CVE-2026-43066— ext4: fix iloc.bh leak in ext4_fc_replay_inode() error paths
Possible ATT&CK Techniques 2AI
T1499.002 · Service Exhaustion Flood T1499.004 · Application or System ExploitationAffected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2< 0892f12cd49fde5d5db68137923db107f894f3a3 | affected |
8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2< 5a63033696e60b5d70816f1d119645ac5b0b0a03 | affected | ||
8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2< 9c90449a9ac2cd1ba540ad2561b8b70c1bfb0a25 | affected | ||
8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2< ca99cbcc316cdfd2040cc2b13d1426ccb3b3b50b | affected | ||
8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2< 19782b4c793b49a6aa4abbb307ddff3610009d21 | affected | ||
8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2< f7817ad399d604e8639005d87d148b5ec626ad26 | affected | ||
8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2< c426231e3d51916e83b6d1ab7ed8a65e83bca5b4 | affected | ||
8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2< ec0a7500d8eace5b4f305fa0c594dd148f0e8d29 | affected | ||
| … +10 more rows | |||
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I. Basic Information for CVE-2026-43066
Vulnerability Information
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Vulnerability Title
ext4: fix iloc.bh leak in ext4_fc_replay_inode() error paths
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: fix iloc.bh leak in ext4_fc_replay_inode() error paths During code review, Joseph found that ext4_fc_replay_inode() calls ext4_get_fc_inode_loc() to get the inode location, which holds a reference to iloc.bh that must be released via brelse(). However, several error paths jump to the 'out' label without releasing iloc.bh: - ext4_handle_dirty_metadata() failure - sync_dirty_buffer() failure - ext4_mark_inode_used() failure - ext4_iget() failure Fix this by introducing an 'out_brelse' label placed just before the existing 'out' label to ensure iloc.bh is always released. Additionally, make ext4_fc_replay_inode() propagate errors properly instead of always returning 0.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ext4_fc_replay_inode函数在错误路径中未释放iloc.bh，可能导致资源泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-43066
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patch · 8
Same Patch Batch · Linux · 2026-05-05 · 15 CVEs total
| CVE-2026-43067 | 9.8 CRITICAL | ext4: handle wraparound when searching for blocks for indirect mapped blocks |
| CVE-2026-43071 | 9.1 CRITICAL | dcache: Limit the minimal number of bucket to two |
| CVE-2026-43070 | 7.8 HIGH | bpf: Reset register ID for BPF_END value tracking |
| CVE-2026-43063 | 7.8 HIGH | xfs: don't irele after failing to iget in xfs_attri_recover_work |
| CVE-2026-43060 | 7.8 HIGH | netfilter: nft_ct: drop pending enqueued packets on removal |
| CVE-2026-43062 | 7.1 HIGH | Bluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp() |
| CVE-2026-43073 | x86-64: rename misleadingly named '__copy_user_nocache()' function | |
| CVE-2026-43072 | drm/vc4: platform_get_irq_byname() returns an int | |
| CVE-2026-43069 | Bluetooth: hci_ll: Fix firmware leak on error path | |
| CVE-2026-43068 | ext4: avoid allocate block from corrupted group in ext4_mb_find_by_goal() | |
| CVE-2026-43065 | ext4: always drain queued discard work in ext4_mb_release() | |
| CVE-2026-43064 | dmaengine: idxd: Fix not releasing workqueue on .release() | |
| CVE-2026-43061 | serial: 8250: Fix TX deadlock when using DMA | |
| CVE-2026-43059 | Bluetooth: MGMT: Fix list corruption and UAF in command complete handlers |
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43502
net/rds: handle zerocopy send cleanup before the message is - CVE-2026-43501
ipv6: rpl: reserve mac_len headroom when recompressed SRH gr - CVE-2026-43498
accel/ivpu: Disallow re-exporting imported GEM objects - CVE-2026-43499
rtmutex: Use waiter::task instead of current in remove_waite - CVE-2026-43497
fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-aft
Same vendor: Linux
- CVE-2026-43502
net/rds: handle zerocopy send cleanup before the message is - CVE-2026-43501
ipv6: rpl: reserve mac_len headroom when recompressed SRH gr - CVE-2026-43498
accel/ivpu: Disallow re-exporting imported GEM objects - CVE-2026-43499
rtmutex: Use waiter::task instead of current in remove_waite - CVE-2026-43497
fbdev: udlfb: add vm_ops to dlfb_ops_mmap to prevent use-aft
V. Comments for CVE-2026-43066
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