UBUNTU-CVE-2025-68803
In the Linux kernel, the following vulnerability has been resolved: NFSD: NFSv4 file creation neglects setting ACL An NFSv4 client that sets an ACL with a named principal during file creation retrieves the ACL afterwards, and finds that it is only a default ACL (based on the mode bits) and not the ACL that was requested during file creation. This violates RFC 8881 section 6.4.1.3: "the ACL attribute is set as given". The issue occurs in nfsd_create_setattr(), which calls nfsd_attrs_valid() to determine whether to call nfsd_setattr(). However, nfsd_attrs_valid() checks only for iattr changes and security labels, but not POSIX ACLs. When only an ACL is present, the function returns false, nfsd_setattr() is skipped, and the POSIX ACL is never applied to the inode. Subsequently, when the client retrieves the ACL, the server finds no POSIX ACL on the inode and returns one generated from the file's mode bits rather than returning the originally-specified ACL.
02 / AFFECTED SOFTWARE
Affected packages
10 explicit affected versions
51 explicit affected versions
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38 explicit affected versions
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45 explicit affected versions
33 explicit affected versions
23 explicit affected versions
51 explicit affected versions
10 explicit affected versions
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3 explicit affected versions
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10 explicit affected versions
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35 explicit affected versions
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47 explicit affected versions
5 explicit affected versions
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10 explicit affected versions
7 explicit affected versions
43 explicit affected versions
13 explicit affected versions
13 explicit affected versions
7 explicit affected versions
8 explicit affected versions
10 explicit affected versions
12 explicit affected versions
9 explicit affected versions
30 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
45 explicit affected versions
37 explicit affected versions
48 explicit affected versions
14 explicit affected versions
38 explicit affected versions
9 explicit affected versions
12 explicit affected versions
11 explicit affected versions
36 explicit affected versions
17 explicit affected versions
9 explicit affected versions
83 explicit affected versions
8 explicit affected versions
7 explicit affected versions
4 explicit affected versions
72 explicit affected versions
3 explicit affected versions
1 explicit affected versions
81 explicit affected versions
72 explicit affected versions
71 explicit affected versions
13 explicit affected versions
43 explicit affected versions
9 explicit affected versions
10 explicit affected versions
8 explicit affected versions
42 explicit affected versions
14 explicit affected versions
4 explicit affected versions
78 explicit affected versions
9 explicit affected versions
11 explicit affected versions
1 explicit affected versions
16 explicit affected versions
37 explicit affected versions
71 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: NFSD: NFSv4 file creation neglects setting ACL An NFSv4 client that sets an ACL with a named principal during file creation retrieves the ACL afterwards, and finds that it is only a default ACL (based on the mode bits) and not the ACL that was requested during file creation. This violates RFC 8881 section 6.4.1.3: "the ACL attribute is set as given". The issue occurs in nfsd_create_setattr(), which calls nfsd_attrs_valid() to determine whether to call nfsd_setattr(). However, nfsd_attrs_valid() checks only for iattr changes and security labels, but not POSIX ACLs. When only an ACL is present, the function returns false, nfsd_setattr() is skipped, and the POSIX ACL is never applied to the inode. Subsequently, when the client retrieves the ACL, the server finds no POSIX ACL on the inode and returns one generated from the file's mode bits rather than returning the originally-specified ACL.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/913f7cf77bf14c13cfea70e89bcb6d0b22239562
- https://git.kernel.org/stable/c/214b396480061cbc8b16f2c518b2add7fbfa5192
- https://git.kernel.org/stable/c/60dbdef2ebc2317266a385e4debdb1bb0e57afe1
- https://git.kernel.org/stable/c/913f7cf77bf14c13cfea70e89bcb6d0b22239562
- https://git.kernel.org/stable/c/bf4e671c651534a307ab2fabba4926116beef8c3
- https://ubuntu.com/security/CVE-2025-68803
- https://ubuntu.com/security/notices/USN-8096-1
- https://ubuntu.com/security/notices/USN-8096-2
- https://ubuntu.com/security/notices/USN-8096-3
- https://ubuntu.com/security/notices/USN-8096-4
- https://ubuntu.com/security/notices/USN-8096-5
- https://ubuntu.com/security/notices/USN-8116-1
- https://ubuntu.com/security/notices/USN-8141-1
- https://ubuntu.com/security/notices/USN-8163-1
- https://ubuntu.com/security/notices/USN-8163-2
- https://ubuntu.com/security/notices/USN-8177-1
- https://ubuntu.com/security/notices/USN-8177-2
- https://ubuntu.com/security/notices/USN-8183-1
- https://ubuntu.com/security/notices/USN-8183-2
- https://ubuntu.com/security/notices/USN-8243-1
- https://ubuntu.com/security/notices/USN-8245-1
- https://ubuntu.com/security/notices/USN-8257-1
- https://ubuntu.com/security/notices/USN-8278-1
- https://ubuntu.com/security/notices/USN-8278-2
- https://ubuntu.com/security/notices/USN-8289-1
- https://ubuntu.com/security/notices/USN-8289-2
- https://ubuntu.com/security/notices/USN-8296-1
- https://ubuntu.com/security/notices/USN-8296-2
- https://ubuntu.com/security/notices/USN-8393-1
- https://ubuntu.com/security/notices/USN-8440-1
- https://ubuntu.com/security/notices/USN-8499-1
- https://www.cve.org/CVERecord?id=CVE-2025-68803