CVE-2022-50546 (GCVE-0-2022-50546)
Vulnerability from cvelistv5
Published
2025-10-07 15:21
Modified
2025-10-07 15:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix uninititialized value in 'ext4_evict_inode' Syzbot found the following issue: ===================================================== BUG: KMSAN: uninit-value in ext4_evict_inode+0xdd/0x26b0 fs/ext4/inode.c:180 ext4_evict_inode+0xdd/0x26b0 fs/ext4/inode.c:180 evict+0x365/0x9a0 fs/inode.c:664 iput_final fs/inode.c:1747 [inline] iput+0x985/0xdd0 fs/inode.c:1773 __ext4_new_inode+0xe54/0x7ec0 fs/ext4/ialloc.c:1361 ext4_mknod+0x376/0x840 fs/ext4/namei.c:2844 vfs_mknod+0x79d/0x830 fs/namei.c:3914 do_mknodat+0x47d/0xaa0 __do_sys_mknodat fs/namei.c:3992 [inline] __se_sys_mknodat fs/namei.c:3989 [inline] __ia32_sys_mknodat+0xeb/0x150 fs/namei.c:3989 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Uninit was created at: __alloc_pages+0x9f1/0xe80 mm/page_alloc.c:5578 alloc_pages+0xaae/0xd80 mm/mempolicy.c:2285 alloc_slab_page mm/slub.c:1794 [inline] allocate_slab+0x1b5/0x1010 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0x10c3/0x2d60 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc_lru+0x6f3/0xb30 mm/slub.c:3429 alloc_inode_sb include/linux/fs.h:3117 [inline] ext4_alloc_inode+0x5f/0x860 fs/ext4/super.c:1321 alloc_inode+0x83/0x440 fs/inode.c:259 new_inode_pseudo fs/inode.c:1018 [inline] new_inode+0x3b/0x430 fs/inode.c:1046 __ext4_new_inode+0x2a7/0x7ec0 fs/ext4/ialloc.c:959 ext4_mkdir+0x4d5/0x1560 fs/ext4/namei.c:2992 vfs_mkdir+0x62a/0x870 fs/namei.c:4035 do_mkdirat+0x466/0x7b0 fs/namei.c:4060 __do_sys_mkdirat fs/namei.c:4075 [inline] __se_sys_mkdirat fs/namei.c:4073 [inline] __ia32_sys_mkdirat+0xc4/0x120 fs/namei.c:4073 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246 entry_SYSENTER_compat_after_hwframe+0x70/0x82 CPU: 1 PID: 4625 Comm: syz-executor.2 Not tainted 6.1.0-rc4-syzkaller-62821-gcb231e2f67ec #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 ===================================================== Now, 'ext4_alloc_inode()' didn't init 'ei->i_flags'. If new inode failed before set 'ei->i_flags' in '__ext4_new_inode()', then do 'iput()'. As after 6bc0d63dad7f commit will access 'ei->i_flags' in 'ext4_evict_inode()' which will lead to access uninit-value. To solve above issue just init 'ei->i_flags' in 'ext4_alloc_inode()'.
References
Impacted products
Vendor Product Version
Linux Linux Version: bb337d8dd1e1d6b7719872e45e36392f3ab14b4f
Version: a5f9bd4beae8553480d02b569d4aabee1b49345d
Version: 0e6fbc566fcc4c230bf80f76cf5df26b42142d8a
Version: 0b885394fd009aa0b46d81b496a816ab11309f8a
Version: 6bc0d63dad7f9f54d381925ee855b402f652fa39
Version: 6bc0d63dad7f9f54d381925ee855b402f652fa39
Version: 6bc0d63dad7f9f54d381925ee855b402f652fa39
Version: 819d16f7feaca0f2ed3409be14fe953127fc51b6
Version: 458aee4a6e5be7ad862ee27dfaf07ce552d84f32
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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            {
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              "version": "819d16f7feaca0f2ed3409be14fe953127fc51b6",
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            },
            {
              "status": "affected",
              "version": "458aee4a6e5be7ad862ee27dfaf07ce552d84f32",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.164",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.87",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.164",
                  "versionStartIncluding": "5.10.163",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.87",
                  "versionStartIncluding": "5.15.61",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.18",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.4",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.18.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.19.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix uninititialized value in \u0027ext4_evict_inode\u0027\n\nSyzbot found the following issue:\n=====================================================\nBUG: KMSAN: uninit-value in ext4_evict_inode+0xdd/0x26b0 fs/ext4/inode.c:180\n ext4_evict_inode+0xdd/0x26b0 fs/ext4/inode.c:180\n evict+0x365/0x9a0 fs/inode.c:664\n iput_final fs/inode.c:1747 [inline]\n iput+0x985/0xdd0 fs/inode.c:1773\n __ext4_new_inode+0xe54/0x7ec0 fs/ext4/ialloc.c:1361\n ext4_mknod+0x376/0x840 fs/ext4/namei.c:2844\n vfs_mknod+0x79d/0x830 fs/namei.c:3914\n do_mknodat+0x47d/0xaa0\n __do_sys_mknodat fs/namei.c:3992 [inline]\n __se_sys_mknodat fs/namei.c:3989 [inline]\n __ia32_sys_mknodat+0xeb/0x150 fs/namei.c:3989\n do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]\n __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178\n do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203\n do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246\n entry_SYSENTER_compat_after_hwframe+0x70/0x82\n\nUninit was created at:\n __alloc_pages+0x9f1/0xe80 mm/page_alloc.c:5578\n alloc_pages+0xaae/0xd80 mm/mempolicy.c:2285\n alloc_slab_page mm/slub.c:1794 [inline]\n allocate_slab+0x1b5/0x1010 mm/slub.c:1939\n new_slab mm/slub.c:1992 [inline]\n ___slab_alloc+0x10c3/0x2d60 mm/slub.c:3180\n __slab_alloc mm/slub.c:3279 [inline]\n slab_alloc_node mm/slub.c:3364 [inline]\n slab_alloc mm/slub.c:3406 [inline]\n __kmem_cache_alloc_lru mm/slub.c:3413 [inline]\n kmem_cache_alloc_lru+0x6f3/0xb30 mm/slub.c:3429\n alloc_inode_sb include/linux/fs.h:3117 [inline]\n ext4_alloc_inode+0x5f/0x860 fs/ext4/super.c:1321\n alloc_inode+0x83/0x440 fs/inode.c:259\n new_inode_pseudo fs/inode.c:1018 [inline]\n new_inode+0x3b/0x430 fs/inode.c:1046\n __ext4_new_inode+0x2a7/0x7ec0 fs/ext4/ialloc.c:959\n ext4_mkdir+0x4d5/0x1560 fs/ext4/namei.c:2992\n vfs_mkdir+0x62a/0x870 fs/namei.c:4035\n do_mkdirat+0x466/0x7b0 fs/namei.c:4060\n __do_sys_mkdirat fs/namei.c:4075 [inline]\n __se_sys_mkdirat fs/namei.c:4073 [inline]\n __ia32_sys_mkdirat+0xc4/0x120 fs/namei.c:4073\n do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]\n __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178\n do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203\n do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246\n entry_SYSENTER_compat_after_hwframe+0x70/0x82\n\nCPU: 1 PID: 4625 Comm: syz-executor.2 Not tainted 6.1.0-rc4-syzkaller-62821-gcb231e2f67ec #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\n=====================================================\n\nNow, \u0027ext4_alloc_inode()\u0027 didn\u0027t init \u0027ei-\u003ei_flags\u0027. If new inode failed\nbefore set \u0027ei-\u003ei_flags\u0027 in \u0027__ext4_new_inode()\u0027, then do \u0027iput()\u0027. As after\n6bc0d63dad7f commit will access \u0027ei-\u003ei_flags\u0027 in \u0027ext4_evict_inode()\u0027 which\nwill lead to access uninit-value.\nTo solve above issue just init \u0027ei-\u003ei_flags\u0027 in \u0027ext4_alloc_inode()\u0027."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-07T15:21:09.963Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f0bffdcc7cb14598af2aa706f1e0f2a9054154ba"
        },
        {
          "url": "https://git.kernel.org/stable/c/e431b4fb1fb8c2654b808086e9747a000adb9655"
        },
        {
          "url": "https://git.kernel.org/stable/c/091f85db4c3fb1734a6d7fb4777a2b2831da6631"
        },
        {
          "url": "https://git.kernel.org/stable/c/3c31d8d3ad95aef8cc17a4fcf317e46217148439"
        },
        {
          "url": "https://git.kernel.org/stable/c/56491d60ddca9c697d885394cb0173675b9ab81f"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f966e021c20caae639dd0e404c8761e8281a2c4"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ea71af94eaaaf6d9aed24bc94a05b977a741cb9"
        }
      ],
      "title": "ext4: fix uninititialized value in \u0027ext4_evict_inode\u0027",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50546",
    "datePublished": "2025-10-07T15:21:09.963Z",
    "dateReserved": "2025-10-07T15:15:38.667Z",
    "dateUpdated": "2025-10-07T15:21:09.963Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50546\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-07T16:15:39.147\",\"lastModified\":\"2025-10-08T19:38:32.610\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix uninititialized value in \u0027ext4_evict_inode\u0027\\n\\nSyzbot found the following issue:\\n=====================================================\\nBUG: KMSAN: uninit-value in ext4_evict_inode+0xdd/0x26b0 fs/ext4/inode.c:180\\n ext4_evict_inode+0xdd/0x26b0 fs/ext4/inode.c:180\\n evict+0x365/0x9a0 fs/inode.c:664\\n iput_final fs/inode.c:1747 [inline]\\n iput+0x985/0xdd0 fs/inode.c:1773\\n __ext4_new_inode+0xe54/0x7ec0 fs/ext4/ialloc.c:1361\\n ext4_mknod+0x376/0x840 fs/ext4/namei.c:2844\\n vfs_mknod+0x79d/0x830 fs/namei.c:3914\\n do_mknodat+0x47d/0xaa0\\n __do_sys_mknodat fs/namei.c:3992 [inline]\\n __se_sys_mknodat fs/namei.c:3989 [inline]\\n __ia32_sys_mknodat+0xeb/0x150 fs/namei.c:3989\\n do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]\\n __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178\\n do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203\\n do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246\\n entry_SYSENTER_compat_after_hwframe+0x70/0x82\\n\\nUninit was created at:\\n __alloc_pages+0x9f1/0xe80 mm/page_alloc.c:5578\\n alloc_pages+0xaae/0xd80 mm/mempolicy.c:2285\\n alloc_slab_page mm/slub.c:1794 [inline]\\n allocate_slab+0x1b5/0x1010 mm/slub.c:1939\\n new_slab mm/slub.c:1992 [inline]\\n ___slab_alloc+0x10c3/0x2d60 mm/slub.c:3180\\n __slab_alloc mm/slub.c:3279 [inline]\\n slab_alloc_node mm/slub.c:3364 [inline]\\n slab_alloc mm/slub.c:3406 [inline]\\n __kmem_cache_alloc_lru mm/slub.c:3413 [inline]\\n kmem_cache_alloc_lru+0x6f3/0xb30 mm/slub.c:3429\\n alloc_inode_sb include/linux/fs.h:3117 [inline]\\n ext4_alloc_inode+0x5f/0x860 fs/ext4/super.c:1321\\n alloc_inode+0x83/0x440 fs/inode.c:259\\n new_inode_pseudo fs/inode.c:1018 [inline]\\n new_inode+0x3b/0x430 fs/inode.c:1046\\n __ext4_new_inode+0x2a7/0x7ec0 fs/ext4/ialloc.c:959\\n ext4_mkdir+0x4d5/0x1560 fs/ext4/namei.c:2992\\n vfs_mkdir+0x62a/0x870 fs/namei.c:4035\\n do_mkdirat+0x466/0x7b0 fs/namei.c:4060\\n __do_sys_mkdirat fs/namei.c:4075 [inline]\\n __se_sys_mkdirat fs/namei.c:4073 [inline]\\n __ia32_sys_mkdirat+0xc4/0x120 fs/namei.c:4073\\n do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]\\n __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178\\n do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203\\n do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:246\\n entry_SYSENTER_compat_after_hwframe+0x70/0x82\\n\\nCPU: 1 PID: 4625 Comm: syz-executor.2 Not tainted 6.1.0-rc4-syzkaller-62821-gcb231e2f67ec #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\\n=====================================================\\n\\nNow, \u0027ext4_alloc_inode()\u0027 didn\u0027t init \u0027ei-\u003ei_flags\u0027. If new inode failed\\nbefore set \u0027ei-\u003ei_flags\u0027 in \u0027__ext4_new_inode()\u0027, then do \u0027iput()\u0027. As after\\n6bc0d63dad7f commit will access \u0027ei-\u003ei_flags\u0027 in \u0027ext4_evict_inode()\u0027 which\\nwill lead to access uninit-value.\\nTo solve above issue just init \u0027ei-\u003ei_flags\u0027 in \u0027ext4_alloc_inode()\u0027.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/091f85db4c3fb1734a6d7fb4777a2b2831da6631\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3c31d8d3ad95aef8cc17a4fcf317e46217148439\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/56491d60ddca9c697d885394cb0173675b9ab81f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7ea71af94eaaaf6d9aed24bc94a05b977a741cb9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f966e021c20caae639dd0e404c8761e8281a2c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e431b4fb1fb8c2654b808086e9747a000adb9655\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f0bffdcc7cb14598af2aa706f1e0f2a9054154ba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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