------------------------------------------------------------------------- Debian LTS Advisory DLA-2557-1 debian-lts@lists.debian.org https://www.debian.org/lts/security/ Ben Hutchings February 12, 2021 https://wiki.debian.org/LTS ------------------------------------------------------------------------- Package : linux-4.19 Version : 4.19.171-2~deb9u1 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 Debian Bug : 970736 972345 977048 977615 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 in 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 by a 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. For Debian 9 stretch, these problems have been fixed in version 4.19.171-2~deb9u1. We recommend that you upgrade your linux-4.19 packages. For the detailed security status of linux-4.19 please refer to its security tracker page at: https://security-tracker.debian.org/tracker/linux-4.19 Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS -- Ben Hutchings Reality is just a crutch for people who can't handle science fiction.
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