CVE-2022-48986

mm/gup: fix gup_pud_range() for dax

State: Published
Severity: 7.8 High
Published: Oct 21, 2024
Updated: Aug 5, 2026
Reserved: Aug 22, 2024

Description

In the Linux kernel, the following vulnerability has been resolved:

mm/gup: fix gup_pud_range() for dax

For dax pud, pud_huge() returns true on x86. So the function works as long as hugetlb is configured. However, dax doesn't depend on hugetlb. Commit 414fd080d125 ("mm/gup: fix gup_pmd_range() for dax") fixed devmap-backed huge PMDs, but missed devmap-backed huge PUDs. Fix this as well.

This fixes the below kernel panic:

general protection fault, probably for non-canonical address 0x69e7c000cc478: 0000 [#1] SMP < snip > Call Trace: <TASK> get_user_pages_fast+0x1f/0x40 iov_iter_get_pages+0xc6/0x3b0 ? mempool_alloc+0x5d/0x170 bio_iov_iter_get_pages+0x82/0x4e0 ? bvec_alloc+0x91/0xc0 ? bio_alloc_bioset+0x19a/0x2a0 blkdev_direct_IO+0x282/0x480 ? __io_complete_rw_common+0xc0/0xc0 ? filemap_range_has_page+0x82/0xc0 generic_file_direct_write+0x9d/0x1a0 ? inode_update_time+0x24/0x30 __generic_file_write_iter+0xbd/0x1e0 blkdev_write_iter+0xb4/0x150 ? io_import_iovec+0x8d/0x340 io_write+0xf9/0x300 io_issue_sqe+0x3c3/0x1d30 ? sysvec_reschedule_ipi+0x6c/0x80 __io_queue_sqe+0x33/0x240 ? fget+0x76/0xa0 io_submit_sqes+0xe6a/0x18d0 ? __fget_light+0xd1/0x100 __x64_sys_io_uring_enter+0x199/0x880 ? __context_tracking_enter+0x1f/0x70 ? irqentry_exit_to_user_mode+0x24/0x30 ? irqentry_exit+0x1d/0x30 ? __context_tracking_exit+0xe/0x70 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fc97c11a7be < snip > </TASK> ---[ end trace 48b2e0e67debcaeb ]--- RIP: 0010:internal_get_user_pages_fast+0x340/0x990 < snip > Kernel panic - not syncing: Fatal exception Kernel Offset: disabled

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	414fd080d125408cb15d04ff4907e1dd8145c8c7 to before 04edfa3dc06ecfc6133a33bc7271298782dee875Affected 414fd080d125408cb15d04ff4907e1dd8145c8c7 to before f1cf856123ceb766c49967ec79b841030fa1741fAffected 414fd080d125408cb15d04ff4907e1dd8145c8c7 to before 3ac29732a2ffa64c7de13a072b0f2848b9c11037Affected 414fd080d125408cb15d04ff4907e1dd8145c8c7 to before e06d13c36ded750c72521b600293befebb4e56c5Affected 414fd080d125408cb15d04ff4907e1dd8145c8c7 to before fcd0ccd836ffad73d98a66f6fea7b16f735ea920Affected c133d8eb894cb280f331608c6f1962ba9fbfe6b0Affected 538162d21ac877b060dc057c89f13718f5caffc5Affected 8b1a7762e0dac5db42a003009fdcb425f10baa07Affected 4.9.165 to before 4.10Affected 4.14.108 to before 4.15Affected 4.19.31 to before 4.20Affected
LinuxLinux	5.0Affected before 5.0Not affected 5.4.227 through 5.4.Not affected 5.10.159 through 5.10.Not affected 5.15.83 through 5.15.Not affected 6.0.13 through 6.0.Not affected 6.1 and laterNot affected

Product

Versions

LinuxLinux

414fd080d125408cb15d04ff4907e1dd8145c8c7 to before 04edfa3dc06ecfc6133a33bc7271298782dee875Affected
414fd080d125408cb15d04ff4907e1dd8145c8c7 to before f1cf856123ceb766c49967ec79b841030fa1741fAffected
414fd080d125408cb15d04ff4907e1dd8145c8c7 to before 3ac29732a2ffa64c7de13a072b0f2848b9c11037Affected
414fd080d125408cb15d04ff4907e1dd8145c8c7 to before e06d13c36ded750c72521b600293befebb4e56c5Affected
414fd080d125408cb15d04ff4907e1dd8145c8c7 to before fcd0ccd836ffad73d98a66f6fea7b16f735ea920Affected
c133d8eb894cb280f331608c6f1962ba9fbfe6b0Affected
538162d21ac877b060dc057c89f13718f5caffc5Affected
8b1a7762e0dac5db42a003009fdcb425f10baa07Affected
4.9.165 to before 4.10Affected
4.14.108 to before 4.15Affected
4.19.31 to before 4.20Affected

LinuxLinux

5.0Affected
before 5.0Not affected
5.4.227 through 5.4.*Not affected
5.10.159 through 5.10.*Not affected
5.15.83 through 5.15.*Not affected
6.0.13 through 6.0.*Not affected
6.1 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.