Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or privilege escalation. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2009-1385     Neil Horman discovered a missing fix from the e1000     network driver. A remote user may cause a denial of     service by way of a kernel panic triggered by specially     crafted frame sizes.

  - CVE-2009-1389     Michael Tokarev discovered an issue in the r8169 network     driver. Remote users on the same LAN may cause a denial     of service by way of a kernel panic triggered by     receiving a large size frame.

  - CVE-2009-1630     Frank Filz discovered that local users may be able to     execute files without execute permission when accessed     via an nfs4 mount.

  - CVE-2009-1633     Jeff Layton and Suresh Jayaraman fixed several buffer     overflows in the CIFS filesystem which allow remote     servers to cause memory corruption.

  - CVE-2009-1895     Julien Tinnes and Tavis Ormandy reported an issue in the     Linux personality code. Local users can take advantage     of a setuid binary that can either be made to     dereference a NULL pointer or drop privileges and return     control to the user. This allows a user to bypass     mmap_min_addr restrictions which can be exploited to     execute arbitrary code.

  - CVE-2009-1914     Mikulas Patocka discovered an issue in sparc64 kernels     that allows local users to cause a denial of service     (crash) by reading the /proc/iomem file.

  - CVE-2009-1961     Miklos Szeredi reported an issue in the ocfs2     filesystem. Local users can create a denial of service     (filesystem deadlock) using a particular sequence of     splice system calls.

  - CVE-2009-2406 CVE-2009-2407     Ramon de Carvalho Valle discovered two issues with the     eCryptfs layered filesystem using the fsfuzzer utility.
    A local user with permissions to perform an eCryptfs     mount may modify the contents of a eCryptfs file,     overflowing the stack and potentially gaining elevated     privileges.

Igor Zhbanov discovered that NFS clients were able to create device nodes even when root_squash was enabled. An authenticated remote attacker could create device nodes with open permissions, leading to a loss of privacy or escalation of privileges. Only Ubuntu 8.10 and 9.04 were affected. (CVE-2009-1072)

Dan Carpenter discovered that SELinux did not correctly handle certain network checks when running with compat_net=1. A local attacker could exploit this to bypass network checks. Default Ubuntu installations do not enable SELinux, and only Ubuntu 8.10 and 9.04 were affected.
(CVE-2009-1184)

Shaohua Li discovered that memory was not correctly initialized in the AGP subsystem. A local attacker could potentially read kernel memory, leading to a loss of privacy. (CVE-2009-1192)

Benjamin Gilbert discovered that the VMX implementation of KVM did not correctly handle certain registers. An attacker in a guest VM could exploit this to cause a host system crash, leading to a denial of service. This only affected 32bit hosts. Ubuntu 6.06 was not affected.
(CVE-2009-1242)

Thomas Pollet discovered that the Amateur Radio X.25 Packet Layer Protocol did not correctly validate certain fields. A remote attacker could exploit this to read kernel memory, leading to a loss of privacy. (CVE-2009-1265)

Trond Myklebust discovered that NFS did not correctly handle certain long filenames. An authenticated remote attacker could exploit this to cause a system crash, leading to a denial of service. Only Ubuntu 6.06 was affected. (CVE-2009-1336)

Oleg Nesterov discovered that the kernel did not correctly handle CAP_KILL. A local user could exploit this to send signals to arbitrary processes, leading to a denial of service. (CVE-2009-1337)

Daniel Hokka Zakrisson discovered that signal handling was not correctly limited to process namespaces. A local user could bypass namespace restrictions, possibly leading to a denial of service. Only Ubuntu 8.04 was affected. (CVE-2009-1338)

Pavel Emelyanov discovered that network namespace support for IPv6 was not correctly handled. A remote attacker could send specially crafted IPv6 traffic that would cause a system crash, leading to a denial of service. Only Ubuntu 8.10 and 9.04 were affected. (CVE-2009-1360)

Neil Horman discovered that the e1000 network driver did not correctly validate certain fields. A remote attacker could send a specially crafted packet that would cause a system crash, leading to a denial of service. (CVE-2009-1385)

Pavan Naregundi discovered that CIFS did not correctly check lengths when handling certain mount requests. A remote attacker could send specially crafted traffic to cause a system crash, leading to a denial of service. (CVE-2009-1439)

Simon Vallet and Frank Filz discovered that execute permissions were not correctly handled by NFSv4. A local user could bypass permissions and run restricted programs, possibly leading to an escalation of privileges. (CVE-2009-1630)

Jeff Layton and Suresh Jayaraman discovered buffer overflows in the CIFS client code. A malicious remote server could exploit this to cause a system crash or execute arbitrary code as root.
(CVE-2009-1633)

Mikulas Patocka discovered that /proc/iomem was not correctly initialized on Sparc. A local attacker could use this file to crash the system, leading to a denial of service. Ubuntu 6.06 was not affected. (CVE-2009-1914)

Miklos Szeredi discovered that OCFS2 did not correctly handle certain splice operations. A local attacker could exploit this to cause a system hang, leading to a denial of service. Ubuntu 6.06 was not affected. (CVE-2009-1961).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Linux カーネルで、サービス拒否または権限昇格が発生する可能性があるいくつかの脆弱性が見つかりました。Common Vulnerabilities and Exposures プロジェクトは次の問題を特定しています：

- CVE-2009-1385 Neil Horman 氏が、e1000 ネットワークドライバーの修正がないことを発見しました。リモートユーザーが、特別に細工されたフレームサイズによってトリガーされるカーネルパニックを利用して、サービス拒否を発生させる可能性があります。

- CVE-2009-1389 Michael Tokarev 氏が、r8169 ネットワークドライバーの問題を発見しました。同じ LAN 上のリモートユーザーが、大きなサイズのフレームを受信することによってトリガーされるカーネルパニックを利用して、サービス拒否を発生させる可能性があります。

- CVE-2009-1630 Frank Filz 氏が、ローカルユーザーが nfs4 マウントを介してアクセスしたときに、実行権限のないファイルを実行できる可能性があることを発見しました。

- CVE-2009-1633 Jeff Layton 氏と Suresh Jayaraman 氏が、リモートユーザーがメモリを破損させる可能性がある CIFS ファイルシステムのいくつかのバッファオーバーフローを修正しました。

- CVE-2009-1895 Julien Tinnes 氏と Tavis Ormandy 氏が Linux パーソナリティコードの問題を報告しました。ローカルユーザーが、NULL ポインターを逆参照したり、権限をドロップしてコントロールをユーザーに返したりするために作成できる setuid バイナリを利用できる可能性があります。これにより、ユーザーが mmap_min_addr 制限のバイパスを利用して、任意のコードを実行できる可能性があります。

- CVE-2009-1914 Mikulas Patocka 氏は、sparc64 カーネルの問題を発見しました。これにより、ローカルユーザーが /proc/iomem ファイルを読み取ることで、サービス拒否（クラッシュ）を引き起こす可能性があります。

- CVE-2009-1961 Miklos Szeredi 氏は、ocfs2 ファイルシステムの問題を報告しました。ローカルユーザーが、特定のスプライスシステムコールのシーケンスを利用して、サービス拒否（ファイルシステムデッドロック）を引き起こす可能性があります。

- CVE-2009-2406 CVE-2009-2407 Ramon de Carvalho Valle 氏が、fsfuzzer ユーティリティを使用する eCryptfs レイヤーファイルシステムに 2 つの問題を発見しました。
 eCryptfs マウントを実行する権限を持つローカルユーザーが eCryptfsファイルの内容を変更し、スタックがオーバーフローして特権が昇格される可能性があります。

ID	名稱	產品	系列	已發布	已更新	嚴重性
44709	Debian DSA-1844-1 : linux-2.6.24 - denial of service/privilege escalation	Nessus	Debian Local Security Checks	2010/2/24	2021/1/4	high
39586	Ubuntu 6.06 LTS / 8.04 LTS / 8.10 / 9.04 : linux, linux-source-2.6.15 vulnerabilities (USN-793-1)	Nessus	Ubuntu Local Security Checks	2009/7/2	2021/1/19	high
44709	Debian DSA-1844-1：linux-2.6.24 - サービス拒否/権限昇格	Nessus	Debian Local Security Checks	2010/2/24	2021/1/4	high

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