CVE-2026-31654 (GCVE-0-2026-31654)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:45 – Updated: 2026-04-24 14:45
VLAI?
Title
mm/vma: fix memory leak in __mmap_region()
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/vma: fix memory leak in __mmap_region() commit 605f6586ecf7 ("mm/vma: do not leak memory when .mmap_prepare swaps the file") handled the success path by skipping get_file() via file_doesnt_need_get, but missed the error path. When /dev/zero is mmap'd with MAP_SHARED, mmap_zero_prepare() calls shmem_zero_setup_desc() which allocates a new shmem file to back the mapping. If __mmap_new_vma() subsequently fails, this replacement file is never fput()'d - the original is released by ksys_mmap_pgoff(), but nobody releases the new one. Add fput() for the swapped file in the error path. Reproducible with fault injection. FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 2 UID: 0 PID: 366 Comm: syz.7.14 Not tainted 7.0.0-rc6 #2 PREEMPT(full) Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x164/0x1f0 should_fail_ex+0x525/0x650 should_failslab+0xdf/0x140 kmem_cache_alloc_noprof+0x78/0x630 vm_area_alloc+0x24/0x160 __mmap_region+0xf6b/0x2660 mmap_region+0x2eb/0x3a0 do_mmap+0xc79/0x1240 vm_mmap_pgoff+0x252/0x4c0 ksys_mmap_pgoff+0xf8/0x120 __x64_sys_mmap+0x12a/0x190 do_syscall_64+0xa9/0x580 entry_SYSCALL_64_after_hwframe+0x76/0x7e </TASK> kmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak) BUG: memory leak unreferenced object 0xffff8881118aca80 (size 360): comm "syz.7.14", pid 366, jiffies 4294913255 hex dump (first 32 bytes): 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N.......... ff ff ff ff ff ff ff ff c0 28 4d ae ff ff ff ff .........(M..... backtrace (crc db0f53bc): kmem_cache_alloc_noprof+0x3ab/0x630 alloc_empty_file+0x5a/0x1e0 alloc_file_pseudo+0x135/0x220 __shmem_file_setup+0x274/0x420 shmem_zero_setup_desc+0x9c/0x170 mmap_zero_prepare+0x123/0x140 __mmap_region+0xdda/0x2660 mmap_region+0x2eb/0x3a0 do_mmap+0xc79/0x1240 vm_mmap_pgoff+0x252/0x4c0 ksys_mmap_pgoff+0xf8/0x120 __x64_sys_mmap+0x12a/0x190 do_syscall_64+0xa9/0x580 entry_SYSCALL_64_after_hwframe+0x76/0x7e Found by syzkaller.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 605f6586ecf78395f0185ab24c368fb46a06e434 , < 61fc8eaf2ab214b32c7bce52597c80cf0ca41ada (git)
Affected: 605f6586ecf78395f0185ab24c368fb46a06e434 , < 894f99eb535edc4514f756818f3c4f688ba53a59 (git)
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    Linux Linux Affected: 6.19
Unaffected: 0 , < 6.19 (semver)
Unaffected: 6.19.13 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/vma.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "semver"
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.13",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.19",
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/vma: fix memory leak in __mmap_region()\n\ncommit 605f6586ecf7 (\"mm/vma: do not leak memory when .mmap_prepare\nswaps the file\") handled the success path by skipping get_file() via\nfile_doesnt_need_get, but missed the error path.\n\nWhen /dev/zero is mmap\u0027d with MAP_SHARED, mmap_zero_prepare() calls\nshmem_zero_setup_desc() which allocates a new shmem file to back the\nmapping. If __mmap_new_vma() subsequently fails, this replacement\nfile is never fput()\u0027d - the original is released by\nksys_mmap_pgoff(), but nobody releases the new one.\n\nAdd fput() for the swapped file in the error path.\n\nReproducible with fault injection.\n\nFAULT_INJECTION: forcing a failure.\nname failslab, interval 1, probability 0, space 0, times 1\nCPU: 2 UID: 0 PID: 366 Comm: syz.7.14 Not tainted 7.0.0-rc6 #2 PREEMPT(full)\nHardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x164/0x1f0\n should_fail_ex+0x525/0x650\n should_failslab+0xdf/0x140\n kmem_cache_alloc_noprof+0x78/0x630\n vm_area_alloc+0x24/0x160\n __mmap_region+0xf6b/0x2660\n mmap_region+0x2eb/0x3a0\n do_mmap+0xc79/0x1240\n vm_mmap_pgoff+0x252/0x4c0\n ksys_mmap_pgoff+0xf8/0x120\n __x64_sys_mmap+0x12a/0x190\n do_syscall_64+0xa9/0x580\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n \u003c/TASK\u003e\n\nkmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\nBUG: memory leak\nunreferenced object 0xffff8881118aca80 (size 360):\n  comm \"syz.7.14\", pid 366, jiffies 4294913255\n  hex dump (first 32 bytes):\n    00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00  .....N..........\n    ff ff ff ff ff ff ff ff c0 28 4d ae ff ff ff ff  .........(M.....\n  backtrace (crc db0f53bc):\n    kmem_cache_alloc_noprof+0x3ab/0x630\n    alloc_empty_file+0x5a/0x1e0\n    alloc_file_pseudo+0x135/0x220\n    __shmem_file_setup+0x274/0x420\n    shmem_zero_setup_desc+0x9c/0x170\n    mmap_zero_prepare+0x123/0x140\n    __mmap_region+0xdda/0x2660\n    mmap_region+0x2eb/0x3a0\n    do_mmap+0xc79/0x1240\n    vm_mmap_pgoff+0x252/0x4c0\n    ksys_mmap_pgoff+0xf8/0x120\n    __x64_sys_mmap+0x12a/0x190\n    do_syscall_64+0xa9/0x580\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nFound by syzkaller."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-24T14:45:06.387Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/61fc8eaf2ab214b32c7bce52597c80cf0ca41ada"
        },
        {
          "url": "https://git.kernel.org/stable/c/894f99eb535edc4514f756818f3c4f688ba53a59"
        }
      ],
      "title": "mm/vma: fix memory leak in __mmap_region()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31654",
    "datePublished": "2026-04-24T14:45:06.387Z",
    "dateReserved": "2026-03-09T15:48:24.129Z",
    "dateUpdated": "2026-04-24T14:45:06.387Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-31654",
      "date": "2026-04-25",
      "epss": "0.00018",
      "percentile": "0.04987"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31654\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-24T15:16:44.890\",\"lastModified\":\"2026-04-24T17:51:40.810\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm/vma: fix memory leak in __mmap_region()\\n\\ncommit 605f6586ecf7 (\\\"mm/vma: do not leak memory when .mmap_prepare\\nswaps the file\\\") handled the success path by skipping get_file() via\\nfile_doesnt_need_get, but missed the error path.\\n\\nWhen /dev/zero is mmap\u0027d with MAP_SHARED, mmap_zero_prepare() calls\\nshmem_zero_setup_desc() which allocates a new shmem file to back the\\nmapping. If __mmap_new_vma() subsequently fails, this replacement\\nfile is never fput()\u0027d - the original is released by\\nksys_mmap_pgoff(), but nobody releases the new one.\\n\\nAdd fput() for the swapped file in the error path.\\n\\nReproducible with fault injection.\\n\\nFAULT_INJECTION: forcing a failure.\\nname failslab, interval 1, probability 0, space 0, times 1\\nCPU: 2 UID: 0 PID: 366 Comm: syz.7.14 Not tainted 7.0.0-rc6 #2 PREEMPT(full)\\nHardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\nCall Trace:\\n \u003cTASK\u003e\\n dump_stack_lvl+0x164/0x1f0\\n should_fail_ex+0x525/0x650\\n should_failslab+0xdf/0x140\\n kmem_cache_alloc_noprof+0x78/0x630\\n vm_area_alloc+0x24/0x160\\n __mmap_region+0xf6b/0x2660\\n mmap_region+0x2eb/0x3a0\\n do_mmap+0xc79/0x1240\\n vm_mmap_pgoff+0x252/0x4c0\\n ksys_mmap_pgoff+0xf8/0x120\\n __x64_sys_mmap+0x12a/0x190\\n do_syscall_64+0xa9/0x580\\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n \u003c/TASK\u003e\\n\\nkmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\\nBUG: memory leak\\nunreferenced object 0xffff8881118aca80 (size 360):\\n  comm \\\"syz.7.14\\\", pid 366, jiffies 4294913255\\n  hex dump (first 32 bytes):\\n    00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00  .....N..........\\n    ff ff ff ff ff ff ff ff c0 28 4d ae ff ff ff ff  .........(M.....\\n  backtrace (crc db0f53bc):\\n    kmem_cache_alloc_noprof+0x3ab/0x630\\n    alloc_empty_file+0x5a/0x1e0\\n    alloc_file_pseudo+0x135/0x220\\n    __shmem_file_setup+0x274/0x420\\n    shmem_zero_setup_desc+0x9c/0x170\\n    mmap_zero_prepare+0x123/0x140\\n    __mmap_region+0xdda/0x2660\\n    mmap_region+0x2eb/0x3a0\\n    do_mmap+0xc79/0x1240\\n    vm_mmap_pgoff+0x252/0x4c0\\n    ksys_mmap_pgoff+0xf8/0x120\\n    __x64_sys_mmap+0x12a/0x190\\n    do_syscall_64+0xa9/0x580\\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\nFound by syzkaller.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/61fc8eaf2ab214b32c7bce52597c80cf0ca41ada\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/894f99eb535edc4514f756818f3c4f688ba53a59\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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