CVE-2022-49707 (GCVE-0-2022-49707)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:24 – Updated: 2025-12-23 13:25
VLAI?
Title
ext4: add reserved GDT blocks check
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: add reserved GDT blocks check We capture a NULL pointer issue when resizing a corrupt ext4 image which is freshly clear resize_inode feature (not run e2fsck). It could be simply reproduced by following steps. The problem is because of the resize_inode feature was cleared, and it will convert the filesystem to meta_bg mode in ext4_resize_fs(), but the es->s_reserved_gdt_blocks was not reduced to zero, so could we mistakenly call reserve_backup_gdb() and passing an uninitialized resize_inode to it when adding new group descriptors. mkfs.ext4 /dev/sda 3G tune2fs -O ^resize_inode /dev/sda #forget to run requested e2fsck mount /dev/sda /mnt resize2fs /dev/sda 8G ======== BUG: kernel NULL pointer dereference, address: 0000000000000028 CPU: 19 PID: 3243 Comm: resize2fs Not tainted 5.18.0-rc7-00001-gfde086c5ebfd #748 ... RIP: 0010:ext4_flex_group_add+0xe08/0x2570 ... Call Trace: <TASK> ext4_resize_fs+0xbec/0x1660 __ext4_ioctl+0x1749/0x24e0 ext4_ioctl+0x12/0x20 __x64_sys_ioctl+0xa6/0x110 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f2dd739617b ======== The fix is simple, add a check in ext4_resize_begin() to make sure that the es->s_reserved_gdt_blocks is zero when the resize_inode feature is disabled.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 , < 0dc2fca8e4f9ac4a40e8424a10163369cca0cc06 (git)
Affected: 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 , < 7c921328ac760bba780bdace41f4cd045f7f1405 (git)
Affected: 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 , < b9747263b13e5290ac4d63bec47e38f701303cad (git)
Affected: 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 , < fba54289176702a7caac0b64738406775817f451 (git)
Affected: 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 , < bfd004a1d3a062aac300523d406ac1f3e5f1a82c (git)
Affected: 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 , < 33b1bba31f4c784d33d2c2517964bdccdc9204cd (git)
Affected: 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 , < af75c481a2e45e70f62f5942c93695e95bf7bd21 (git)
Affected: 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 , < b55c3cd102a6f48b90e61c44f7f3dda8c290c694 (git)
Create a notification for this product.
    Linux Linux Affected: 3.7
Unaffected: 0 , < 3.7 (semver)
Unaffected: 4.9.320 , ≤ 4.9.* (semver)
Unaffected: 4.14.285 , ≤ 4.14.* (semver)
Unaffected: 4.19.249 , ≤ 4.19.* (semver)
Unaffected: 5.4.200 , ≤ 5.4.* (semver)
Unaffected: 5.10.124 , ≤ 5.10.* (semver)
Unaffected: 5.15.49 , ≤ 5.15.* (semver)
Unaffected: 5.18.6 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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\"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: add reserved GDT blocks check\\n\\nWe capture a NULL pointer issue when resizing a corrupt ext4 image which\\nis freshly clear resize_inode feature (not run e2fsck). It could be\\nsimply reproduced by following steps. The problem is because of the\\nresize_inode feature was cleared, and it will convert the filesystem to\\nmeta_bg mode in ext4_resize_fs(), but the es-\u003es_reserved_gdt_blocks was\\nnot reduced to zero, so could we mistakenly call reserve_backup_gdb()\\nand passing an uninitialized resize_inode to it when adding new group\\ndescriptors.\\n\\n mkfs.ext4 /dev/sda 3G\\n tune2fs -O ^resize_inode /dev/sda #forget to run requested e2fsck\\n mount /dev/sda /mnt\\n resize2fs /dev/sda 8G\\n\\n ========\\n BUG: kernel NULL pointer dereference, address: 0000000000000028\\n CPU: 19 PID: 3243 Comm: resize2fs Not tainted 5.18.0-rc7-00001-gfde086c5ebfd #748\\n ...\\n RIP: 0010:ext4_flex_group_add+0xe08/0x2570\\n ...\\n Call Trace:\\n  \u003cTASK\u003e\\n  ext4_resize_fs+0xbec/0x1660\\n  __ext4_ioctl+0x1749/0x24e0\\n  ext4_ioctl+0x12/0x20\\n  __x64_sys_ioctl+0xa6/0x110\\n  do_syscall_64+0x3b/0x90\\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\\n RIP: 0033:0x7f2dd739617b\\n ========\\n\\nThe fix is simple, add a check in ext4_resize_begin() to make sure that\\nthe es-\u003es_reserved_gdt_blocks is zero when the resize_inode feature is\\ndisabled.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.320\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.285\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.249\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.200\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.124\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.49\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18.6\", \"versionStartIncluding\": \"3.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19\", \"versionStartIncluding\": \"3.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-12-23T13:25:08.007Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49707\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-23T13:25:08.007Z\", \"dateReserved\": \"2025-02-26T02:21:30.444Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T02:24:25.441Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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Detection rules are retrieved from Rulezet.