{"id":"CVE-2022-49707","state":"PUBLISHED","title":"ext4: add reserved GDT blocks check","description":"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->s_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  <TASK>\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->s_reserved_gdt_blocks is zero when the resize_inode feature is\ndisabled.","publishedAt":"2025-02-26T02:24:25.441Z","updatedAt":"2026-05-11T19:05:11.366Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"0dc2fca8e4f9ac4a40e8424a10163369cca0cc06","versionType":"git"},{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"7c921328ac760bba780bdace41f4cd045f7f1405","versionType":"git"},{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"b9747263b13e5290ac4d63bec47e38f701303cad","versionType":"git"},{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"fba54289176702a7caac0b64738406775817f451","versionType":"git"},{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"bfd004a1d3a062aac300523d406ac1f3e5f1a82c","versionType":"git"},{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"33b1bba31f4c784d33d2c2517964bdccdc9204cd","versionType":"git"},{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"af75c481a2e45e70f62f5942c93695e95bf7bd21","versionType":"git"},{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"b55c3cd102a6f48b90e61c44f7f3dda8c290c694","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/resize.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.7","versionType":"semver"},{"version":"4.9.320","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.285","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.249","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.200","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.124","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.49","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.18.6","status":"unaffected","lessThanOrEqual":"5.18.*","versionType":"semver"},{"version":"5.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/resize.c"]}],"references":["https://git.kernel.org/stable/c/0dc2fca8e4f9ac4a40e8424a10163369cca0cc06","https://git.kernel.org/stable/c/7c921328ac760bba780bdace41f4cd045f7f1405","https://git.kernel.org/stable/c/b9747263b13e5290ac4d63bec47e38f701303cad","https://git.kernel.org/stable/c/fba54289176702a7caac0b64738406775817f451","https://git.kernel.org/stable/c/bfd004a1d3a062aac300523d406ac1f3e5f1a82c","https://git.kernel.org/stable/c/33b1bba31f4c784d33d2c2517964bdccdc9204cd","https://git.kernel.org/stable/c/af75c481a2e45e70f62f5942c93695e95bf7bd21","https://git.kernel.org/stable/c/b55c3cd102a6f48b90e61c44f7f3dda8c290c694"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/49xxx/CVE-2022-49707.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49707","state":"PUBLISHED","datePublished":"2025-02-26T02:24:25.441Z","dateUpdated":"2026-05-11T19:05:11.366Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-02-26T02:21:30.444Z"},"containers":{"cna":{"title":"ext4: add reserved GDT blocks check","descriptions":[{"lang":"en","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->s_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  <TASK>\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->s_reserved_gdt_blocks is zero when the resize_inode feature is\ndisabled."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"0dc2fca8e4f9ac4a40e8424a10163369cca0cc06","versionType":"git"},{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"7c921328ac760bba780bdace41f4cd045f7f1405","versionType":"git"},{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"b9747263b13e5290ac4d63bec47e38f701303cad","versionType":"git"},{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"fba54289176702a7caac0b64738406775817f451","versionType":"git"},{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"bfd004a1d3a062aac300523d406ac1f3e5f1a82c","versionType":"git"},{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"33b1bba31f4c784d33d2c2517964bdccdc9204cd","versionType":"git"},{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"af75c481a2e45e70f62f5942c93695e95bf7bd21","versionType":"git"},{"version":"1c6bd7173d66b3dfdefcedb38cabc1fb03997509","status":"affected","lessThan":"b55c3cd102a6f48b90e61c44f7f3dda8c290c694","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/resize.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.7","versionType":"semver"},{"version":"4.9.320","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.285","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.249","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.200","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.124","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.49","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.18.6","status":"unaffected","lessThanOrEqual":"5.18.*","versionType":"semver"},{"version":"5.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ext4/resize.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0dc2fca8e4f9ac4a40e8424a10163369cca0cc06"},{"url":"https://git.kernel.org/stable/c/7c921328ac760bba780bdace41f4cd045f7f1405"},{"url":"https://git.kernel.org/stable/c/b9747263b13e5290ac4d63bec47e38f701303cad"},{"url":"https://git.kernel.org/stable/c/fba54289176702a7caac0b64738406775817f451"},{"url":"https://git.kernel.org/stable/c/bfd004a1d3a062aac300523d406ac1f3e5f1a82c"},{"url":"https://git.kernel.org/stable/c/33b1bba31f4c784d33d2c2517964bdccdc9204cd"},{"url":"https://git.kernel.org/stable/c/af75c481a2e45e70f62f5942c93695e95bf7bd21"},{"url":"https://git.kernel.org/stable/c/b55c3cd102a6f48b90e61c44f7f3dda8c290c694"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:05:11.366Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"4.9.320"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"4.14.285"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"4.19.249"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"5.4.200"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"5.10.124"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"5.15.49"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"5.18.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"5.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"id":"CVE-2022-49707","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2025-10-01T19:32:29.329505Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","type":"CWE","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-01T19:36:45.352Z"}}]}}}