CVE - CVE-2022-49707

CVE-ID
CVE-2022-49707	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/0dc2fca8e4f9ac4a40e8424a10163369cca0cc06 URL:https://git.kernel.org/stable/c/0dc2fca8e4f9ac4a40e8424a10163369cca0cc06 MISC:https://git.kernel.org/stable/c/33b1bba31f4c784d33d2c2517964bdccdc9204cd URL:https://git.kernel.org/stable/c/33b1bba31f4c784d33d2c2517964bdccdc9204cd MISC:https://git.kernel.org/stable/c/7c921328ac760bba780bdace41f4cd045f7f1405 URL:https://git.kernel.org/stable/c/7c921328ac760bba780bdace41f4cd045f7f1405 MISC:https://git.kernel.org/stable/c/af75c481a2e45e70f62f5942c93695e95bf7bd21 URL:https://git.kernel.org/stable/c/af75c481a2e45e70f62f5942c93695e95bf7bd21 MISC:https://git.kernel.org/stable/c/b55c3cd102a6f48b90e61c44f7f3dda8c290c694 URL:https://git.kernel.org/stable/c/b55c3cd102a6f48b90e61c44f7f3dda8c290c694 MISC:https://git.kernel.org/stable/c/b9747263b13e5290ac4d63bec47e38f701303cad URL:https://git.kernel.org/stable/c/b9747263b13e5290ac4d63bec47e38f701303cad MISC:https://git.kernel.org/stable/c/bfd004a1d3a062aac300523d406ac1f3e5f1a82c URL:https://git.kernel.org/stable/c/bfd004a1d3a062aac300523d406ac1f3e5f1a82c MISC:https://git.kernel.org/stable/c/fba54289176702a7caac0b64738406775817f451 URL:https://git.kernel.org/stable/c/fba54289176702a7caac0b64738406775817f451
Assigning CNA
kernel.org
Date Record Created
20250226	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250226)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
This is an record on the CVE List, which provides common identifiers for publicly known cybersecurity vulnerabilities.
Search CVE Using Keywords: You can also search by reference using the CVE Reference Maps.
For More Information: CVE Request Web Form (select "Other" from dropdown)