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CVE-2026-43068— ext4: avoid allocate block from corrupted group in ext4_mb_find_by_goal()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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_mb_find_by_goal函数可能从损坏的组中分配块，可能导致数据丢失。

AI Predicted 7.8 Difficulty: Hard EPSS 0.16% · P5

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 163a203ddb36c36d4a1c942aececda0cc8d06aa7< fea6b2e250ff48f10d166011b57a8516ae5438c9 affected
163a203ddb36c36d4a1c942aececda0cc8d06aa7< 0b84571c886719823d537f05f4f07cad6357c4b7 affected
163a203ddb36c36d4a1c942aececda0cc8d06aa7< ffc0a282462d45fee5957621be5afa29752f3b6d affected
163a203ddb36c36d4a1c942aececda0cc8d06aa7< 2d31a5073f86a177edf44015e0dedb0c47cfd6d8 affected
163a203ddb36c36d4a1c942aececda0cc8d06aa7< 9370207b36d26e45a8c8ef0500706d37036edd6b affected
163a203ddb36c36d4a1c942aececda0cc8d06aa7< 1895f7904be71c48f1e6f338b28f24dabd6b8aeb affected
163a203ddb36c36d4a1c942aececda0cc8d06aa7< 1c0d7c4cde38a887c6d74e0c89ddb25226943c78 affected
163a203ddb36c36d4a1c942aececda0cc8d06aa7< 46066e3a06647c5b186cc6334409722622d05c44 affected
… +10 more rows
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I. Basic Information for CVE-2026-43068

Vulnerability Information
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Vulnerability Title
ext4: avoid allocate block from corrupted group in ext4_mb_find_by_goal()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ext4: avoid allocate block from corrupted group in ext4_mb_find_by_goal() There's issue as follows: ... EXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 206 at logical offset 0 with max blocks 1 with error 117 EXT4-fs (mmcblk0p1): This should not happen!! Data will be lost EXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 206 at logical offset 0 with max blocks 1 with error 117 EXT4-fs (mmcblk0p1): This should not happen!! Data will be lost EXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 206 at logical offset 0 with max blocks 1 with error 117 EXT4-fs (mmcblk0p1): This should not happen!! Data will be lost EXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 206 at logical offset 0 with max blocks 1 with error 117 EXT4-fs (mmcblk0p1): This should not happen!! Data will be lost EXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 2243 at logical offset 0 with max blocks 1 with error 117 EXT4-fs (mmcblk0p1): This should not happen!! Data will be lost EXT4-fs (mmcblk0p1): Delayed block allocation failed for inode 2239 at logical offset 0 with max blocks 1 with error 117 EXT4-fs (mmcblk0p1): This should not happen!! Data will be lost EXT4-fs (mmcblk0p1): error count since last fsck: 1 EXT4-fs (mmcblk0p1): initial error at time 1765597433: ext4_mb_generate_buddy:760 EXT4-fs (mmcblk0p1): last error at time 1765597433: ext4_mb_generate_buddy:760 ... According to the log analysis, blocks are always requested from the corrupted block group. This may happen as follows: ext4_mb_find_by_goal ext4_mb_load_buddy ext4_mb_load_buddy_gfp ext4_mb_init_cache ext4_read_block_bitmap_nowait ext4_wait_block_bitmap ext4_validate_block_bitmap if (!grp || EXT4_MB_GRP_BBITMAP_CORRUPT(grp)) return -EFSCORRUPTED; // There's no logs. if (err) return err; // Will return error ext4_lock_group(ac->ac_sb, group); if (unlikely(EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info))) // Unreachable goto out; After commit 9008a58e5dce ("ext4: make the bitmap read routines return real error codes") merged, Commit 163a203ddb36 ("ext4: mark block group as corrupt on block bitmap error") is no real solution for allocating blocks from corrupted block groups. This is because if 'EXT4_MB_GRP_BBITMAP_CORRUPT(e4b->bd_info)' is true, then 'ext4_mb_load_buddy()' may return an error. This means that the block allocation will fail. Therefore, check block group if corrupted when ext4_mb_load_buddy() returns error.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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_mb_find_by_goal函数可能从损坏的组中分配块，可能导致数据丢失。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 163a203ddb36c36d4a1c942aececda0cc8d06aa7 ~ fea6b2e250ff48f10d166011b57a8516ae5438c9 -
Linux Linux 3.12 -

II. Public POCs for CVE-2026-43068

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III. Intelligence Information for CVE-2026-43068

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Patches & Fixes for CVE-2026-43068 (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-2026-43066 ext4: fix iloc.bh leak in ext4_fc_replay_inode() error paths
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
Same vendor: Linux

V. Comments for CVE-2026-43068

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