Return of Wrong Status Code Affecting kernel-rt-modules package, versions *
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Test your applications- Snyk IDSNYK-CENTOS10-KERNELRTMODULES-20287302
- published30 Sept 2026
- disclosed25 Sept 2026
Introduced: 25 Sep 2026
NewCVE-2026-97902 (opens in a new tab)How to fix?
There is no fixed version for Centos:10 kernel-rt-modules.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-modules package and not the kernel-rt-modules package as distributed by Centos.
See How to fix? for Centos:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
fs: don't return -EINVAL for successful nested thaw
Commit 7366f8b6fc6a ("fs: handle freezing from multiple devices") replaced the freeze_holders bitmask with per-holder counters to allow nested freezes. In the bitmask version, a thaw that released a shared hold while another holder remained returned 0. Since the rework, thaw_super_locked() drops the freeze reference via freeze_dec() but then returns -EINVAL when other freezers remain, misinforming the caller: the thaw did succeed, the superblock just stays frozen for the remaining holders.
This breaks bdev-initiated freezing. When a filesystem is frozen with FIFREEZE and additionally frozen via bdev_freeze() -- which nests by design, see fs_bdev_freeze() -- the subsequent bdev_thaw() receives -EINVAL from the holder op although its freeze reference was dropped, and therefore keeps bd_fsfreeze_count elevated. Then device-mapper's unlock_fs() ignores bdev_thaw()'s return value, so nothing rebalances the count. After the user's FITHAW and umount, the block device can never be mounted again:
dm-1: Can't mount, blockdev is frozen
There is no way for userspace to drop the leaked count; only destroying the block device (or a reboot) recovers the device.
Reproducer (any kernel since v6.8):
dmsetup create dut --table "0 $(blockdev --getsz "$DEV") linear $DEV 0"
mkfs.ext4 /dev/mapper/dut
mount /dev/mapper/dut /mnt
fsfreeze --freeze /mnt # freeze_ucount == 1
dmsetup suspend dut # bd_fsfreeze_count == 1, ucount == 2
dmsetup resume dut # ucount 2 -> 1, but thaw_super()
# returns -EINVAL, so bdev_thaw()
# keeps bd_fsfreeze_count at 1
fsfreeze --unfreeze /mnt # filesystem thaws fine
umount /mnt
mount /dev/mapper/dut /mnt # EBUSY, forever
The same happens with fsfreeze held across an LVM snapshot of the origin volume.
fs_bdev_thaw()'s documentation already describes the intended semantics: "If this function returns zero it doesn't mean that the filesystem is unfrozen as it may have been frozen multiple times". Restore them by returning 0 when a nested thaw drops its hold while other freezers remain. Thawing without holding a freeze still fails with -EINVAL as may_unfreeze() rejects that case before the reference count is touched.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2541313
- https://access.redhat.com/security/cve/CVE-2026-97902
- https://git.kernel.org/stable/c/111339816138f042a59778322f941edc26903484
- https://git.kernel.org/stable/c/76e478499913dc1f368aebe85b28b7d1265985ff
- https://git.kernel.org/stable/c/fe967191e5851ea79818c5fe4e781c3882139218
- https://git.kernel.org/stable/c/ff2a694f6613d54ebd77ba72583d4d94446f55bd