cbcvebase.
CVE-2022-49707
published 2025-02-26

CVE-2022-49707: 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…

PriorityP421medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.28%
20.2th percentile
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: 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.

Affected

22 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 5.18.14-1 (bookworm)linux 5.18.14-1 (bookworm)
linuxlinux——
linuxlinux>= 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 < 0dc2fca8e4f9ac4a40e8424a10163369cca0cc060dc2fca8e4f9ac4a40e8424a10163369cca0cc06
linuxlinux>= 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 < 7c921328ac760bba780bdace41f4cd045f7f14057c921328ac760bba780bdace41f4cd045f7f1405
linuxlinux>= 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 < b9747263b13e5290ac4d63bec47e38f701303cadb9747263b13e5290ac4d63bec47e38f701303cad
linuxlinux>= 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 < fba54289176702a7caac0b64738406775817f451fba54289176702a7caac0b64738406775817f451
linuxlinux>= 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 < bfd004a1d3a062aac300523d406ac1f3e5f1a82cbfd004a1d3a062aac300523d406ac1f3e5f1a82c
linuxlinux>= 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 < 33b1bba31f4c784d33d2c2517964bdccdc9204cd33b1bba31f4c784d33d2c2517964bdccdc9204cd
linuxlinux>= 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 < af75c481a2e45e70f62f5942c93695e95bf7bd21af75c481a2e45e70f62f5942c93695e95bf7bd21
linuxlinux>= 1c6bd7173d66b3dfdefcedb38cabc1fb03997509 < b55c3cd102a6f48b90e61c44f7f3dda8c290c694b55c3cd102a6f48b90e61c44f7f3dda8c290c694
linuxlinux_kernel< 4.9.3204.9.320
linuxlinux_kernel——
linuxlinux_kernel>= 0 < 5.10.127-15.10.127-1
linuxlinux_kernel>= 0 < 5.18.14-15.18.14-1
linuxlinux_kernel>= 0 < 5.18.14-15.18.14-1
linuxlinux_kernel>= 0 < 5.18.14-15.18.14-1
linuxlinux_kernel>= 4.10 < 4.14.2854.14.285
linuxlinux_kernel>= 4.15 < 4.19.2494.19.249
linuxlinux_kernel>= 4.20 < 5.4.2005.4.200
linuxlinux_kernel>= 5.11 < 5.15.495.15.49
linuxlinux_kernel>= 5.16 < 5.18.65.18.6
linuxlinux_kernel>= 5.5 < 5.10.1245.10.124

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.