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CVE-2026-63818— f2fs: validate orphan inode entry count

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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于孤儿inode入口计数未经验证，可能导致从检查点包恢复孤儿inode时读取越界数据，挂载特制镜像可导致内核崩溃。

CVSS 8.4 · High EPSS 0.14% · P4

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 127e670abfa7fa150f6550d620ded930f5bdb4e7< 210c210c92d78fdf5051bc55c5c69044b1a2150a affected
127e670abfa7fa150f6550d620ded930f5bdb4e7< ad101d15716f5a24d1fa82a849f80430c805a3dd affected
127e670abfa7fa150f6550d620ded930f5bdb4e7< d18c81f5d0ecd5796aa47d66d98f2dd54d8d0f70 affected
127e670abfa7fa150f6550d620ded930f5bdb4e7< d2f236196d542ccd8505736e41c3a1d3f0305f6f affected
127e670abfa7fa150f6550d620ded930f5bdb4e7< 550511a2470f6d204fa07b331f048bd2d3c51280 affected
127e670abfa7fa150f6550d620ded930f5bdb4e7< 8aad54746c251f2c2370118df766c0c82e2d2091 affected
127e670abfa7fa150f6550d620ded930f5bdb4e7< 2e12381d4495dc8b0ff042c6856022b2e359835c affected
127e670abfa7fa150f6550d620ded930f5bdb4e7< 846c499a65816d13f1186e3090e825e8bb8bcb8b affected
… +10 more rows
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I. Basic Information for CVE-2026-63818

Vulnerability Information
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Vulnerability Title
f2fs: validate orphan inode entry count
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: f2fs: validate orphan inode entry count f2fs_recover_orphan_inodes() trusts the orphan block entry_count when replaying orphan inodes from the checkpoint pack. A corrupted entry_count larger than F2FS_ORPHANS_PER_BLOCK makes the recovery loop read past the ino[] array and interpret footer or following data as inode numbers. On a crafted image, mounting an unpatched kernel can drive orphan recovery into f2fs_bug_on() and panic the kernel. Validate entry_count before consuming entries so corrupted checkpoint data fails the mount with -EFSCORRUPTED and requests fsck instead. Set ERROR_INCONSISTENT_ORPHAN as well, so the corruption reason can be recorded in the superblock s_errors[] field. This gives fsck a persistent hint even though mount-time orphan recovery failure may leave no chance to persist SBI_NEED_FSCK through a checkpoint.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于孤儿inode入口计数未经验证，可能导致从检查点包恢复孤儿inode时读取越界数据，挂载特制镜像可导致内核崩溃。
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 127e670abfa7fa150f6550d620ded930f5bdb4e7 ~ 210c210c92d78fdf5051bc55c5c69044b1a2150a -
Linux Linux 3.8 -

II. Public POCs for CVE-2026-63818

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III. Intelligence Information for CVE-2026-63818

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Patches & Fixes for CVE-2026-63818 (7)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-63825 9.8 CRITICAL gcov: use atomic counter updates to fix concurrent access crashes
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-64055 9.8 CRITICAL net: ethernet: cortina: Carry over frag counter
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-64160 9.8 CRITICAL netfs: Fix potential for tearing in ->remote_i_size and ->zero_point
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-64150 9.8 CRITICAL netfilter: nft_inner: release local_lock before re-enabling softirqs
CVE-2026-64162 9.8 CRITICAL idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init()

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-63818

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