CVE-2022-49707 (GCVE-0-2022-49707)
Vulnerability from cvelistv5 – Published: 2025-02-26 02:24 – Updated: 2026-05-11 19:05
VLAI
EPSS
VEX
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)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:32 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| 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) |
guessed | |
| 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) |
guessed |
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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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: agregar bloques GDT reservados comprobar Capturamos un problema de puntero NULL al cambiar el tama\u00f1o de una imagen ext4 corrupta que reci\u00e9n borra la caracter\u00edstica resize_inode (no ejecuta e2fsck). Podr\u00eda reproducirse simplemente siguiendo los pasos. El problema se debe a que se borr\u00f3 la caracter\u00edstica resize_inode y convertir\u00e1 el sistema de archivos al modo meta_bg en ext4_resize_fs(), pero es-\u0026gt;s_reserved_gdt_blocks no se redujo a cero, por lo que podr\u00edamos llamar por error a reserve_backup_gdb() y pasarle un resize_inode no inicializado al agregar nuevos descriptores de grupo. mkfs.ext4 /dev/sda 3G tune2fs -O ^resize_inode /dev/sda #olvid\u00e9 ejecutar el montaje e2fsck solicitado /dev/sda /mnt resize2fs /dev/sda 8G ======== ERROR: desreferencia de puntero NULL del n\u00facleo, direcci\u00f3n: 0000000000000028 CPU: 19 PID: 3243 Comm: resize2fs No contaminado 5.18.0-rc7-00001-gfde086c5ebfd #748 ... RIP: 0010:ext4_flex_group_add+0xe08/0x2570 ... Seguimiento de llamadas: 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 ======== La soluci\u00f3n es simple, agregue una comprobaci\u00f3n en ext4_resize_begin() para asegurarse de que es-\u0026gt;s_reserved_gdt_blocks sea cero cuando la funci\u00f3n resize_inode est\u00e9 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-29T21:15:57+00:00",
"cve": "CVE-2022-49707",
"id": "CVE-2022-49707",
"initial_release_date": "2022-01-01T00:00:00+00:00",
"product_status:fixed": "286",
"product_status:known_affected": "80",
"product_status:known_not_affected": "76",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ext4: add reserved GDT blocks check",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49707.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-02T02:03:07Z",
"cve": "CVE-2022-49707",
"id": "CVE-2022-49707",
"initial_release_date": "2025-02-27T03:02:29Z",
"product_status:known_affected": "427",
"product_status:known_not_affected": "407",
"product_status:recommended": "387",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2022-49707",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49707.json",
"version": "72"
},
"vulnrichment": {
"containers": "{\"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\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": 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\"version\": \"5.19\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ext4/resize.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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-\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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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