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CVE-2026-63833— ntfs3: reject direct userspace writes to reserved $LX* xattrs

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ntfs3未能拒绝用户空间对保留的$LX* xattrs的直接写入，允许非特权用户在可写挂载点上设置根所有权和S_ISUID，从而在inode重载后获得euid 0。以下版本受到影响：5.15.211之前版本、6.1.177之前版本、6.6.144之前版本、6.12.95之前版本、6.18.38之前版本和7.1.3之前版本。

CVSS 7.1 · High EPSS 0.12% · P2

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux be71b5cba2e6485e8959da7a9f9a44461a1bb074< e574af95234afc3c725988bbc1fdeb46b9f386a4 affected
be71b5cba2e6485e8959da7a9f9a44461a1bb074< 2c3cd6da4a14380ef79e34bd9dff7caf46687477 affected
be71b5cba2e6485e8959da7a9f9a44461a1bb074< e8852ae29868e449fdb47eebc28f35fb80741a5f affected
be71b5cba2e6485e8959da7a9f9a44461a1bb074< f8d420949b335a4b51d06ab276beee6b8dfdc909 affected
be71b5cba2e6485e8959da7a9f9a44461a1bb074< 5e658b9245a52d838ef93729a7bc07de8e19deb7 affected
be71b5cba2e6485e8959da7a9f9a44461a1bb074< 293a84fa40b3a1b3471c0545722724bc10973f76 affected
be71b5cba2e6485e8959da7a9f9a44461a1bb074< 5b08dccecf825cbf905f348bc6ccb497507e28e2 affected
5.15 affected
… +8 more rows
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I. Basic Information for CVE-2026-63833

Vulnerability Information
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Vulnerability Title
ntfs3: reject direct userspace writes to reserved $LX* xattrs
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ntfs3: reject direct userspace writes to reserved $LX* xattrs NTFS3 uses $LXUID, $LXGID, $LXMOD and $LXDEV as internal WSL permission metadata and reloads them into i_uid, i_gid and i_mode from ntfs_get_wsl_perm(). Because the empty-prefix xattr handler also lets file owners call setxattr() on these names directly, an unprivileged writer on a writable ntfs3 mount can plant root ownership and S_ISUID on their own file and gain euid 0 after inode reload. Reject direct userspace writes to the reserved $LX* names. Internal ntfs3 metadata updates are unchanged because ntfs_save_wsl_perm() writes them via ntfs_set_ea() directly. [almaz.alexandrovich@paragon-software.com: added an additional check for non privileged users]
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于ntfs3未能拒绝用户空间对保留的$LX* xattrs的直接写入，允许非特权用户在可写挂载点上设置根所有权和S_ISUID，从而在inode重载后获得euid 0。以下版本受到影响：5.15.211之前版本、6.1.177之前版本、6.6.144之前版本、6.12.95之前版本、6.18.38之前版本和7.1.3之前版本。
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 be71b5cba2e6485e8959da7a9f9a44461a1bb074 ~ e574af95234afc3c725988bbc1fdeb46b9f386a4 -
Linux Linux 5.15 -

II. Public POCs for CVE-2026-63833

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III. Intelligence Information for CVE-2026-63833

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Patches & Fixes for CVE-2026-63833 (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-2026-63857 9.8 CRITICAL net: airoha: Do not read uninitialized fragment address in airoha_dev_xmit()
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-64102 9.8 CRITICAL RDMA/siw: Reject MPA FPDU length underflow before signed receive math
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans
CVE-2026-64162 9.8 CRITICAL idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init()
CVE-2026-64160 9.8 CRITICAL netfs: Fix potential for tearing in ->remote_i_size and ->zero_point
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-64055 9.8 CRITICAL net: ethernet: cortina: Carry over frag counter
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-64142 9.8 CRITICAL ksmbd: close durable scavenger races against m_fp_list lookups

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-2026-63833

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