This bug was fixed in the package linux - 5.4.0-113.127 --------------- linux (5.4.0-113.127) focal; urgency=medium
* focal/linux: 5.4.0-113.127 -proposed tracker (LP: #1973980) * CVE-2022-29581 - net/sched: cls_u32: fix netns refcount changes in u32_change() * CVE-2022-1116 - io_uring: fix fs->users overflow * ext4: limit length to bitmap_maxbytes (LP: #1972281) - ext4: limit length to bitmap_maxbytes - blocksize in punch_hole * Unprivileged users may use PTRACE_SEIZE to set PTRACE_O_SUSPEND_SECCOMP option (LP: #1972740) - ptrace: Check PTRACE_O_SUSPEND_SECCOMP permission on PTRACE_SEIZE -- Stefan Bader <stefan.ba...@canonical.com> Wed, 18 May 2022 16:07:54 +0200 ** Changed in: linux (Ubuntu Impish) Status: Fix Committed => Fix Released -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1972740 Title: Unprivileged users may use PTRACE_SEIZE to set PTRACE_O_SUSPEND_SECCOMP option Status in linux package in Ubuntu: Fix Committed Status in linux source package in Xenial: Triaged Status in linux source package in Bionic: Fix Released Status in linux source package in Focal: Fix Released Status in linux source package in Impish: Fix Released Status in linux source package in Jammy: Fix Released Bug description: [Impact] PTRACE_O_SUSPEND_SECCOMP allows CRIU to disable seccomp on a process. However, setting this option requires privilege when used with PTRACE_SETOPTIONS. However, when used with PTRACE_SEIZE, no privilege is required. This allows sandboxed processes to exit the sandbox if they are allowed to use ptrace. [Test case] Run the reproducer from https://bugs.chromium.org/p/project-zero/issues/detail?id=2276. [Potential regression] This may break ptrace users, specially ones using PTRACE_SEIZE or PTRACE_SETOPTIONS. Special attention to processes being sandboxed with seccomp. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1972740/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp