txEnd() in fs/jfs/jfs_txnmgr.c reads the log pointer from the superblock
info, drops TXN_LOCK and then takes log->gclock, while lmLogClose() can
free that log during umount.
No fix has been merged. The 2023 proposal was withdrawn by its author
("I think my fix method is not a good solution"), and the 2026 proposals
for the same unmount race are unreviewed:
https://lore.kernel.org/all/[email protected]/
https://lore.kernel.org/all/[email protected]/
https://lore.kernel.org/all/[email protected]/
The txEnd() sequence is unchanged in linux-next 20260727, and the
use-after-free was reported again in June 2026 against 7.0-rc1, with the
free stack in lmLogClose() via jfs_umount(); syzbot still lists it open:
https://lore.kernel.org/all/[email protected]/
https://syzkaller.appspot.com/bug?extid=ea7ed3bb2f444cb4dfeb
CONFIG_JFS_FS=n in both ktypes/standard and ktypes/preempt-rt in
yocto-kernel-cache, and no fragment enables it.
CC: Paul Barker <[email protected]>
AI-Generated: Uses Claude (claude-opus-5)
Signed-off-by: Junjie Cao <[email protected]>
---
v3:
- correct the claim that only one fix was proposed and withdrawn:
further fixes were posted in 2026 but none is merged
- add the syzbot dashboard and the June 2026 report as evidence the
race is still live in mainline
v2:
https://lore.kernel.org/openembedded-core/[email protected]/
meta/recipes-kernel/linux/cve-exclusion.inc | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/meta/recipes-kernel/linux/cve-exclusion.inc
b/meta/recipes-kernel/linux/cve-exclusion.inc
index a909aef..c4a9dea 100644
--- a/meta/recipes-kernel/linux/cve-exclusion.inc
+++ b/meta/recipes-kernel/linux/cve-exclusion.inc
@@ -237,3 +237,10 @@ CVE_STATUS[CVE-2022-1247] = "fixed-version: Fixed from
version 6.17"
# https://www.willsroot.io/2022/12/entrybleed.html
CVE_STATUS[CVE-2022-4543] = "unpatched: no upstream fix, KASLR is not \
treated as a defence against local attackers"
+
+# JFS txEnd()/lmLogClose() use-after-free on unmount. No fix merged: the
+# 2023 proposal was withdrawn, the 2026 proposals are unreviewed, and the
+# racy code is unchanged; syzbot still reproduces it.
+# https://syzkaller.appspot.com/bug?extid=ea7ed3bb2f444cb4dfeb
+CVE_STATUS[CVE-2023-3397] = "unpatched: no upstream fix merged, the \
+affected fs/jfs txEnd()/lmLogClose() unmount race is unchanged"
--
2.43.0
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