CVE-2024-26783

mm/vmscan: fix a bug calling wakeup_kswapd() with a wrong zone index

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

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

mm/vmscan: fix a bug calling wakeup_kswapd() with a wrong zone index

With numa balancing on, when a numa system is running where a numa node
doesn't have its local memory so it has no managed zones, the following
oops has been observed. It's because wakeup_kswapd() is called with a
wrong zone index, -1. Fixed it by checking the index before calling
wakeup_kswapd().

> BUG: unable to handle page fault for address: 00000000000033f3
> #PF: supervisor read access in kernel mode
> #PF: error_code(0x0000) - not-present page
> PGD 0 P4D 0
> Oops: 0000 [#1] PREEMPT SMP NOPTI
> CPU: 2 PID: 895 Comm: masim Not tainted 6.6.0-dirty #255
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
> RIP: 0010:wakeup_kswapd (./linux/mm/vmscan.c:7812)
> Code: (omitted)
> RSP: 0000:ffffc90004257d58 EFLAGS: 00010286
> RAX: ffffffffffffffff RBX: ffff88883fff0480 RCX: 0000000000000003
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88883fff0480
> RBP: ffffffffffffffff R08: ff0003ffffffffff R09: ffffffffffffffff
> R10: ffff888106c95540 R11: 0000000055555554 R12: 0000000000000003
> R13: 0000000000000000 R14: 0000000000000000 R15: ffff88883fff0940
> FS: 00007fc4b8124740(0000) GS:ffff888827c00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00000000000033f3 CR3: 000000026cc08004 CR4: 0000000000770ee0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> PKRU: 55555554
> Call Trace:
> <TASK>
> ? __die
> ? page_fault_oops
> ? __pte_offset_map_lock
> ? exc_page_fault
> ? asm_exc_page_fault
> ? wakeup_kswapd
> migrate_misplaced_page
> __handle_mm_fault
> handle_mm_fault
> do_user_addr_fault
> exc_page_fault
> asm_exc_page_fault
> RIP: 0033:0x55b897ba0808
> Code: (omitted)
> RSP: 002b:00007ffeefa821a0 EFLAGS: 00010287
> RAX: 000055b89983acd0 RBX: 00007ffeefa823f8 RCX: 000055b89983acd0
> RDX: 00007fc2f8122010 RSI: 0000000000020000 RDI: 000055b89983acd0
> RBP: 00007ffeefa821a0 R08: 0000000000000037 R09: 0000000000000075
> R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
> R13: 00007ffeefa82410 R14: 000055b897ba5dd8 R15: 00007fc4b8340000
> </TASK>

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: mm/vmscan: corrige un error al llamar a wakeup_kswapd() con un índice de zona incorrecto Con el equilibrio numa activado, cuando se ejecuta un SYSTEM numa donde un nodo numa no tiene su memoria local por lo que no tiene zonas administradas, se ha observado lo siguiente. Es porque se llama a wakeup_kswapd() con un índice de zona incorrecto, -1. Se solucionó verificando el índice antes de llamar a wakeup_kswapd(). > ERROR: no se puede manejar el error de página para la dirección: 00000000000033f3 > #PF: acceso de lectura del supervisor en modo kernel > #PF: error_code(0x0000) - página no presente > PGD 0 P4D 0 > Ups: 0000 [#1] SMP PREEMPT NOPTI > CPU: 2 PID: 895 Comm: masim Not tainted 6.6.0-dirty #255 > Nombre del hardware: PC estándar QEMU (i440FX + PIIX, 1996), BIOS > rel-1.16.0-0-gd239552ce722-prebuilt.qemu .org 01/04/2014 > RIP: 0010:wakeup_kswapd (./linux/mm/vmscan.c:7812) > Código: (omitido) > RSP: 0000:ffffc90004257d58 EFLAGS: 00010286 > RAX: ffffffffffffffff RBX: ffff88883f ff0480RCX: 0000000000000003 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88883fff0480 > RBP: ffffffffffffffff R08: ff0003ffffffffff R09: ffffffffffffffff > R10: ff ff888106c95540 R11: 0000000055555554 R12: 0000000000000003 > R13: 0000000000000000 R14: 00000000000000000 R15: ffff88883fff0940 > FS: 0000 7fc4b8124740(0000) GS: ffff888827c00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000000033f3 CR3: 000000026cc08004 CR4: 0000000000770ee0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 00000000000000000 DR6: 00000000ffe0ff0 DR7: 000 0000000000400 > PKRU: 55555554 > Rastreo de llamadas: > > ? __morir > ? page_fault_oops > ? __pte_offset_map_lock > ? exc_page_fault > ? asm_exc_page_fault > ? wakeup_kswapd > migrar_misplaced_page > __handle_mm_fault > handle_mm_fault > do_user_addr_fault > exc_page_fault > asm_exc_page_fault > RIP: 0033:0x55b897ba0808 > Código: (omitido) > RSP: 002b:00007ffeefa821a0 EFLAGS: 00 010287 > RAX: 000055b89983acd0 RBX: 00007ffeefa823f8 RCX: 000055b89983acd0 > RDX: 00007fc2f8122010 RSI: 0000000000020000 RDI: 000055b89983acd0 > RBP: 00007ffeefa821a0 R08: 0000000000000037 R09: 00000000000000075 > R10: 0000000000000000 R11: 0 000000000000202 R12: 0000000000000000 > R13: 00007ffeefa82410 R14: 000055b897ba5dd8 R15: 00007fc4b8340000 >

A vulnerability was found in the Linux kernel's memory management subsystem. The `wakeup_kswapd()` function was called with an incorrect zone index. This error could disrupt the proper functioning of memory management, potentially leading to system instability or performance issues.

*Credits: N/A

CVSS Scores

Red Hatv3.1 5.5

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-02-19 CVE Reserved
2024-04-04 CVE Published
2024-04-05 EPSS Updated
2024-08-02 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-762: Mismatched Memory Management Routines

CAPEC

References (6)

URL	Tag	Source
https://git.kernel.org/stable/c/c574bbe917036c8968b984c82c7b13194fe5ce98	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/d6159bd4c00594249e305bfe02304c67c506264e	2024-03-15
https://git.kernel.org/stable/c/bdd21eed8b72f9e28d6c279f6db258e090c79080	2024-03-06
https://git.kernel.org/stable/c/2774f256e7c0219e2b0a0894af1c76bdabc4f974	2024-02-24

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2024-26783	2024-07-17
https://bugzilla.redhat.com/show_bug.cgi?id=2273466	2024-07-17

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.18 < 6.6.22 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.18 < 6.6.22"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.18 < 6.7.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.18 < 6.7.9"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.18 < 6.8 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.18 < 6.8"		en		Affected