It was discovered that aufs improperly managed inode reference counts in the vfsubdentryopen() method. A local attacker could use this vulnerability to cause a denial of service attack.

A use-after-free flaw was found in fs/ext4/namei.c:dxinsertblock() and a BUG() in fs/ext4/ext4.h:2057, It is tested on 4.14 and 5.16, it randomly got segmentation faults in either systemd or other libc functions after the bug is triggered twice or more with below traces.

================================================================== [ 99.129641] BUG: KASAN: use-after-free in dxinsertblock+0xf9/0x1e0 [ 99.129678] Read of size 199528 at addr ffff88825d339028 by task tmp32/1078

[ 99.129729] CPU: 3 PID: 1078 Comm: tmp32 Not tainted 5.4.171 #1 [ 99.129730] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014 [ 99.129731] Call Trace: [ 99.129734] dumpstack+0x8b/0xb9 [ 99.129736] ? dxinsertblock+0xf9/0x1e0 [ 99.129739] printaddressdescription.constprop.4+0x23/0x400 [ 99.129740] ? dxinsertblock+0xf9/0x1e0 [ 99.129742] kasanreport+0x15c/0x1e0 [ 99.129743] ? dxinsertblock+0xf9/0x1e0 [ 99.129744] kasanreport+0x10/0x20 [ 99.129746] checkmemoryregion+0x149/0x1a0 [ 99.129747] memmove+0x1f/0x50 [ 99.129748] dxinsertblock+0xf9/0x1e0 [ 99.129750] dosplit+0x105b/0x1bf0 [ 99.129754] ? ext4renamedirfinish+0x820/0x820 [ 99.129755] ext4dxaddentry+0x30b/0x2a20 [ 99.129757] ? condresched+0x15/0x30 [ 99.129759] ? getblkgfp+0x35/0x7f0 [ 99.129760] ? adddirenttobuf+0x630/0x630 [ 99.129761] ? memset+0x1f/0x40 [ 99.129763] ? fscryptsetupfilename+0x32/0xce0 [ 99.129765] ? ext4getblk+0x127/0x3d0 [ 99.129766] ? dosyscall64+0x9a/0x390 [ 99.129768] ? entrySYSCALL64afterhwframe+0x44/0xa9 [ 99.129769] ? ext4iomapbegin+0xf10/0xf10 [ 99.129771] ? addtransactioncredits+0x13d/0xaf0 [ 99.129772] ? memset+0x1f/0x40 [ 99.129773] ? ext4fnamesetupfilename+0xd1/0x1f0 [ 99.129775] ? memset+0x1f/0x40 [ 99.129776] ext4addentry+0x6c7/0xcd0 [ 99.129778] ? makeindexeddir+0x1130/0x1130 [ 99.129779] ? jbd2journalgetwriteaccess+0xaf/0x120 [ 99.129781] ? ext4journalgetwriteaccess+0x41/0x70 [ 99.129782] ? jbd2journalstart+0x2d6/0x760 [ 99.129784] ext4rename+0xef9/0x1e00 [ 99.129786] ? avchaspermnoaudit+0x1b3/0x380 [ 99.129787] ? ext4tmpfile+0x3a0/0x3a0 [ 99.129788] ? avchasextendedperms+0xe80/0xe80 [ 99.129790] ? selinuxpathnotify+0x460/0x460 [ 99.129792] vfsrename+0x84f/0x1550 [ 99.129794] ? tomoyocredprepare+0xb1/0x160 [ 99.129795] ? vfsmkdir+0x5a0/0x5a0 [ 99.129796] ? dalloc+0x56/0x210 [ 99.129797] ? dorenameat2+0x78a/0x970 [ 99.129798] dorenameat2+0x78a/0x970 [ 99.129800] ? userpathcreate+0x30/0x30 [ 99.129801] ? lockrefputreturn+0xd7/0x190 [ 99.129803] ? blkpreruntimesuspend+0x280/0x280 [ 99.129804] ? kmemcachealloc+0x177/0x220 [ 99.129805] ? mntgetcount+0x1e0/0x1e0 [ 99.129806] ? dput+0x5a/0x760 [ 99.129808] ? pathsetxattr+0xb9/0x130 [ 99.129809] ? setxattr+0x240/0x240 [ 99.129810] ? fgetlight+0x55/0x1f0 [ 99.129811] ? fgetlight+0x55/0x1f0 [ 99.129813] x64sysrename+0x5a/0x80 [ 99.129814] dosyscall64+0x9a/0x390 [ 99.129815] ? prepareexittousermode+0xec/0x1a0 [ 99.129817] entrySYSCALL64afterhwframe+0x44/0xa9 [ 99.129819] RIP: 0033:0x7f8665863639

An information disclosure via path traversal was discovered in apport/hookutils.py function readfile(). This issue affects: apport 2.14.1 versions prior to 2.14.1-0ubuntu3.29+esm8; 2.20.1 versions prior to 2.20.1-0ubuntu2.30+esm2; 2.20.9 versions prior to 2.20.9-0ubuntu7.26; 2.20.11 versions prior to 2.20.11-0ubuntu27.20; 2.20.11 versions prior to 2.20.11-0ubuntu65.3;

Function checkattachmentforerrors() in file data/general-hooks/ubuntu.py could be tricked into exposing private data via a constructed crash file. This issue affects: apport 2.14.1 versions prior to 2.14.1-0ubuntu3.29+esm8; 2.20.1 versions prior to 2.20.1-0ubuntu2.30+esm2; 2.20.9 versions prior to 2.20.9-0ubuntu7.26; 2.20.11 versions prior to 2.20.11-0ubuntu27.20; 2.20.11 versions prior to 2.20.11-0ubuntu65.3;

The unity-firefox-extension package could be tricked into destroying the Unity webapps context, causing Firefox to crash. This could be achieved by spinning the event loop inside the webapps initialization callback. Fixed in 3.0.0+14.04.20140416-0ubuntu1.14.04.1 by shipping an empty package, thus disabling the extension entirely.

The unity-firefox-extension package could be tricked into dropping a C callback which was still in use, which Firefox would then free, causing Firefox to crash. This could be achieved by adding an action to the launcher and updating it with new callbacks until the libunity-webapps rate limit was hit. Fixed in 3.0.0+14.04.20140416-0ubuntu1.14.04.1 of unity-firefox-extension and in all versions of libunity-webapps by shipping an empty unity-firefox-extension package, thus disabling the extension entirely and invalidating the attack against the libunity-webapps package.

Last updated 14 August 2026

An issue was discovered in domadvise in mm/madvise.c in the Linux kernel before 5.6.8. There is a race condition between coredump operations and the IORINGOPMADVISE implementation, aka CID-bc0c4d1e176e.

Fixed bug (PHP parses encoded cookie names so malicious Host- cookies can be sent). (CVE-2020-7070)

Fixed bug (Wrong ciphertext/tag in AES-CCM encryption for a 12 bytes IV). (CVE-2020-7069)

A missing CAPNETRAW check in NFC socket creation in net/nfc/rawsock.c in the Linux kernel before 5.8.2 could be used by local attackers to create raw sockets, bypassing security mechanisms, aka CID-26896f01467a.

An issue was discovered in the DBI module before 1.643 for Perl. The hvfetch() documentation requires checking for NULL and the code does that. But, shortly thereafter, it calls SvOK(profile), causing a NULL pointer dereference.

A flaw was found in the Linux kernels sysctl handling code for hugepages management. When multiple root level processes would write to modify the /proc/sys/vm/nrhugepages file it could create a race on internal variables leading to a system crash or memory corruption.

An issue was discovered in the DBI module before 1.632 for Perl. Using many arguments to methods for Callbacks may lead to memory corruption.

Last updated 25 August 2025

In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.

Integer overflows were discovered in the functions grubcmdinitrd and grubinitrdinit in the efilinux component of GRUB2, as shipped in Debian, Red Hat, and Ubuntu (the functionality is not included in GRUB2 upstream), leading to a heap-based buffer overflow. These could be triggered by an extremely large number of arguments to the initrd command on 32-bit architectures, or a crafted filesystem with very large files on any architecture. An attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions. This issue affects GRUB2 version 2.04 and prior versions.

"grub2 contains a use-after-free vulnerability which can be triggered by redefining a function whilst the same function is already executing."

GRUB2 fails to validate kernel signature when booted directly without shim, allowing secure boot to be bypassed. This only affects systems where the kernel signing certificate has been imported directly into the secure boot database and the GRUB image is booted directly without the use of shim. This issue affects GRUB2 version 2.04 and prior versions.

In the Linux kernel 4.4 through 5.7.6, usbtestdisconnect in drivers/usb/misc/usbtest.c has a memory leak, aka CID-28ebeb8db770.

A flaw was found in grub2. An expected font value is not verified before proceeding with buffer allocations allowing an attacker to use a malicious font file to create an arithmetic overflow, zero-sized allocation, and further heap-based buffer overflow. The highest threat from this vulnerability is to data integrity and system availability.

A flaw was found in grub2 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32MAX causes an arithmetic overflow, leading to a zero-sized memory allocation with a subsequent heap-based buffer overflow. The highest threat from this vulnerability is to integrity and system availability.

A vulnerability in the endpoint software of Cisco AMP for Endpoints and Clam AntiVirus could allow an authenticated, local attacker to cause the running software to delete arbitrary files on the system. The vulnerability is due to a race condition that could occur when scanning malicious files. An attacker with local shell access could exploit this vulnerability by executing a script that could trigger the race condition. A successful exploit could allow the attacker to delete arbitrary files on the system that the attacker would not normally have privileges to delete, producing system instability or causing the endpoint software to stop working.

An issue was discovered in LibVNCServer before 0.9.13. libvncserver/corre.c allows out-of-bounds access via encodings.

An issue was discovered in LibVNCServer before 0.9.13. libvncserver/hextile.c allows out-of-bounds access via encodings.

An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rre.c allows out-of-bounds access via encodings.

An issue was discovered in LibVNCServer before 0.9.13. libvncclient/rfbproto.c does not limit TextChat size.

An issue was discovered in dbus >= 1.3.0 before 1.12.18. The DBusServer in libdbus, as used in dbus-daemon, leaks file descriptors when a message exceeds the per-message file descriptor limit. A local attacker with access to the D-Bus system bus or another system service's private AFUNIX socket could use this to make the system service reach its file descriptor limit, denying service to subsequent D-Bus clients.

A memory out of bound read flaw was found in the Linux kernel's ext3/ext4 file system, in the way it accesses directory with broken indexing. This flaw allows a local user to crash the system if such directory exists.

go7007sndinit in drivers/media/usb/go7007/snd-go7007.c in the Linux kernel before 5.6 does not call sndcardfree for a failure path, which causes a memory leak, aka CID-9453264ef586.