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]
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | Jun 20, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jun 20, 2024 |
| Suse | — | Upgrade kernel-obs-buildUpgrade kernel-rt-vdsoUpgrade ocfs2-kmp-rtUpgrade kernel-default-manUpgrade kernel-devel-azureUpgrade reiserfs-kmp-azureUpgrade kernel-rt-livepatch-develUpgrade kernel-default-extraUpgrade kernel-64kbUpgrade kernel-rt-extraUpgrade gfs2-kmp-rtUpgrade dlm-kmp-azureUpgrade kernel-azure-baseUpgrade kernel-source-azureUpgrade kernel-azure-livepatch-develUpgrade kernel-azure-develUpgrade kernel-zfcpdumpUpgrade cluster-md-kmp-azureUpgrade kernel-source-rtUpgrade kernel-macrosUpgrade kernel-syms-rtUpgrade kernel-azure-vdsoUpgrade kernel-preemptUpgrade kselftests-kmp-azureUpgrade kernel-rtUpgrade kernel-sourceUpgrade kernel-syms-azureUpgrade kernel-rt_debug-vdsoUpgrade kernel-rt-optionalUpgrade kernel-64kb-develUpgrade cluster-md-kmp-rtUpgrade kernel-rt_debugUpgrade kernel-rt-develUpgrade kernel-azureUpgrade reiserfs-kmp-rtUpgrade kernel-defaultUpgrade kernel-rt-livepatchUpgrade kernel-default-baseUpgrade kernel-develUpgrade kernel-devel-rtUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-rt_debug-develUpgrade kernel-preempt-develUpgrade dlm-kmp-rtUpgrade kernel-azure-optionalUpgrade kselftests-kmp-rtUpgrade gfs2-kmp-azureUpgrade ocfs2-kmp-azureUpgrade kernel-symsUpgrade reiserfs-kmp-defaultUpgrade kernel-azure-extraUpgrade kernel-docsUpgrade kernel-default-devel | Aug 9, 2024 | Jun 20, 2024 |
| Ubuntu | — | Upgrade linux-gcp-4.15Upgrade linux-gcp-5.4Upgrade linux-aws-fipsUpgrade linux-lts-xenialUpgrade linux-gkeopUpgrade linuxUpgrade linux-hweUpgrade linux-ibmUpgrade linux-azure-fde-5.15Upgrade linux-hwe-5.4Upgrade linux-azure-fipsUpgrade linux-aws-hweUpgrade linux-gcp-fipsUpgrade linux-oracleUpgrade linux-azure-4.15Upgrade linux-aws-5.4Upgrade linux-raspiUpgrade linux-gcpUpgrade linux-raspi-5.4Upgrade linux-awsUpgrade linux-bluefieldUpgrade linux-azureUpgrade linux-oracle-5.4Upgrade linux-azure-5.4Upgrade linux-kvmUpgrade linux-fips | Nov 19, 2024 | Jun 20, 2024 |
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