Astra Linux – Vulnerability found in Linux 5.15, Linux 6.1

A flaw was discovered in the handling of SMB2 read requests within the kernel’s ksmbd module. The issue arises due to the lack of proper validation of user-provided data, which can lead to reading data beyond the end of an allocated buffer. An attacker can exploit this vulnerability to disclose...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: ksmbd: When a multichannel SMB2SESSIONSETUP request with SMB2SESSIONREQFLAGBINDING fails, ksmbd sets conn-binding = true, but never clears this value during the error path. As a result, the connection remains in a binding state,...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Use checkaddoverflow to prevent overflow of the u16 DACL size. The functions setposixaclentriesdacl and setntacldacl accumulate the ACE sizes in u16 variables. When a file has many POSIX ACL entries, the accumulated size c...

Astra Linux – Vulnerabilities in Linux 5.10, Linux 5.15, Linux 6.1

A flaw was discovered in the parsing of extended attributes in the kernel’s ksmbd module. The issue arises due to the lack of proper validation of user-provided data, which can lead to data being read beyond the end of an allocated buffer. An attacker can exploit this vulnerability to disclose...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Use the volume UUID in FSOBJECTIDINFORMATION. Use sb-suuid as the primary identifier for volumes. For file systems that do not provide a UUID, fallback to stfs.ffsid, which is obtained from vfsstatfs...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fixed a race condition between session lookup and expire operations. Thread A + Thread B ksmbdsessionlookup | smb2sesssetup sess = xaload | | | xaerase&conn-sessions, sess-id; | | ksmbdsessiondestroysess -- kfreesess | //...

Astra Linux – Vulnerability in Linux 5.15

A issue was discovered in the Linux kernel before version 6.3.8. In the file fs/smb/server/connection.c of ksmbd, the relationship between the length field of the NetBIOS header and the sizes of the SMB headers is not validated, as handled through the pdudsize function in ksmbdconnhandlerloop. Th...

Astra Linux – Vulnerability found in Linux 5.15, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: ksmbd: a out-of-bounds error in initsmb2rsphdr has been fixed. If a client sends a SMB2 negotiate request and then a SMB1 negotiate request, initsmb2rsphdr is called for the SMB1 negotiate request, since needneg is set to false...

Astra Linux – Vulnerability in Linux 5.15

A flaw was discovered in the ksmbd component of the Linux kernel, a high-performance in-kernel SMB server. The specific flaw resides in the handling of SMB2SESSIONSETUP commands. The problem arises due to a lack of control over resource consumption. An attacker can exploit this vulnerability to...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerabilities have been fixed: ksmbd: Fixed an out-of-bounds write issue in smb2getea. smb2getea applies a 4-byte alignment padding using memset after writing each EA entry. The bounds check on buffreelen is performed before the memcpy operation, but the...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Fixed the OOB write issue in QUERYINFO for compound requests. When a compound request such as READ + QUERYINFOSecurity is received, and the first command READ consumes most of the response buffer, ksmbd might write beyond...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Do not expire a session when a binding attempt fails. When a multichannel session binding request fails e.g., due to an incorrect password, the error handling mechanism sets sess-state to SMB2SESSIONEXPIRED unconditionally...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerabilities have been resolved: ksmbd: Fixed issues with use-after-free and NULL dereferencing in smbgrantoplock. smbgrantoplock has two issues in the oplock publication sequence: 1 opinfo is linked into ci-moplist via opinfoadd before addleasegloballist is...

Astra Linux – Vulnerability in Linux 5.15

A issue was discovered in the Linux kernel before version 6.3.9. ksmbd does not validate the SMB request protocol ID, resulting in an out-of-bounds read...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerabilities have been resolved: ksmbd: Fixed memory leaks and NULL dereferencing in smb2lock. smb2lock has three error handling issues after listdel detaches smblock from locklist at nocheckcl: 1 If vfslockfile returns an unexpected error in the non-UNLOCK...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: ksmbd: The use-after-free issue in smblazyparentleasebreakclose has been fixed. The opinfo pointer, which is obtained through rcudereferencefp-fopinfo, is accessed after rcureadunlock has been called. This creates a race conditio...

Astra Linux – Vulnerability in Linux 5.15

A flaw was discovered in the ksmbd component of the Linux kernel, a high-performance in-kernel SMB server. The specific flaw exists in the processing of SMB2LOGOFF and SMB2CLOSE commands. The issue arises from the lack of proper locking when performing operations on an object. An attacker can...

Astra Linux – Vulnerability in Linux 5.15

A issue was discovered in the Linux kernel before version 6.3.4. In the fs/ksmbd/connection.c file of ksmbd, there is an off-by-one error in memory allocation due to ksmbdsmb2checkmessage, which may lead to out-of-bounds access...

Astra Linux – Vulnerability in Linux 5.15

A flaw was discovered in the ksmbd component of the Linux kernel, a high-performance in-kernel SMB server. The specific flaw exists in the processing of SMB2SESSIONSETUP commands. The issue arises due to the lack of proper locking when performing operations on an object. An attacker can exploit...

Astra Linux – Vulnerability in Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: ksmbd: Corrected the incorrect validation of the next buffer length in smb2setea. There are multiple smb2eainfo buffers in the FILEFULLEAINFORMATION request from the client. ksmbd uses the NextEntryOffset of the current...