59:59.303Z",
    "dateReserved": "2026-07-30T09:28:09.373Z",
    "dateUpdated": "2026-08-19T16:30:56.724Z",
    "state": "PUBLISHED"
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That garbage pointer is then passed to\\nkmap_local_page() and PAGE_SIZE bytes are copied from wherever that\\nlands into the stack of the process being created. And the loop doesn\u0027t\\nterminate either...\\n\\nGetting there only requires bprm-\u003ep \u003c PAGE_SIZE. On !MMU\\nbprm_set_stack_limit() and bprm_hit_stack_limit() are empty. So the only\\nconstraint on how far bprm-\u003ep is pushed down is valid_arg_len(), i.e.\\nthat each individual string still fits in what is left.\\n\\nbprm-\u003ep starts at PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *) so a\\nsingle argument or environment string of a little over 31 pages leaves\\nit in the first page:\\n\\n  Oops - load access fault [#1]\\n  CPU: 0 UID: 0 PID: 1 Comm: victim Not tainted 7.2.0-rc4 #1\\n  epc : __memcpy+0xd4/0xf8\\n   ra : transfer_args_to_stack+0xaa/0xae\\n   s4 : ffffffffffffffff   s2 : 0000000000000000\\n   a1 : ffffffdc98000000   a2 : 0000000000001000\\n  status: 0000000a00001880 badaddr: ffffffdc98000000 cause: 0000000000000005\\n  [\u003c801a5324\u003e] __memcpy+0xd4/0xf8\\n  [\u003c800d5f6a\u003e] load_flat_binary+0x43a/0x65e\\n  [\u003c800a2de4\u003e] bprm_execve+0x1d4/0x316\\n  [\u003c800a351a\u003e] do_execveat_common+0x12e/0x138\\n  [\u003c800a3d44\u003e] __riscv_sys_execve+0x38/0x4e\\n  Kernel panic - not syncing: Fatal exception in interrupt\\n\\nThis is an arcane bug but we should still fix it.\\n\\nCount down from MAX_ARG_PAGES so the loop ends when index reaches stop,\\nstop == 0 included. The iterations performed are unchanged for every\\nother value of stop.\\n\\nOnly CONFIG_MMU=n builds are affected, transfer_args_to_stack() is used\\nby binfmt_flat and binfmt_elf_fdpic on nommu only.\\n\\nThe loop predates git history. commit 7e7ec6a93434\\n(\\\"elf_fdpic_transfer_args_to_stack(): make it generic\\\") only moved it\\nfrom binfmt_elf_fdpic.c into fs/exec.c and narrowed the copy to the used\\npart of the first page. The condition and the decrement are unchanged\\nfrom 2.6.12-rc2.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/exec.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"a9eb5c4949008034909bc34ecfa0843ecc1d0ab3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"67cf5cdad823afb0530d6d0341fbf4ca07e93a09\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"66e20942890a383eb39b2009a2ceb4c2ebec37ef\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"c62bb00caba66e01fb578d5f0302f247dc64930a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"dfc2a00742af4cb7251c1a8fbce4fbae3cc0de4e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"2bc6bf70d41055377f390d06f0f3521deb62fd3b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"55fa2c7f2b15583d1a2fe1b5abcc24377359339f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"16cc4f5c1c4b9e45eca7f7deefa5410a292db599\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/exec.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/16cc4f5c1c4b9e45eca7f7deefa5410a292db599\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2bc6bf70d41055377f390d06f0f3521deb62fd3b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/55fa2c7f2b15583d1a2fe1b5abcc24377359339f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/66e20942890a383eb39b2009a2ceb4c2ebec37ef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/67cf5cdad823afb0530d6d0341fbf4ca07e93a09\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a9eb5c4949008034909bc34ecfa0843ecc1d0ab3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c62bb00caba66e01fb578d5f0302f247dc64930a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dfc2a00742af4cb7251c1a8fbce4fbae3cc0de4e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-13T22:52:44+00:00",
      "cve": "CVE-2026-68187",
      "id": "CVE-2026-68187",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "275",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: exec: fix unsigned loop counter wrap in transfer_args_to_stack()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68187.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-14T23:45:43Z",
      "cve": "CVE-2026-68187",
      "id": "CVE-2026-68187",
      "initial_release_date": "2026-08-14T23:45:43Z",
      "product_status:known_affected": "290",
      "product_status:known_not_affected": "6",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68187",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68187.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.