CVE-2026-89711
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
NFSD: remove flawed WARN_ON_ONCE from nfsd_mode_check
In the Linux kernel, the following vulnerability has been resolved: NFSD: remove flawed WARN_ON_ONCE from nfsd_mode_check The header for commit e75b23f9e323 ("nfsd: check d_can_lookup in fh_verify of directories") details the assumption that justified adding the WARN_ON_ONCE to nfsd_mode_check(), that assumption is invalid (in the case of NFS reexport). When NFSD exports an NFS filesystem it is very possible for nfsd_mode_check() to encounter a @dentry that doesn't have i_op->lookup (see nfs_fhget()'s NFS_ATTR_FATTR_MOUNTPOINT and NFS_ATTR_FATTR_V4_REFERRAL handling, and d_flags_for_inode()). So remove nfsd_mode_check()'s WARN_ON_ONCE(). The nfserr_notdir return on that branch must stay. It guards the subsequent lookup_one_unlocked() -> __lookup_slow() path, which calls inode->i_op->lookup() with no NULL check, so returning nfserr_notdir is what keeps a client LOOKUP into such a @dentry from dereferencing a NULL method pointer.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c | affected | git | ae251937c6f0237e5b555a5e4ba4595b8206e865 | Unavailable | None listed |
| e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c | affected | git | e145e8d67a5d41c72d322e7f87ab474d39d9dfb7 | Unavailable | None listed |
| e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c | affected | git | 9f4434893a2783f7384d993cea883aff3fb7a52d | Unavailable | None listed |
| e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c | affected | git | 2ef131323999539038e306773c8256403834361b | Unavailable | None listed |
| e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c | affected | git | b55b4d880bb080fa10eb08ba21a5d8679b8102fe | Unavailable | None listed |
| e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c | affected | git | 7ef182a8fe9c12b0d936880b1e504840639aa009 | Unavailable | None listed |
| e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c | affected | git | a275de3bac5635514ca830f2e46b5ff0e66b5c4c | Unavailable | None listed |
| e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c | affected | git | aa0cf48a448c5a9fe1a1e880899ecd589ce39e6e | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4.8 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.8 | Unavailable | None listed |
| 5.10.270 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.221 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.188 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.157 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.109 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.50 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.2.4 | unaffected | semver | Unavailable | 7.2.* | None listed |
| 7.3 | unaffected | original_commit_for_fix | Unavailable | * | None listed |