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CVE-2024-33847— f2fs: compress: don't allow unaligned truncation on released compress inode

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，该漏洞源于存在未对齐截断损坏。

CVSS 7.1 · High EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1074 · Data Staged

Affected Version Matrix 13

VendorProduct Version RangeStatus
Linux Linux 8e1651cd667cd6779db28314844d88b6de8312a3< b8962cf98595d1ec62f40f23667de830567ec8bc affected
c61404153eb683da9c35aad133131554861ed561< 8acae047215024d1ac499b3c8337ef1b952f160b affected
c61404153eb683da9c35aad133131554861ed561< 3ccf5210dc941a7aa0180596ac021568be4d35ec affected
c61404153eb683da9c35aad133131554861ed561< 9f9341064a9b5246a32a7fe56b9f80c6f7f3c62d affected
c61404153eb683da9c35aad133131554861ed561< 5268241b41b1c5d0acca75e9b97d4fd719251c8c affected
c61404153eb683da9c35aad133131554861ed561< 29ed2b5dd521ce7c5d8466cd70bf0cc9d07afeee affected
5.14 affected
< 5.14 unaffected
… +5 more rows
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I. Basic Information for CVE-2024-33847

Vulnerability Information
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Vulnerability Title
f2fs: compress: don't allow unaligned truncation on released compress inode
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: f2fs: compress: don't allow unaligned truncation on released compress inode f2fs image may be corrupted after below testcase: - mkfs.f2fs -O extra_attr,compression -f /dev/vdb - mount /dev/vdb /mnt/f2fs - touch /mnt/f2fs/file - f2fs_io setflags compression /mnt/f2fs/file - dd if=/dev/zero of=/mnt/f2fs/file bs=4k count=4 - f2fs_io release_cblocks /mnt/f2fs/file - truncate -s 8192 /mnt/f2fs/file - umount /mnt/f2fs - fsck.f2fs /dev/vdb [ASSERT] (fsck_chk_inode_blk:1256) --> ino: 0x5 has i_blocks: 0x00000002, but has 0x3 blocks [FSCK] valid_block_count matching with CP [Fail] [0x4, 0x5] [FSCK] other corrupted bugs [Fail] The reason is: partial truncation assume compressed inode has reserved blocks, after partial truncation, valid block count may change w/o .i_blocks and .total_valid_block_count update, result in corruption. This patch only allow cluster size aligned truncation on released compress inode for fixing.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
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，该漏洞源于存在未对齐截断损坏。
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 8e1651cd667cd6779db28314844d88b6de8312a3 ~ b8962cf98595d1ec62f40f23667de830567ec8bc -
Linux Linux 5.14 -

II. Public POCs for CVE-2024-33847

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III. Intelligence Information for CVE-2024-33847

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Other References for CVE-2024-33847 (6)

Same Patch Batch · Linux · 2024-06-24 · 14 CVEs total

CVE-2024-38384 7.8 HIGH blk-cgroup: fix list corruption from reorder of WRITE ->lqueued
CVE-2024-38663 7.8 HIGH blk-cgroup: fix list corruption from resetting io stat
CVE-2024-39292 7.8 HIGH um: Add winch to winch_handlers before registering winch IRQ
CVE-2024-32936 7.8 HIGH media: ti: j721e-csi2rx: Fix races while restarting DMA
CVE-2024-34027 7.8 HIGH f2fs: compress: fix to cover {reserve,release}_compress_blocks() w/ cp_rwsem lock
CVE-2024-38664 drm: zynqmp_dpsub: Always register bridge
CVE-2024-38667 riscv: prevent pt_regs corruption for secondary idle threads
CVE-2024-39291 drm/amdgpu: Fix buffer size in gfx_v9_4_3_init_ cp_compute_microcode() and rlc_microcode()
CVE-2024-34030 PCI: of_property: Return error for int_map allocation failure
CVE-2024-35247 fpga: region: add owner module and take its refcount
CVE-2024-36479 fpga: bridge: add owner module and take its refcount
CVE-2024-37021 fpga: manager: add owner module and take its refcount
CVE-2024-37026 drm/xe: Only use reserved BCS instances for usm migrate exec queue

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-33847

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