Integer Overflow or Wraparound Affecting kernel-64k-modules-core package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-CENTOS10-KERNEL64KMODULESCORE-19208641
- published23 Aug 2026
- disclosed15 Aug 2026
Introduced: 15 Aug 2026
NewCVE-2026-74504 (opens in a new tab)How to fix?
There is no fixed version for Centos:10 kernel-64k-modules-core.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-64k-modules-core package and not the kernel-64k-modules-core package as distributed by Centos.
See How to fix? for Centos:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
ALSA: seq: Fix division by zero in initialize_timer()
A userspace-driven ALSA timer (SND_UTIMER) lets an unprivileged user set the backing snd_timer's hardware resolution to an arbitrary 64-bit value via SNDRV_TIMER_IOCTL_CREATE. snd_utimer_create() only rejects zero.
When such a timer is bound to a sequencer queue, initialize_timer() computes the tick period as
tmr->ticks = 1000000000 / (r * freq);
where r is that user-controlled resolution and freq is the sequencer update rate in Hz, clamped to MIN_FREQUENCY..MAX_FREQUENCY (10..6250). A resolution of 2^63 makes the 64-bit product r * freq wrap to zero for any even freq, including DEFAULT_FREQUENCY (1000), so the division faults with a divide-by-zero.
The division runs under tmr->lock with interrupts disabled, so the oops leaves the spinlock held and hangs the CPU. It is reachable by an unprivileged user with access to /dev/snd/timer and /dev/snd/seq.
Oops: divide error: 0000 [#1] SMP KASAN PTI CPU: 7 UID: 1000 PID: 456 Comm: alsa_seq_utimer Not tainted 7.2.0-rc4+ RIP: 0010:initialize_timer.constprop.0+0x20a/0x2d0 snd_seq_timer_start+0x15e/0x2b0 snd_seq_control_queue+0x56f/0xba0 snd_seq_write+0x3e0/0x730
Reject an overflowing product with check_mul_overflow() and fall back to a single tick, which also avoids feeding a wrapped-but-nonzero divisor (e.g. 2^63 * 1000 mod 2^64 == 0, or other resolutions wrapping to a small value) into the period computation.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2516968
- https://access.redhat.com/security/cve/CVE-2026-74504
- https://git.kernel.org/stable/c/21e19688433452dfbbbe6b2bb670dea6eb92f0f6
- https://git.kernel.org/stable/c/42c6543ff27ea280334244458d4f52ec7133cc05
- https://git.kernel.org/stable/c/5260e195c53e898a4a76527d4bb2178f31795e78
- https://git.kernel.org/stable/c/d0e19932875746118e298b4c974f3b2d4aeb16fc