In the Linux kernel, the following vulnerability has been resolved:
lib/iov_iter: fix to increase non slab folio refcount
When testing EROFS file-backed mount over v9fs on qemu, I encountered a folio UAF issue. The page sanity check reports the following call trace. The root cause is that pages in bvec are coalesced across a folio bounary. The refcount of all non-slab folios should be increased to ensure p9_releas_pages can put them correctly.
BUG: Bad page state in process md5sum pfn:18300 page: refcount:0 mapcount:0 mapping:00000000d5ad8e4e index:0x60 pfn:0x18300 head: order:0 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 aops:z_erofs_aops ino:30b0f dentry name(?):"GoogleExtServicesCn.apk" flags: 0x100000000000041(locked|head|node=0|zone=1) raw: 0100000000000041 dead000000000100 dead000000000122 ffff888014b13bd0 raw: 0000000000000060 0000000000000020 00000000ffffffff 0000000000000000 head: 0100000000000041 dead000000000100 dead000000000122 ffff888014b13bd0 head: 0000000000000060 0000000000000020 00000000ffffffff 0000000000000000 head: 0100000000000000 0000000000000000 ffffffffffffffff 0000000000000000 head: 0000000000000010 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set Call Trace: dump_stack_lvl+0x53/0x70 bad_page+0xd4/0x220 __free_pages_ok+0x76d/0xf30 __folio_put+0x230/0x320 p9_release_pages+0x179/0x1f0 p9_virtio_zc_request+0xa2a/0x1230 p9_client_zc_rpc.constprop.0+0x247/0x700 p9_client_read_once+0x34d/0x810 p9_client_read+0xf3/0x150 v9fs_issue_read+0x111/0x360 netfs_unbuffered_read_iter_locked+0x927/0x1390 netfs_unbuffered_read_iter+0xa2/0xe0 vfs_iocb_iter_read+0x2c7/0x460 erofs_fileio_rq_submit+0x46b/0x5b0 z_erofs_runqueue+0x1203/0x21e0 z_erofs_readahead+0x579/0x8b0 read_pages+0x19f/0xa70 page_cache_ra_order+0x4ad/0xb80 filemap_readahead.isra.0+0xe7/0x150 filemap_get_pages+0x7aa/0x1890 filemap_read+0x320/0xc80 vfs_read+0x6c6/0xa30 ksys_read+0xf9/0x1c0 do_syscall_64+0x9e/0x1a0 entry_SYSCALL_64_after_hwframe+0x71/0x79
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Suse | — | Upgrade kernel-default-livepatchUpgrade kernel-source-azureUpgrade kernel-azure-develUpgrade kernel-64kbUpgrade kernel-default-develUpgrade kernel-kvmsmall-develUpgrade kernel-azureUpgrade kernel-develUpgrade kernel-kvmsmallUpgrade kernel-default-vdsoUpgrade kernel-sourceUpgrade kernel-64kb-develUpgrade kernel-zfcpdumpUpgrade kernel-source-vanillaUpgrade kernel-devel-azureUpgrade kernel-64kb-extraUpgrade kernel-azure-vdsoUpgrade kernel-macrosUpgrade kernel-kvmsmall-vdsoUpgrade kernel-docs-htmlUpgrade kernel-docsUpgrade kernel-obs-qaUpgrade kernel-azure-extraUpgrade kernel-default-extraUpgrade kernel-symsUpgrade kernel-default | Dec 5, 2025 | Dec 5, 2025 |
| Ubuntu | — | Upgrade linux-image-6.14.0-22-genericUpgrade linux-image-6.14.0-1008-gcp-64kUpgrade linux-image-oracleUpgrade linux-image-6.14.0-1008-gcpUpgrade linux-image-6.14.0-1004-realtimeUpgrade linux-image-azure-fdeUpgrade linux-image-6.14.0-1007-oracle-64kUpgrade linux-image-6.14.0-1007-oracleUpgrade linux-image-6.14.0-1007-raspiUpgrade linux-image-realtimeUpgrade linux-image-awsUpgrade linux-image-6.14.0-1007-awsUpgrade linux-image-6.14.0-22-generic-64kUpgrade linux-image-oracle-64kUpgrade linux-image-6.14.0-1007-aws-64kUpgrade linux-image-azureUpgrade linux-image-generic-64kUpgrade linux-image-aws-64kUpgrade linux-image-6.14.0-1007-azure-fdeUpgrade linux-image-6.14.0-1007-azureUpgrade linux-image-raspiUpgrade linux-image-gcp-64kUpgrade linux-image-gcpUpgrade linux-image-generic | Jun 26, 2025 | May 1, 2025 |
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