CVE-2026-22993

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-22993
In the Linux kernel, the following vulnerability has been resolved: idpf: Fix RSS LUT NULL ptr issue after soft reset During soft reset, the RSS LUT is freed and not restored unless the interface is up. If an ethtool command that accesses the rss lut is attempted immediately after reset, it will result in NULL ptr dereference. Also, there is no need to reset the rss lut if the soft reset does not involve queue count change. After soft reset, set the RSS LUT to default values based on the updated queue count only if the reset was a result of a queue count change and the LUT was not configured by the user. In all other cases, don't touch the LUT. Steps to reproduce: ** Bring the interface down (if up) ifconfig eth1 down ** update the queue count (eg., 27->20) ethtool -L eth1 combined 20 ** display the RSS LUT ethtool -x eth1 [82375.558338] BUG: kernel NULL pointer dereference, address: 0000000000000000 [82375.558373] #PF: supervisor read access in kernel mode [82375.558391] #PF: error_code(0x0000) - not-present page [82375.558408] PGD 0 P4D 0 [82375.558421] Oops: Oops: 0000 [#1] SMP NOPTI <snip> [82375.558516] RIP: 0010:idpf_get_rxfh+0x108/0x150 [idpf] [82375.558786] Call Trace: [82375.558793] <TASK> [82375.558804] rss_prepare.isra.0+0x187/0x2a0 [82375.558827] rss_prepare_data+0x3a/0x50 [82375.558845] ethnl_default_doit+0x13d/0x3e0 [82375.558863] genl_family_rcv_msg_doit+0x11f/0x180 [82375.558886] genl_rcv_msg+0x1ad/0x2b0 [82375.558902] ? __pfx_ethnl_default_doit+0x10/0x10 [82375.558920] ? __pfx_genl_rcv_msg+0x10/0x10 [82375.558937] netlink_rcv_skb+0x58/0x100 [82375.558957] genl_rcv+0x2c/0x50 [82375.558971] netlink_unicast+0x289/0x3e0 [82375.558988] netlink_sendmsg+0x215/0x440 [82375.559005] __sys_sendto+0x234/0x240 [82375.559555] __x64_sys_sendto+0x28/0x30 [82375.560068] x64_sys_call+0x1909/0x1da0 [82375.560576] do_syscall_64+0x7a/0xfa0 [82375.561076] ? clear_bhb_loop+0x60/0xb0 [82375.561567] entry_SYSCALL_64_after_hwframe+0x76/0x7e <snip>

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/a09380354d2f14759b9dd45de1bc2f6bf49e651b
https://git.kernel.org/stable/c/ab92fa4dd81beaaed4e93a851f7a37c9b2d9776f Patch
https://git.kernel.org/stable/c/ebecca5b093895da801b3eba1a55b4ec4027d196 Patch
Configurations

Configuration 1 (hide)

OR 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:*:*:*:*:*:*
History

02 Apr 2026, 12:16

Type Values Removed Values Added
References
  • () https://git.kernel.org/stable/c/a09380354d2f14759b9dd45de1bc2f6bf49e651b -
Summary
  • (es) En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: idpf: Soluciona el problema de puntero NULL de la RSS LUT después de un reinicio suave Durante el reinicio suave, la RSS LUT se libera y no se restaura a menos que la interfaz esté activa. Si se intenta un comando ethtool que accede a la rss lut inmediatamente después del reinicio, resultará en una desreferencia de puntero NULL. Además, no es necesario reiniciar la rss lut si el reinicio suave no implica un cambio en el recuento de colas. Después del reinicio suave, establece la RSS LUT a valores predeterminados basándose en el recuento de colas actualizado solo si el reinicio fue resultado de un cambio en el recuento de colas y la LUT no fue configurada por el usuario. En todos los demás casos, no modifiques la LUT. Pasos para reproducir: Desactiva la interfaz (si está activa) ifconfig eth1 down Actualiza el recuento de colas (ej., 27-&gt;20) ethtool -L eth1 combined 20 ** Muestra la RSS LUT ethtool -x eth1 [82375.558338] BUG: desreferencia de puntero NULL del kernel, dirección: 0000000000000000 [82375.558373] #PF: acceso de lectura de supervisor en modo kernel [82375.558391] #PF: error_code(0x0000) - página no presente [82375.558408] PGD 0 P4D 0 [82375.558421] Oops: Oops: 0000 [#1] SMP NOPTI [82375.558516] RIP: 0010:idpf_get_rxfh+0x108/0x150 [idpf] [82375.558786] Traza de llamada: [82375.558793] [82375.558804] rss_prepare.isra.0+0x187/0x2a0 [82375.558827] rss_prepare_data+0x3a/0x50 [82375.558845] ethnl_default_doit+0x13d/0x3e0 [82375.558863] genl_family_rcv_msg_doit+0x11f/0x180 [82375.558886] genl_rcv_msg+0x1ad/0x2b0 [82375.558902] ? __pfx_ethnl_default_doit+0x10/0x10 [82375.558920] ? __pfx_genl_rcv_msg+0x10/0x10 [82375.558937] netlink_rcv_skb+0x58/0x100 [82375.558957] genl_rcv+0x2c/0x50 [82375.558971] netlink_unicast+0x289/0x3e0 [82375.558988] netlink_sendmsg+0x215/0x440 [82375.559005] __sys_sendto+0x234/0x240 [82375.559555] __x64_sys_sendto+0x28/0x30 [82375.560068] x64_sys_call+0x1909/0x1da0 [82375.560576] do_syscall_64+0x7a/0xfa0 [82375.561076] ? clear_bhb_loop+0x60/0xb0 [82375.561567] entry_SYSCALL_64_after_hwframe+0x76/0x7e

26 Feb 2026, 17:19

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/ab92fa4dd81beaaed4e93a851f7a37c9b2d9776f - () https://git.kernel.org/stable/c/ab92fa4dd81beaaed4e93a851f7a37c9b2d9776f - Patch
References () https://git.kernel.org/stable/c/ebecca5b093895da801b3eba1a55b4ec4027d196 - () https://git.kernel.org/stable/c/ebecca5b093895da801b3eba1a55b4ec4027d196 - Patch
CWE CWE-476
CPE cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*
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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux
Linux linux Kernel

23 Jan 2026, 16:15

Type Values Removed Values Added
New CVE
Information

Published : 2026-01-23 16:15

Updated : 2026-04-02 12:16

NVD link : CVE-2026-22993

Mitre link : CVE-2026-22993

CVE.ORG link : CVE-2026-22993

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference