CVE-2026-93219

clocksource/drivers/timer-sun4i: Advertise a real minimum delta

Published Sep 24, 2026 CVSS n/a EPSS < 1% KEV · Not listed

Description

In the Linux kernel, the following vulnerability has been resolved:

clocksource/drivers/timer-sun4i: Advertise a real minimum delta

sun4i_clkevt_next_event() compensates for the timer stop/start
synchronization delay by programming evt - TIMER_SYNC_TICKS into the
hardware interval register. The clockevent device currently advertises
TIMER_SYNC_TICKS as min_delta_ticks, so the clockevents core is allowed
to call set_next_event() with evt == TIMER_SYNC_TICKS.

That programs a zero-tick interval. With oneshot/highres/nohz timer
operation this can leave the next event stuck, which was observed as a
boot hang on Allwinner D1 after the clockevents core started reusing
forced minimum-delta events.

Advertise one extra tick instead, so the smallest event accepted by the
core still programs at least one hardware tick after the synchronization
compensation.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`12e1480bcb4920c1b02b3793cb48756497919a60`	affected	< 0cc4b14d7401d50e53a01f1554147ee075ee6943
`12e1480bcb4920c1b02b3793cb48756497919a60`	affected	< 53a3bc024b8e5d284468cce84957cded5f859f98
`12e1480bcb4920c1b02b3793cb48756497919a60`	affected	< 753a220084dfc4d737f2ab9eaddc9a01a397edd7
`12e1480bcb4920c1b02b3793cb48756497919a60`	affected	< ebba4d0aeba0e8eb3a9676380fc2652de8ab1c44
`12e1480bcb4920c1b02b3793cb48756497919a60`	affected	< 151eb52f8712017c8f7b00bb2305e8916cb9e3dc
`12e1480bcb4920c1b02b3793cb48756497919a60`	affected	< bf38be01d43c4e4ca903aff7236d8486a950a252
`12e1480bcb4920c1b02b3793cb48756497919a60`	affected	< f0efafcdf6eec1f3361bfd8c811420198f55c8bb
`12e1480bcb4920c1b02b3793cb48756497919a60`	affected	< d21808328225ab8cee46885bf9a0dffcefbe630e

Linux

affected

Version	Status	Constraints
`3.13`	affected	—
`0`	unaffected	< 3.13
`5.10.270`	unaffected	≤ 5.10.*
`5.15.221`	unaffected	≤ 5.15.*
`6.1.188`	unaffected	≤ 6.1.*
`6.6.157`	unaffected	≤ 6.6.*
`6.12.109`	unaffected	≤ 6.12.*
`6.18.50`	unaffected	≤ 6.18.*
`7.2.4`	unaffected	≤ 7.2.*
`7.3`	unaffected	≤ *

No data.

Vendor Product Versions

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[12e1480bcb4920c1b02b3793cb48756497919a60,0cc4b14d7401d50e53a01f1554147ee075ee6943)`	affected	code_commit	—
`[12e1480bcb4920c1b02b3793cb48756497919a60,53a3bc024b8e5d284468cce84957cded5f859f98)`	affected	code_commit	—
`[12e1480bcb4920c1b02b3793cb48756497919a60,753a220084dfc4d737f2ab9eaddc9a01a397edd7)`	affected	code_commit	—
`[12e1480bcb4920c1b02b3793cb48756497919a60,ebba4d0aeba0e8eb3a9676380fc2652de8ab1c44)`	affected	code_commit	—
`[12e1480bcb4920c1b02b3793cb48756497919a60,151eb52f8712017c8f7b00bb2305e8916cb9e3dc)`	affected	code_commit	—
`[12e1480bcb4920c1b02b3793cb48756497919a60,bf38be01d43c4e4ca903aff7236d8486a950a252)`	affected	code_commit	—
`[12e1480bcb4920c1b02b3793cb48756497919a60,f0efafcdf6eec1f3361bfd8c811420198f55c8bb)`	affected	code_commit	—
`[12e1480bcb4920c1b02b3793cb48756497919a60,d21808328225ab8cee46885bf9a0dffcefbe630e)`	affected	code_commit	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`3.13`	affected	semver	—
`[0,3.13)`	unaffected	semver	—
`[5.10.270,5.11.0)`	unaffected	semver	—
`[5.15.221,5.16.0)`	unaffected	semver	—
`[6.1.188,6.2.0)`	unaffected	semver	—
`[6.6.157,6.7.0)`	unaffected	semver	—
`[6.12.109,6.13.0)`	unaffected	semver	—
`[6.18.50,6.19.0)`	unaffected	semver	—
`[7.2.4,7.3.0)`	unaffected	semver	—
`[7.3-rc1,*]`	unaffected	semver	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-4817-1	linux-6.12 security update
Debian DLA	DLA-4841-1	linux security update
Debian DSA	DSA-6528-1	linux security update
Ubuntu USN	USN-8961-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9019-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9020-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9022-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9023-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9024-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9025-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9026-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9029-1	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-9039-1	Linux kernel (Azure CVM) vulnerabilities
Ubuntu USN	USN-9040-1	Linux kernel (Low Latency NVIDIA) vulnerabilities
Ubuntu USN	USN-9066-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-9091-1	Linux kernel (NVIDIA Tegra) vulnerabilities

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.177% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/0cc4b14d7401d50e53a01f1554147ee075ee6943
https://git.kernel.org/stable/c/151eb52f8712017c8f7b00bb2305e8916cb9e3dc
https://git.kernel.org/stable/c/53a3bc024b8e5d284468cce84957cded5f859f98
https://git.kernel.org/stable/c/753a220084dfc4d737f2ab9eaddc9a01a397edd7
https://git.kernel.org/stable/c/bf38be01d43c4e4ca903aff7236d8486a950a252
https://git.kernel.org/stable/c/d21808328225ab8cee46885bf9a0dffcefbe630e
https://git.kernel.org/stable/c/ebba4d0aeba0e8eb3a9676380fc2652de8ab1c44
https://git.kernel.org/stable/c/f0efafcdf6eec1f3361bfd8c811420198f55c8bb

History

Sep 25, 2026 11:15 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-20 CWE-399

Sep 24, 2026 3:30 PM Description updated. Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references View changes

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: clocksource/drivers/timer-sun4i: Advertise a real minimum delta sun4i_clkevt_next_event() compensates for the timer stop/start synchronization delay by programming evt - TIMER_SYNC_TICKS into the hardware interval register. The clockevent device currently advertises TIMER_SYNC_TICKS as min_delta_ticks, so the clockevents core is allowed to call set_next_event() with evt == TIMER_SYNC_TICKS. That programs a zero-tick interval. With oneshot/highres/nohz timer operation this can leave the next event stuck, which was observed as a boot hang on Allwinner D1 after the clockevents core started reusing forced minimum-delta events. Advertise one extra tick instead, so the smallest event accepted by the core still programs at least one hardware tick after the synchronization compensation.
Title		clocksource/drivers/timer-sun4i: Advertise a real minimum delta
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/0cc4b14d7401d50e53a01f1554147ee075ee6943 https://git.kernel.org/stable/c/151eb52f8712017c8f7b00bb2305e8916cb9e3dc https://git.kernel.org/stable/c/53a3bc024b8e5d284468cce84957cded5f859f98 https://git.kernel.org/stable/c/753a220084dfc4d737f2ab9eaddc9a01a397edd7 https://git.kernel.org/stable/c/bf38be01d43c4e4ca903aff7236d8486a950a252 https://git.kernel.org/stable/c/d21808328225ab8cee46885bf9a0dffcefbe630e https://git.kernel.org/stable/c/ebba4d0aeba0e8eb3a9676380fc2652de8ab1c44 https://git.kernel.org/stable/c/f0efafcdf6eec1f3361bfd8c811420198f55c8bb