CVE-2025-21889

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  3. CVE-2025-21889

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

I

n the Linux kernel, the following vulnerability has been resolved: perf/core: Add RCU read lock protection to perf_iterate_ctx() The perf_iterate_ctx() function performs RCU list traversal but currently lacks RCU read lock protection. This causes lockdep warnings when running perf probe with unshare(1) under CONFIG_PROVE_RCU_LIST=y: WARNING: suspicious RCU usage kernel/events/core.c:8168 RCU-list traversed in non-reader section!! Call Trace: lockdep_rcu_suspicious ? perf_event_addr_filters_apply perf_iterate_ctx perf_event_exec begin_new_exec ? load_elf_phdrs load_elf_binary ? lock_acquire ? find_held_lock ? bprm_execve bprm_execve do_execveat_common.isra.0 __x64_sys_execve do_syscall_64 entry_SYSCALL_64_after_hwframe This protection was previously present but was removed in commit bd2756811766 ("perf: Rewrite core context handling"). Add back the necessary rcu_read_lock()/rcu_read_unlock() pair around perf_iterate_ctx() call in perf_event_exec(). [ mingo: Use scoped_guard() as suggested by Peter ]

References
Link Resource
https://git.kernel.org/stable/c/0fe8813baf4b2e865d3b2c735ce1a15b86002c74 Patch
https://git.kernel.org/stable/c/a2475ccad6120546ea45dbcd6cd1f74dc565ef6b Patch
https://git.kernel.org/stable/c/dd536566dda9a551fc2a2acfab5313a5bb13ed02 Patch
https://git.kernel.org/stable/c/f390c2eea571945f357a2d3b9fcb1c015767132e 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:6.14:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*
History

29 Oct 2025, 16:55

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CWE NVD-CWE-noinfo
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: perf/core: Añadir protección de bloqueo de lectura de RCU a perf_iterate_ctx(). La función perf_iterate_ctx() recorre la lista de RCU, pero actualmente carece de protección de bloqueo de lectura de RCU. Esto genera advertencias de lockdep al ejecutar perf probe con unshare(1) en CONFIG_PROVE_RCU_LIST=y: ADVERTENCIA: uso sospechoso de RCU kernel/events/core.c:8168 ¡Lista de RCU recorrida en la sección de no lectura! Rastreo de llamadas: lockdep_rcu_suspicious ? perf_event_addr_filters_apply perf_iterate_ctx perf_event_exec begin_new_exec ? load_elf_phdrs load_elf_binary ? lock_acquire ? find_held_lock ? bprm_execve bprm_execve do_execveat_common.isra.0 __x64_sys_execve do_syscall_64 entry_SYSCALL_64_after_hwframe Esta protección ya existía, pero se eliminó en la confirmación bd2756811766 ("perf: Reescribir la gestión del contexto principal"). Se ha añadido de nuevo el par necesario rcu_read_lock()/rcu_read_unlock() en la llamada a perf_iterate_ctx() en perf_event_exec(). [mingo: Usar scoped_guard() como sugirió Peter]
CPE cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/0fe8813baf4b2e865d3b2c735ce1a15b86002c74 - () https://git.kernel.org/stable/c/0fe8813baf4b2e865d3b2c735ce1a15b86002c74 - Patch
References () https://git.kernel.org/stable/c/a2475ccad6120546ea45dbcd6cd1f74dc565ef6b - () https://git.kernel.org/stable/c/a2475ccad6120546ea45dbcd6cd1f74dc565ef6b - Patch
References () https://git.kernel.org/stable/c/dd536566dda9a551fc2a2acfab5313a5bb13ed02 - () https://git.kernel.org/stable/c/dd536566dda9a551fc2a2acfab5313a5bb13ed02 - Patch
References () https://git.kernel.org/stable/c/f390c2eea571945f357a2d3b9fcb1c015767132e - () https://git.kernel.org/stable/c/f390c2eea571945f357a2d3b9fcb1c015767132e - Patch

27 Mar 2025, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-03-27 15:15

Updated : 2025-10-29 16:55

NVD link : CVE-2025-21889

Mitre link : CVE-2025-21889

CVE.ORG link : CVE-2025-21889

JSON object : View

Products Affected

linux

CWE
NVD-CWE-noinfo