Add draft text for 4.19.171-2 based DSA

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+Package: linux
+CVE ID: CVE-2020-27815 CVE-2020-27825 CVE-2020-27830 CVE-2020-28374 CVE-2020-29568 CVE-2020-29569 CVE-2020-29660 CVE-2020-29661 CVE-2020-36158 CVE-2021-3347 CVE-2021-20177
+
+Several vulnerabilities have been discovered in the Linux kernel that
+may lead to a privilege escalation, denial of service or information
+leaks.
+
+CVE-2020-27815
+
+    A flaw was reported in the JFS filesystem code allowing a local
+    attacker with the ability to set extended attributes to cause a
+    denial of service.
+
+CVE-2020-27825
+
+    Adam 'pi3' Zabrocki reported a use-after-free flaw the ftrace ring
+    buffer resizing logic due to a race condition, which could result in
+    denial of service or information leak.
+
+CVE-2020-27830
+
+    Shisong Qin reported a NULL pointer dereference flaw in the Speakup
+    screen reader core driver.
+
+CVE-2020-28374
+
+    David Disseldorp discovered that the LIO SCSI target implementation
+    performed insufficient checking in certain XCOPY requests. An
+    attacker with access to a LUN and knowledge of Unit Serial Number
+    assignments can take advantage of this flaw to read and write to any
+    LIO backstore, regardless of the SCSI transport settings.
+
+CVE-2020-29568 (XSA-349)
+
+    Michael Kurth and Pawel Wieczorkiewicz reported that frontends can
+    trigger OOM in backends by updating a watched path.
+    
+CVE-2020-29569 (XSA-350)
+
+    Olivier Benjamin and Pawel Wieczorkiewicz reported a use-after-free
+    flaw which can be triggered block frontend in Linux blkback. A
+    misbehaving guest can trigger a dom0 crash by continuously
+    connecting / disconnecting a block frontend.
+
+CVE-2020-29660
+
+    Jann Horn reported a locking inconsistency issue in the tty
+    subsystem which may allow a local attacker to mount a
+    read-after-free attack against TIOCGSID.
+
+CVE-2020-29661
+
+    Jann Horn reported a locking issue in the tty subsystem which
+    can result in a use-after-free. A local attacker can take
+    advantage of this flaw for memory corruption or privilege
+    escalation.
+
+CVE-2020-36158
+
+    A buffer overflow flaw was discovered in the mwifiex WiFi driver
+    which could result in denial of service or the execution of
+    arbitrary code via a long SSID value.
+
+CVE-2021-3347
+
+    It was discovered that PI futexes have a kernel stack use-after-free
+    during fault handling. An unprivileged user could use this flaw to
+    crash the kernel (resulting in denial of service) or for privilege
+    escalation.
+
+CVE-2021-20177
+
+    A flaw was discovered in the Linux implementation of string matching
+    within a packet. A privileged user (with root or CAP_NET_ADMIN) can
+    take advantage of this flaw to cause a kernel panic when inserting
+    iptables rules.
+
+Do not list CVE-2021-3178 for DSA but add directly to data/CVE/list (as
+unimportant severity and disputed, but just track the fix).
+
+CVE-2021-3178
+        [buster] - linux 4.19.171-1