In the Linux kernel, the following vulnerability has been resolved:
f2fs: avoid reading already updated pages during GC
We found the following issue during fuzz testing:
page: refcount:3 mapcount:0 mapping:00000000b6e89c65 index:0x18b2dc pfn:0x161ba9 memcg:f8ffff800e269c00 aops:f2fs_meta_aops ino:2 flags: 0x52880000000080a9(locked|waiters|uptodate|lru|private|zone=1|kasantag=0x4a) raw: 52880000000080a9 fffffffec6e17588 fffffffec0ccc088 a7ffff8067063618 raw: 000000000018b2dc 0000000000000009 00000003ffffffff f8ffff800e269c00 page dumped because: VM_BUG_ON_FOLIO(folio_test_uptodate(folio)) page_owner tracks the page as allocated post_alloc_hook+0x58c/0x5ec prep_new_page+0x34/0x284 get_page_from_freelist+0x2dcc/0x2e8c __alloc_pages_noprof+0x280/0x76c __folio_alloc_noprof+0x18/0xac __filemap_get_folio+0x6bc/0xdc4 pagecache_get_page+0x3c/0x104 do_garbage_collect+0x5c78/0x77a4 f2fs_gc+0xd74/0x25f0 gc_thread_func+0xb28/0x2930 kthread+0x464/0x5d8 ret_from_fork+0x10/0x20 ------------[ cut here ]------------ kernel BUG at mm/filemap.c:1563! folio_end_read+0x140/0x168 f2fs_finish_read_bio+0x5c4/0xb80 f2fs_read_end_io+0x64c/0x708 bio_endio+0x85c/0x8c0 blk_update_request+0x690/0x127c scsi_end_request+0x9c/0xb8c scsi_io_completion+0xf0/0x250 scsi_finish_command+0x430/0x45c scsi_complete+0x178/0x6d4 blk_mq_complete_request+0xcc/0x104 scsi_done_internal+0x214/0x454 scsi_done+0x24/0x34
which is similar to the problem reported by syzbot: https://syzkaller.appspot.com/bug?extid=3686758660f980b402dc
This case is consistent with the description in commit 9bf1a3f ("f2fs: avoid GC causing encrypted file corrupted"): Page 1 is moved from blkaddr A to blkaddr B by move_data_block, and after being written it is marked as uptodate. Then, Page 1 is moved from blkaddr B to blkaddr C, VM_BUG_ON_FOLIO was triggered in the endio initiated by ra_data_block.
There is no need to read Page 1 again from blkaddr B, since it has already been updated. Therefore, avoid initiating I/O in this case.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Ubuntu | — | Upgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-oem-24.04aUpgrade linux-image-azure-7.0Upgrade linux-image-nvidiaUpgrade linux-image-7.0.0-1010-azureUpgrade linux-image-nvidia-64kUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-oem-26.04Upgrade linux-image-7.0.0-2016-nvidia-bos-64kUpgrade linux-image-aws-64kUpgrade linux-image-gke-64k-7.0Upgrade linux-image-oem-24.04Upgrade linux-image-7.0.0-1016-nvidia-64kUpgrade linux-image-gcp-64kUpgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-oem-26.04aUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-azureUpgrade linux-image-oem-24.04dUpgrade linux-image-nvidia-bos-7.0Upgrade linux-image-oem-7.0Upgrade linux-image-virtual-hwe-26.04Upgrade linux-image-generic-64kUpgrade linux-image-oracle-64k-7.0Upgrade linux-image-generic-64k-7.0Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-7.0.0-1003-gkeUpgrade linux-image-ibm-7.0Upgrade linux-image-oracle-7.0Upgrade linux-image-oracle-64kUpgrade linux-image-raspiUpgrade linux-image-nvidia-64k-7.0Upgrade linux-image-nvidia-bos-64kUpgrade linux-image-7.0.0-1009-aws-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-7.0.0-1008-gcp-64kUpgrade linux-image-7.0.0-1010-ibmUpgrade linux-image-raspi-realtimeUpgrade linux-image-gcpUpgrade linux-image-7.0.0-2016-nvidia-bosUpgrade linux-image-ibmUpgrade linux-image-genericUpgrade linux-image-gkeUpgrade linux-image-7.0.0-1008-oracleUpgrade linux-image-nvidia-7.0Upgrade linux-image-7.0.0-28-realtime-64kUpgrade linux-image-gcp-7.0Upgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-generic-hwe-26.04Upgrade linux-image-aws-7.0Upgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-raspi-realtime-7.0Upgrade linux-image-7.0.0-28-generic-64kUpgrade linux-image-gke-64kUpgrade linux-image-7.0.0-1015-raspiUpgrade linux-image-7.0.0-1008-gcpUpgrade linux-image-awsUpgrade linux-image-oem-24.04bUpgrade linux-image-7.0.0-1014-azureUpgrade linux-image-gke-hwe-26.04Upgrade linux-image-azure-fdeUpgrade linux-image-7.0.0-28-realtimeUpgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-realtime-7.0Upgrade linux-image-generic-7.0Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-7.0.0-1009-azure-fdeUpgrade linux-image-realtime-64kUpgrade linux-image-virtual-7.0Upgrade linux-image-realtimeUpgrade linux-image-azure-fde-7.0Upgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-gke-7.0Upgrade linux-image-7.0.0-1015-raspi-realtimeUpgrade linux-image-7.0.0-1009-awsUpgrade linux-image-raspi-7.0Upgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-aws-64k-7.0Upgrade linux-image-7.0.0-1016-nvidiaUpgrade linux-image-oracleUpgrade linux-image-7.0.0-28-genericUpgrade linux-image-7.0.0-1003-gke-64kUpgrade linux-image-oem-24.04cUpgrade linux-image-7.0.0-1008-oracle-64kUpgrade linux-image-7.0.0-1009-oemUpgrade linux-image-nvidia-bosUpgrade linux-image-virtualUpgrade linux-image-realtime-64k-7.0 | Jul 20, 2026 | Jun 24, 2026 |
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