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CVE-2026-64187— xfs: fail recovery on a committed log item with no regions

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 4.3版本存在安全漏洞，该漏洞源于xfs日志恢复过程中，当事务的第一个操作是裸事务头时，xlog_recover_add_to_trans()添加了一个项目但未添加区域，导致ri_cnt为0且ri_buf为NULL，后续xlog_recover_reorder_trans()读取ri_buf[0]时触发空指针取消引用，可能允许攻击者通过特制日志导致拒绝服务。

AI Predicted 5.5 Difficulty: Theoretical EPSS 0.11% · P1

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 89cebc8477290b152618ffa110bbeae340d50900< 5105426424ad6981db827cc1ada835a488fab035 affected
89cebc8477290b152618ffa110bbeae340d50900< 226a3c8bea7163c39fe0a1c0ffc7ab7410ef3ba4 affected
89cebc8477290b152618ffa110bbeae340d50900< d0ae7ec3aa61db5140b107f0a63e017f63e56a96 affected
89cebc8477290b152618ffa110bbeae340d50900< d50b1fd066d66ceb548ba43e332cfe8a47e5e55a affected
89cebc8477290b152618ffa110bbeae340d50900< d98f22d2e11e0a36493aeb25b2933571ee90d9a4 affected
89cebc8477290b152618ffa110bbeae340d50900< cccbabeb9a18fcb978d76d6047f2b59214aa7749 affected
89cebc8477290b152618ffa110bbeae340d50900< 2094dab19d45c487285617b7b68913d0cc0c1211 affected
4.3 affected
… +8 more rows
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I. Basic Information for CVE-2026-64187

Vulnerability Information
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Vulnerability Title
xfs: fail recovery on a committed log item with no regions
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfs: fail recovery on a committed log item with no regions If the first op of a transaction is a bare transaction header (len == sizeof(struct xfs_trans_header)), xlog_recover_add_to_trans() adds an item but no region, leaving it on r_itemq with ri_cnt == 0 and ri_buf == NULL. The header can be split across op records, so later ops may still add regions; the item is only invalid if the transaction commits with none. The runtime commit path never emits such a transaction, so this only happens on a crafted log. It came from an AI-assisted code audit of the recovery parser. xlog_recover_reorder_trans() calls ITEM_TYPE() on the item, which reads *(unsigned short *)item->ri_buf[0].iov_base and faults on the NULL ri_buf. Reject it there, before the commit handlers that also read ri_buf[0]. KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:xlog_recover_reorder_trans (fs/xfs/xfs_log_recover.c:1836) xlog_recover_commit_trans (fs/xfs/xfs_log_recover.c:2043) xlog_recover_process_data (fs/xfs/xfs_log_recover.c:2501) xlog_do_recovery_pass (fs/xfs/xfs_log_recover.c:3244) xlog_recover (fs/xfs/xfs_log_recover.c:3493) xfs_log_mount (fs/xfs/xfs_log.c:618) xfs_mountfs (fs/xfs/xfs_mount.c:1034) xfs_fs_fill_super (fs/xfs/xfs_super.c:1938) vfs_get_tree (fs/super.c:1695) path_mount (fs/namespace.c:4161) __x64_sys_mount (fs/namespace.c:4367)
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基金会开源的一款操作系统内核。 Linux kernel 4.3版本存在安全漏洞，该漏洞源于xfs日志恢复过程中，当事务的第一个操作是裸事务头时，xlog_recover_add_to_trans()添加了一个项目但未添加区域，导致ri_cnt为0且ri_buf为NULL，后续xlog_recover_reorder_trans()读取ri_buf[0]时触发空指针取消引用，可能允许攻击者通过特制日志导致拒绝服务。
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 89cebc8477290b152618ffa110bbeae340d50900 ~ 5105426424ad6981db827cc1ada835a488fab035 -
Linux Linux 4.3 -

II. Public POCs for CVE-2026-64187

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III. Intelligence Information for CVE-2026-64187

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Patches & Fixes for CVE-2026-64187 (7)

Same Patch Batch · Linux · 2026-07-20 · 9 CVEs total

CVE-2026-64206 8.8 HIGH Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock
CVE-2026-64188 7.8 HIGH net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()
CVE-2026-64189 7.8 HIGH netfilter: ipset: fix race between dump and ip_set_list resize
CVE-2026-64191 7.8 HIGH i2c: stub: Reject I2C block transfers with invalid length
CVE-2026-64190 net: team: fix NULL pointer dereference in team_xmit during mode change
CVE-2026-64192 bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized
CVE-2026-64205 i2c: i801: fix hardware state machine corruption in error path
CVE-2026-64207 net/sched: dualpi2: fix GSO backlog accounting

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64187

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