ext4: avoid online resizing failures due to oversized flex bg

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Summary

CVECVE-2023-52622
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-03-26 18:15:08 UTC
Updated2026-10-15 01:17:15 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ext4: avoid online resizing failures due to oversized flex bg When we online resize an ext4 filesystem with a oversized flexbg_size, mkfs.ext4 -F -G 67108864 $dev -b 4096 100M mount $dev $dir resize2fs $dev 16G the following WARN_ON is triggered: ================================================================== WARNING: CPU: 0 PID: 427 at mm/page_alloc.c:4402 __alloc_pages+0x411/0x550 Modules linked in: sg(E) CPU: 0 PID: 427 Comm: resize2fs Tainted: G E 6.6.0-rc5+ #314 RIP: 0010:__alloc_pages+0x411/0x550 Call Trace: <TASK> __kmalloc_large_node+0xa2/0x200 __kmalloc+0x16e/0x290 ext4_resize_fs+0x481/0xd80 __ext4_ioctl+0x1616/0x1d90 ext4_ioctl+0x12/0x20 __x64_sys_ioctl+0xf0/0x150 do_syscall_64+0x3b/0x90 ================================================================== This is because flexbg_size is too large and the size of the new_group_data array to be allocated exceeds MAX_ORDER. Currently, the minimum value of MAX_ORDER is 8, the minimum value of PAGE_SIZE is 4096, the corresponding maximum number of groups that can be allocated is: (PAGE_SIZE << MAX_ORDER) / sizeof(struct ext4_new_group_data) ≈ 21845 And the value that is down-aligned to the power of 2 is 16384. Therefore, this value is defined as MAX_RESIZE_BG, and the number of groups added each time does not exceed this value during resizing, and is added multiple times to complete the online resizing. The difference is that the metadata in a flex_bg may be more dispersed.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-770

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 28c7bac0091687e6116ebd6c179e154ae4053c90 cd1f93ca97a9136989f3bd2bf90696732a2ed644 git Not specified
CNA Linux Linux affected 28c7bac0091687e6116ebd6c179e154ae4053c90 b183fe8702e78bba3dcef8e7193cab6898abee07 git Not specified
CNA Linux Linux affected 28c7bac0091687e6116ebd6c179e154ae4053c90 cfbbb3199e71b63fc26cee0ebff327c47128a1e8 git Not specified
CNA Linux Linux affected 28c7bac0091687e6116ebd6c179e154ae4053c90 d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90 git Not specified
CNA Linux Linux affected 28c7bac0091687e6116ebd6c179e154ae4053c90 6d2cbf517dcabc093159cf138ad5712c9c7fa954 git Not specified
CNA Linux Linux affected 28c7bac0091687e6116ebd6c179e154ae4053c90 8b1413dbfe49646eda2c00c0f1144ee9d3368e0c git Not specified
CNA Linux Linux affected 28c7bac0091687e6116ebd6c179e154ae4053c90 dc3e0f55bec4410f3d74352c4a7c79f518088ee2 git Not specified
CNA Linux Linux affected 28c7bac0091687e6116ebd6c179e154ae4053c90 5d1935ac02ca5aee364a449a35e2977ea84509b0 git Not specified
CNA Linux Linux affected 3.3 Not specified
CNA Linux Linux unaffected 3.3 semver Not specified
CNA Linux Linux unaffected 4.19.307 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.269 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.210 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.149 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.77 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.16 6.6.* semver Not specified
CNA Linux Linux unaffected 6.7.4 6.7.* semver Not specified
CNA Linux Linux unaffected 6.8 * original_commit_for_fix Not specified
ADP Siemens RUGGEDCOM RST2428P unaffected * custom Not specified
ADP Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 Family unaffected * custom Not specified
ADP Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 Family unaffected * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified

References

ReferenceSourceLinkTags
cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
lists.debian.org/debian-lts-announce/2024/06/msg00017.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List
git.kernel.org/stable/c/dc3e0f55bec4410f3d74352c4a7c79f518088ee2 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/8b1413dbfe49646eda2c00c0f1144ee9d3368e0c af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/6d2cbf517dcabc093159cf138ad5712c9c7fa954 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/d76c8d7ffe163c6bf2f1ef680b0539c2b3902b90 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/cfbbb3199e71b63fc26cee0ebff327c47128a1e8 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/b183fe8702e78bba3dcef8e7193cab6898abee07 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-613116.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/5d1935ac02ca5aee364a449a35e2977ea84509b0 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2024/06/msg00020.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List
git.kernel.org/stable/c/cd1f93ca97a9136989f3bd2bf90696732a2ed644 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 6000567 Debian Security Update for linux (DSA 5658-1)

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