CVE-2025-22035

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix use-after-free in print_graph_function_flags during tracer switching Kairui reported a UAF issue in print_graph_function_flags() during ftrace stress testing [1]. This issue can be reproduced if puting a 'mdelay(10)' after 'mutex_unlock(&trace_types_lock)' in s_start(), and executing the following script: $ echo function_graph > current_tracer $ cat trace > /dev/null & $ sleep 5 # Ensure the 'cat' reaches the 'mdelay(10)' point $ echo timerlat > current_tracer The root cause lies in the two calls to print_graph_function_flags within print_trace_line during each s_show(): * One through 'iter->trace->print_line()'; * Another through 'event->funcs->trace()', which is hidden in print_trace_fmt() before print_trace_line returns. Tracer switching only updates the former, while the latter continues to use the print_line function of the old tracer, which in the script above is print_graph_function_flags. Moreover, when switching from the 'function_graph' tracer to the 'timerlat' tracer, s_start only calls graph_trace_close of the 'function_graph' tracer to free 'iter->private', but does not set it to NULL. This provides an opportunity for 'event->funcs->trace()' to use an invalid 'iter->private'. To fix this issue, set 'iter->private' to NULL immediately after freeing it in graph_trace_close(), ensuring that an invalid pointer is not passed to other tracers. Additionally, clean up the unnecessary 'iter->private = NULL' during each 'cat trace' when using wakeup and irqsoff tracers. [1] https://lore.kernel.org/all/20231112150030.84609-1-ryncsn@gmail.com/

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/099ef3385800828b74933a96c117574637c3fb3a	Patch
https://git.kernel.org/stable/c/42561fe62c3628ea3bc9623f64f047605e98857f	Patch
https://git.kernel.org/stable/c/70be951bc01e4a0e10d443f3510bb17426f257fb	Patch
https://git.kernel.org/stable/c/7f81f27b1093e4895e87b74143c59c055c3b1906	Patch
https://git.kernel.org/stable/c/81a85b12132c8ffe98f5ddbdc185481790aeaa1b	Patch
https://git.kernel.org/stable/c/a2cce54c1748216535dda02e185d07a084be837e	Patch
https://git.kernel.org/stable/c/c85efe6e13743cac6ba4ccf144cb91f44c86231a	Patch
https://git.kernel.org/stable/c/de7b309139f862a44379ecd96e93c9133c69f813	Patch
https://git.kernel.org/stable/c/f14752d66056d0c7bffe5092130409417d3baa70	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::::::::
	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::::::::

History

25 Apr 2025, 18:43

Type	Values Removed	Values Added
CPE		cpe:2.3:o:linux:linux_kernel::::::::
First Time		Linux linux Kernel Linux
References	~~() https://git.kernel.org/stable/c/099ef3385800828b74933a96c117574637c3fb3a -~~	() https://git.kernel.org/stable/c/099ef3385800828b74933a96c117574637c3fb3a - Patch
References	~~() https://git.kernel.org/stable/c/42561fe62c3628ea3bc9623f64f047605e98857f -~~	() https://git.kernel.org/stable/c/42561fe62c3628ea3bc9623f64f047605e98857f - Patch
References	~~() https://git.kernel.org/stable/c/70be951bc01e4a0e10d443f3510bb17426f257fb -~~	() https://git.kernel.org/stable/c/70be951bc01e4a0e10d443f3510bb17426f257fb - Patch
References	~~() https://git.kernel.org/stable/c/7f81f27b1093e4895e87b74143c59c055c3b1906 -~~	() https://git.kernel.org/stable/c/7f81f27b1093e4895e87b74143c59c055c3b1906 - Patch
References	~~() https://git.kernel.org/stable/c/81a85b12132c8ffe98f5ddbdc185481790aeaa1b -~~	() https://git.kernel.org/stable/c/81a85b12132c8ffe98f5ddbdc185481790aeaa1b - Patch
References	~~() https://git.kernel.org/stable/c/a2cce54c1748216535dda02e185d07a084be837e -~~	() https://git.kernel.org/stable/c/a2cce54c1748216535dda02e185d07a084be837e - Patch
References	~~() https://git.kernel.org/stable/c/c85efe6e13743cac6ba4ccf144cb91f44c86231a -~~	() https://git.kernel.org/stable/c/c85efe6e13743cac6ba4ccf144cb91f44c86231a - Patch
References	~~() https://git.kernel.org/stable/c/de7b309139f862a44379ecd96e93c9133c69f813 -~~	() https://git.kernel.org/stable/c/de7b309139f862a44379ecd96e93c9133c69f813 - Patch
References	~~() https://git.kernel.org/stable/c/f14752d66056d0c7bffe5092130409417d3baa70 -~~	() https://git.kernel.org/stable/c/f14752d66056d0c7bffe5092130409417d3baa70 - Patch

21 Apr 2025, 15:15

Type	Values Removed	Values Added
CWE		CWE-416
Summary		(es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tracing: Fix use-after-free en print_graph_function_flags durante el cambio de tracer Kairui informó de un problema de UAF en print_graph_function_flags() durante las pruebas de estrés de ftrace [1]. Este problema se puede reproducir si se pone un 'mdelay(10)' después de 'mutex_unlock(&trace_types_lock)' en s_start() y se ejecuta el siguiente script: $ echo function_graph > current_tracer $ cat trace > /dev/null & $ sleep 5 # Asegurarse de que 'cat' alcance el punto 'mdelay(10)' $ echo timerlat > current_tracer La causa raíz se encuentra en las dos llamadas a print_graph_function_flags dentro de print_trace_line durante cada s_show(): * Una a través de 'iter->trace->print_line()'; * Otra función mediante 'event->funcs->trace()', que está oculta en print_trace_fmt() antes del retorno de print_trace_line. Al cambiar de trazador, solo se actualiza el primero, mientras que el segundo continúa usando la función print_line del trazador anterior, que en el script anterior es print_graph_function_flags. Además, al cambiar del trazador 'function_graph' al trazador 'timerlat', s_start solo llama a graph_trace_close del trazador 'function_graph' para liberar 'iter->private', pero no lo establece en NULL. Esto permite que 'event->funcs->trace()' use un 'iter->private' no válido. Para solucionar este problema, establezca 'iter->private' en NULL inmediatamente después de liberarlo en graph_trace_close(), lo que garantiza que no se pase un puntero no válido a otros trazadores. Además, limpie el 'iter->private = NULL' innecesario durante cada 'cat trace' al usar los trazadores wakeup e irqsoff. [1] https://lore.kernel.org/all/20231112150030.84609-1-ryncsn@gmail.com/
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.8

16 Apr 2025, 15:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-04-16 15:15

Updated : 2025-04-25 18:43

NVD link : CVE-2025-22035

Mitre link : CVE-2025-22035

CVE.ORG link : CVE-2025-22035

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-416

Use After Free

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This issue can be reproduced if puting a\n'mdelay(10)' after 'mutex_unlock(&trace_types_lock)' in s_start(),\nand executing the following script:\n\n $ echo function_graph > current_tracer\n $ cat trace > /dev/null &\n $ sleep 5 # Ensure the 'cat' reaches the 'mdelay(10)' point\n $ echo timerlat > current_tracer\n\nThe root cause lies in the two calls to print_graph_function_flags\nwithin print_trace_line during each s_show():\n\n * One through 'iter->trace->print_line()';\n * Another through 'event->funcs->trace()', which is hidden in\n print_trace_fmt() before print_trace_line returns.\n\nTracer switching only updates the former, while the latter continues\nto use the print_line function of the old tracer, which in the script\nabove is print_graph_function_flags.\n\nMoreover, when switching from the 'function_graph' tracer to the\n'timerlat' tracer, s_start only calls graph_trace_close of the\n'function_graph' tracer to free 'iter->private', but does not set\nit to NULL. This provides an opportunity for 'event->funcs->trace()'\nto use an invalid 'iter->private'.\n\nTo fix this issue, set 'iter->private' to NULL immediately after\nfreeing it in graph_trace_close(), ensuring that an invalid pointer\nis not passed to other tracers. Additionally, clean up the unnecessary\n'iter->private = NULL' during each 'cat trace' when using wakeup and\nirqsoff tracers.\n\n [1] https://lore.kernel.org/all/20231112150030.84609-1-ryncsn@gmail.com/"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tracing: Fix use-after-free en print_graph_function_flags durante el cambio de tracer Kairui inform\u00f3 de un problema de UAF en print_graph_function_flags() durante las pruebas de estr\u00e9s de ftrace [1]. Este problema se puede reproducir si se pone un 'mdelay(10)' despu\u00e9s de 'mutex_unlock(&trace_types_lock)' en s_start() y se ejecuta el siguiente script: $ echo function_graph > current_tracer $ cat trace > /dev/null & $ sleep 5 # Asegurarse de que 'cat' alcance el punto 'mdelay(10)' $ echo timerlat > current_tracer La causa ra\u00edz se encuentra en las dos llamadas a print_graph_function_flags dentro de print_trace_line durante cada s_show(): * Una a trav\u00e9s de 'iter->trace->print_line()'; * Otra funci\u00f3n mediante 'event->funcs->trace()', que est\u00e1 oculta en print_trace_fmt() antes del retorno de print_trace_line. Al cambiar de trazador, solo se actualiza el primero, mientras que el segundo contin\u00faa usando la funci\u00f3n print_line del trazador anterior, que en el script anterior es print_graph_function_flags. Adem\u00e1s, al cambiar del trazador 'function_graph' al trazador 'timerlat', s_start solo llama a graph_trace_close del trazador 'function_graph' para liberar 'iter->private', pero no lo establece en NULL. Esto permite que 'event->funcs->trace()' use un 'iter->private' no v\u00e1lido. Para solucionar este problema, establezca 'iter->private' en NULL inmediatamente despu\u00e9s de liberarlo en graph_trace_close(), lo que garantiza que no se pase un puntero no v\u00e1lido a otros trazadores. Adem\u00e1s, limpie el 'iter->private = NULL' innecesario durante cada 'cat trace' al usar los trazadores wakeup e irqsoff. [1] https://lore.kernel.org/all/20231112150030.84609-1-ryncsn@gmail.com/"}], "lastModified": "2025-04-25T18:43:50.147", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "71EE7896-7ADF-4518-840E-AFA5008A220C", "versionEndExcluding": "4.15", "versionStartIncluding": "4.14.324"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D51950EF-B814-4998-A0B2-65B014DDF4B1", "versionEndExcluding": "4.20", "versionStartIncluding": "4.19.293"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6E1C0F63-4CF8-4DBE-8382-68AAF5BA2EEF", "versionEndExcluding": "5.4.292", "versionStartIncluding": "5.4.255"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C6A39FE1-2EDE-4A5B-A6B8-1FF7FB12FCD7", "versionEndExcluding": "5.10.236", "versionStartIncluding": "5.10.193"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "954DCB85-1A70-4D6F-803D-F08554B92053", "versionEndExcluding": "5.15.180", "versionStartIncluding": "5.15.129"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "64F3AB12-D09C-4CC0-A1D0-80C64AE2F11C", "versionEndExcluding": "6.1.134", "versionStartIncluding": "6.1.50"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "043416BF-CC26-44F1-88BF-D9468ABD1929", "versionEndExcluding": "6.6.87", "versionStartIncluding": "6.4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "26CAB76D-F00F-43CE-BEAD-7097F8FB1D6C", "versionEndExcluding": "6.12.23", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E7E864B0-8C00-4679-BA55-659B4C9C3AD3", "versionEndExcluding": "6.13.11", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FADAE5D8-4808-442C-B218-77B2CE8780A0", "versionEndExcluding": "6.14.2", "versionStartIncluding": "6.14"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}

7.8 /10