N/A - CVE-2025-37779

Executive Summary

Informations
Name	CVE-2025-37779	First vendor Publication	2025-05-01
Vendor	Cve	Last vendor Modification	2025-05-02

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score	NA
Base Score	NA	Environmental Score	NA
impact SubScore	NA	Temporal Score	NA
Exploitabality Sub Score	NA

Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score	N/A	Attack Range	N/A
Cvss Impact Score	N/A	Attack Complexity	N/A
Cvss Expoit Score	N/A	Authentication	N/A
Calculate full CVSS 2.0 Vectors scores

Detail

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