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Vulnerability details: VCID-2cky-e16g-yqgf
Vulnerability ID VCID-2cky-e16g-yqgf
Aliases CVE-2026-31602
Summary In the Linux kernel, the following vulnerability has been resolved: ALSA: ctxfi: Limit PTP to a single page Commit 391e69143d0a increased CT_PTP_NUM from 1 to 4 to support 256 playback streams, but the additional pages are not used by the card correctly. The CT20K2 hardware already has multiple VMEM_PTPAL registers, but using them separately would require refactoring the entire virtual memory allocation logic. ct_vm_map() always uses PTEs in vm->ptp[0].area regardless of CT_PTP_NUM. On AMD64 systems, a single PTP covers 512 PTEs (2M). When aggregate memory allocations exceed this limit, ct_vm_map() tries to access beyond the allocated space and causes a page fault: BUG: unable to handle page fault for address: ffffd4ae8a10a000 Oops: Oops: 0002 [#1] SMP PTI RIP: 0010:ct_vm_map+0x17c/0x280 [snd_ctxfi] Call Trace: atc_pcm_playback_prepare+0x225/0x3b0 ct_pcm_playback_prepare+0x38/0x60 snd_pcm_do_prepare+0x2f/0x50 snd_pcm_action_single+0x36/0x90 snd_pcm_action_nonatomic+0xbf/0xd0 snd_pcm_ioctl+0x28/0x40 __x64_sys_ioctl+0x97/0xe0 do_syscall_64+0x81/0x610 entry_SYSCALL_64_after_hwframe+0x76/0x7e Revert CT_PTP_NUM to 1. The 256 SRC_RESOURCE_NUM and playback_count remain unchanged.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk None
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-788 Access of Memory Location After End of Buffer
System Score Found at
epss 0.00018 https://api.first.org/data/v1/epss?cve=CVE-2026-31602
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-31602.json
https://api.first.org/data/v1/epss?cve=CVE-2026-31602
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-31602
2461507 https://bugzilla.redhat.com/show_bug.cgi?id=2461507
No exploits are available.
There are no known vectors.
Exploit Prediction Scoring System (EPSS)
Percentile 0.0462
EPSS Score 0.00018
Published At April 26, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-25T23:21:32.661212+00:00 Debian Importer Import https://security-tracker.debian.org/tracker/data/json 38.4.0