CVE-2026-23168

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-23168
In the Linux kernel, the following vulnerability has been resolved: flex_proportions: make fprop_new_period() hardirq safe Bernd has reported a lockdep splat from flexible proportions code that is essentially complaining about the following race: <timer fires> run_timer_softirq - we are in softirq context call_timer_fn writeout_period fprop_new_period write_seqcount_begin(&p->sequence); <hardirq is raised> ... blk_mq_end_request() blk_update_request() ext4_end_bio() folio_end_writeback() __wb_writeout_add() __fprop_add_percpu_max() if (unlikely(max_frac < FPROP_FRAC_BASE)) { fprop_fraction_percpu() seq = read_seqcount_begin(&p->sequence); - sees odd sequence so loops indefinitely Note that a deadlock like this is only possible if the bdi has configured maximum fraction of writeout throughput which is very rare in general but frequent for example for FUSE bdis. To fix this problem we have to make sure write section of the sequence counter is irqsafe.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/0acc9ba7a1b5ba4d998c5753e709be904e179b75 Patch
https://git.kernel.org/stable/c/78ede9ebd679dadf480dce6f7b798e3603f88348 Patch
https://git.kernel.org/stable/c/884b2590ffcc7222cbbd6298051f4c243cc36f5d Patch
https://git.kernel.org/stable/c/b91a84299d72ae0e05551e851e47cd3008bd025b Patch
https://git.kernel.org/stable/c/dd9e2f5b38f1fdd49b1ab6d3a85f81c14369eacc Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*
History

18 Mar 2026, 15:00

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/0acc9ba7a1b5ba4d998c5753e709be904e179b75 - () https://git.kernel.org/stable/c/0acc9ba7a1b5ba4d998c5753e709be904e179b75 - Patch
References () https://git.kernel.org/stable/c/78ede9ebd679dadf480dce6f7b798e3603f88348 - () https://git.kernel.org/stable/c/78ede9ebd679dadf480dce6f7b798e3603f88348 - Patch
References () https://git.kernel.org/stable/c/884b2590ffcc7222cbbd6298051f4c243cc36f5d - () https://git.kernel.org/stable/c/884b2590ffcc7222cbbd6298051f4c243cc36f5d - Patch
References () https://git.kernel.org/stable/c/b91a84299d72ae0e05551e851e47cd3008bd025b - () https://git.kernel.org/stable/c/b91a84299d72ae0e05551e851e47cd3008bd025b - Patch
References () https://git.kernel.org/stable/c/dd9e2f5b38f1fdd49b1ab6d3a85f81c14369eacc - () https://git.kernel.org/stable/c/dd9e2f5b38f1fdd49b1ab6d3a85f81c14369eacc - Patch
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CPE cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*
CWE NVD-CWE-noinfo
First Time Linux
Linux linux Kernel

18 Feb 2026, 17:52

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: flex_proportions: hacer que fprop_new_period() sea seguro para hardirq Bernd ha reportado un lockdep splat del código de proporciones flexibles que esencialmente se queja de la siguiente condición de carrera: run_timer_softirq - estamos en contexto de softirq call_timer_fn writeout_period fprop_new_period write_seqcount_begin(&amp;p-&gt;sequence); ... blk_mq_end_request() blk_update_request() ext4_end_bio() folio_end_writeback() __wb_writeout_add() __fprop_add_percpu_max() if (unlikely(max_frac &lt; FPROP_FRAC_BASE)) { fprop_fraction_percpu() seq = read_seqcount_begin(&amp;p-&gt;sequence); - ve una secuencia impar por lo que entra en un bucle indefinido Tenga en cuenta que un interbloqueo como este solo es posible si el bdi ha configurado una fracción máxima de rendimiento de escritura, lo cual es muy raro en general pero frecuente, por ejemplo, para bdis FUSE. Para solucionar este problema, tenemos que asegurarnos de que la sección de escritura del contador de secuencia sea irqsafe.

14 Feb 2026, 16:15

Type Values Removed Values Added
New CVE
Information

Published : 2026-02-14 16:15

Updated : 2026-03-18 15:00

NVD link : CVE-2026-23168

Mitre link : CVE-2026-23168

CVE.ORG link : CVE-2026-23168

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo