SUSE: CVE-2021-4439: SUSE Linux Security Advisory

SUSE: CVE-2021-4439: SUSE Linux Security Advisory

Severity

7

CVSS

(AV:L/AC:L/Au:S/C:C/I:C/A:C)

Published

06/20/2024

Created

08/16/2024

Added

08/09/2024

Modified

01/28/2025

Description

In the Linux kernel, the following vulnerability has been resolved: isdn: cpai: check ctr->cnr to avoid array index out of bound The cmtp_add_connection() would add a cmtp session to a controller and run a kernel thread to process cmtp. __module_get(THIS_MODULE); session->task = kthread_run(cmtp_session, session, "kcmtpd_ctr_%d", session->num); During this process, the kernel thread would call detach_capi_ctr() to detach a register controller. if the controller was not attached yet, detach_capi_ctr() would trigger an array-index-out-bounds bug. [ 46.866069][ T6479] UBSAN: array-index-out-of-bounds in drivers/isdn/capi/kcapi.c:483:21 [ 46.867196][ T6479] index -1 is out of range for type 'capi_ctr *[32]' [ 46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpd_ctr_0 Not tainted 5.15.0-rc2+ #8 [ 46.869002][ T6479] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014 [ 46.870107][ T6479] Call Trace: [ 46.870473][ T6479]dump_stack_lvl+0x57/0x7d [ 46.870974][ T6479]ubsan_epilogue+0x5/0x40 [ 46.871458][ T6479]__ubsan_handle_out_of_bounds.cold+0x43/0x48 [ 46.872135][ T6479]detach_capi_ctr+0x64/0xc0 [ 46.872639][ T6479]cmtp_session+0x5c8/0x5d0 [ 46.873131][ T6479]? __init_waitqueue_head+0x60/0x60 [ 46.873712][ T6479]? cmtp_add_msgpart+0x120/0x120 [ 46.874256][ T6479]kthread+0x147/0x170 [ 46.874709][ T6479]? set_kthread_struct+0x40/0x40 [ 46.875248][ T6479]ret_from_fork+0x1f/0x30 [ 46.875773][ T6479]

Solution(s)

• suse-upgrade-cluster-md-kmp-azure
• suse-upgrade-cluster-md-kmp-rt
• suse-upgrade-dlm-kmp-azure
• suse-upgrade-dlm-kmp-rt
• suse-upgrade-gfs2-kmp-azure
• suse-upgrade-gfs2-kmp-rt
• suse-upgrade-kernel-64kb
• suse-upgrade-kernel-64kb-devel
• suse-upgrade-kernel-azure
• suse-upgrade-kernel-azure-base
• suse-upgrade-kernel-azure-devel
• suse-upgrade-kernel-azure-extra
• suse-upgrade-kernel-azure-livepatch-devel
• suse-upgrade-kernel-azure-optional
• suse-upgrade-kernel-azure-vdso
• suse-upgrade-kernel-default
• suse-upgrade-kernel-default-base
• suse-upgrade-kernel-default-devel
• suse-upgrade-kernel-default-extra
• suse-upgrade-kernel-default-man
• suse-upgrade-kernel-devel
• suse-upgrade-kernel-devel-azure
• suse-upgrade-kernel-devel-rt
• suse-upgrade-kernel-docs
• suse-upgrade-kernel-macros
• suse-upgrade-kernel-obs-build
• suse-upgrade-kernel-preempt
• suse-upgrade-kernel-preempt-devel
• suse-upgrade-kernel-rt
• suse-upgrade-kernel-rt-devel
• suse-upgrade-kernel-rt-extra
• suse-upgrade-kernel-rt-livepatch
• suse-upgrade-kernel-rt-livepatch-devel
• suse-upgrade-kernel-rt-optional
• suse-upgrade-kernel-rt-vdso
• suse-upgrade-kernel-rt_debug
• suse-upgrade-kernel-rt_debug-devel
• suse-upgrade-kernel-rt_debug-livepatch-devel
• suse-upgrade-kernel-rt_debug-vdso
• suse-upgrade-kernel-source
• suse-upgrade-kernel-source-azure
• suse-upgrade-kernel-source-rt
• suse-upgrade-kernel-syms
• suse-upgrade-kernel-syms-azure
• suse-upgrade-kernel-syms-rt
• suse-upgrade-kernel-zfcpdump
• suse-upgrade-kselftests-kmp-azure
• suse-upgrade-kselftests-kmp-rt
• suse-upgrade-ocfs2-kmp-azure
• suse-upgrade-ocfs2-kmp-rt
• suse-upgrade-reiserfs-kmp-azure
• suse-upgrade-reiserfs-kmp-default
• suse-upgrade-reiserfs-kmp-rt

References

• https://attackerkb.com/topics/cve-2021-4439
• CVE - 2021-4439