ext4: fix task hung in ext4_xattr_delete_inode

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2023-53089
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-05-02 16:15:27 UTC
Updated2026-11-05 21:17:12 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ext4: fix task hung in ext4_xattr_delete_inode Syzbot reported a hung task problem: ================================================================== INFO: task syz-executor232:5073 blocked for more than 143 seconds. Not tainted 6.2.0-rc2-syzkaller-00024-g512dee0c00ad #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-exec232 state:D stack:21024 pid:5073 ppid:5072 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:5244 [inline] __schedule+0x995/0xe20 kernel/sched/core.c:6555 schedule+0xcb/0x190 kernel/sched/core.c:6631 __wait_on_freeing_inode fs/inode.c:2196 [inline] find_inode_fast+0x35a/0x4c0 fs/inode.c:950 iget_locked+0xb1/0x830 fs/inode.c:1273 __ext4_iget+0x22e/0x3ed0 fs/ext4/inode.c:4861 ext4_xattr_inode_iget+0x68/0x4e0 fs/ext4/xattr.c:389 ext4_xattr_inode_dec_ref_all+0x1a7/0xe50 fs/ext4/xattr.c:1148 ext4_xattr_delete_inode+0xb04/0xcd0 fs/ext4/xattr.c:2880 ext4_evict_inode+0xd7c/0x10b0 fs/ext4/inode.c:296 evict+0x2a4/0x620 fs/inode.c:664 ext4_orphan_cleanup+0xb60/0x1340 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5516 [inline] ext4_fill_super+0x81cd/0x8700 fs/ext4/super.c:5644 get_tree_bdev+0x400/0x620 fs/super.c:1282 vfs_get_tree+0x88/0x270 fs/super.c:1489 do_new_mount+0x289/0xad0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa5406fd5ea RSP: 002b:00007ffc7232f968 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fa5406fd5ea RDX: 0000000020000440 RSI: 0000000020000000 RDI: 00007ffc7232f970 RBP: 00007ffc7232f970 R08: 00007ffc7232f9b0 R09: 0000000000000432 R10: 0000000000804a03 R11: 0000000000000202 R12: 0000000000000004 R13: 0000555556a7a2c0 R14: 00007ffc7232f9b0 R15: 0000000000000000 </TASK> ================================================================== The problem is that the inode contains an xattr entry with ea_inum of 15 when cleaning up an orphan inode <15>. When evict inode <15>, the reference counting of the corresponding EA inode is decreased. When EA inode <15> is found by find_inode_fast() in __ext4_iget(), it is found that the EA inode holds the I_FREEING flag and waits for the EA inode to complete deletion. As a result, when inode <15> is being deleted, we wait for inode <15> to complete the deletion, resulting in an infinite loop and triggering Hung Task. To solve this problem, we only need to check whether the ino of EA inode and parent is the same before getting EA inode.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-835

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e50e5129f384ae282adebfb561189cdb19b81cee efddc7e106fdf8d1f62d45e79de78f63b7c04fba git Not specified
CNA Linux Linux affected e50e5129f384ae282adebfb561189cdb19b81cee 64b72f5e7574020dea62ab733d88a54d903c42a1 git Not specified
CNA Linux Linux affected e50e5129f384ae282adebfb561189cdb19b81cee 2c96c52aeaa6fd9163cfacdd98778b4a0398ef18 git Not specified
CNA Linux Linux affected e50e5129f384ae282adebfb561189cdb19b81cee a98160d8f3e6242ca9b7f443f26e7ef3a61ba684 git Not specified
CNA Linux Linux affected e50e5129f384ae282adebfb561189cdb19b81cee 1aec41c98cce61d19ce89650895e51b9f3cdef13 git Not specified
CNA Linux Linux affected e50e5129f384ae282adebfb561189cdb19b81cee 94fd091576b12540924f6316ebc0678e84cb2800 git Not specified
CNA Linux Linux affected e50e5129f384ae282adebfb561189cdb19b81cee 73f7987fe1b82596f1a380e85cd0097ebaae7e01 git Not specified
CNA Linux Linux affected e50e5129f384ae282adebfb561189cdb19b81cee 0f7bfd6f8164be32dbbdf36aa1e5d00485c53cd7 git Not specified
CNA Linux Linux affected 4.13 Not specified
CNA Linux Linux unaffected 4.13 semver Not specified
CNA Linux Linux unaffected 4.14.311 4.14.* semver Not specified
CNA Linux Linux unaffected 4.19.279 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.238 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.176 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.104 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.21 6.1.* semver Not specified
CNA Linux Linux unaffected 6.2.8 6.2.* semver Not specified
CNA Linux Linux unaffected 6.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0f7bfd6f8164be32dbbdf36aa1e5d00485c53cd7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/a98160d8f3e6242ca9b7f443f26e7ef3a61ba684 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/73f7987fe1b82596f1a380e85cd0097ebaae7e01 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2c96c52aeaa6fd9163cfacdd98778b4a0398ef18 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1aec41c98cce61d19ce89650895e51b9f3cdef13 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/efddc7e106fdf8d1f62d45e79de78f63b7c04fba 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/94fd091576b12540924f6316ebc0678e84cb2800 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/64b72f5e7574020dea62ab733d88a54d903c42a1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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