CVE-2026-23310
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: bpf/bonding: reject vlan+srcmac xmit_hash_policy change when XDP is loaded bond_option_mode_set() already rejects mode changes that would make a loaded XDP program incompatible via bond_xdp_check(). However, bond_option_xmit_hash_policy_set() has no such guard. For 802.3ad and balance-xor modes, bond_xdp_check() returns false when xmit_hash_policy is vlan+srcmac, because the 802.1q payload is usually absent due to hardware offload. This means a user can: 1. Attach a native XDP program to a bond in 802.3ad/balance-xor mode with a compatible xmit_hash_policy (e.g. layer2+3). 2. Change xmit_hash_policy to vlan+srcmac while XDP remains loaded. This leaves bond->xdp_prog set but bond_xdp_check() now returning false for the same device. When the bond is later destroyed, dev_xdp_uninstall() calls bond_xdp_set(dev, NULL, NULL) to remove the program, which hits the bond_xdp_check() guard and returns -EOPNOTSUPP, triggering: WARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL)) Fix this by rejecting xmit_hash_policy changes to vlan+srcmac when an XDP program is loaded on a bond in 802.3ad or balance-xor mode. commit 39a0876d595b ("net, bonding: Disallow vlan+srcmac with XDP") introduced bond_xdp_check() which returns false for 802.3ad/balance-xor modes when xmit_hash_policy is vlan+srcmac. The check was wired into bond_xdp_set() to reject XDP attachment with an incompatible policy, but the symmetric path -- preventing xmit_hash_policy from being changed to an incompatible value after XDP is already loaded -- was left unguarded in bond_option_xmit_hash_policy_set(). Note: commit 094ee6017ea0 ("bonding: check xdp prog when set bond mode") later added a similar guard to bond_option_mode_set(), but bond_option_xmit_hash_policy_set() remained unprotected.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-03-25 11:16:27.160000
Last modified
2026-11-05 22:18:13.983000
View original CVE JSON
{
"id": "CVE-2026-23310",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-03-25T11:16:27.160",
"lastModified": "2026-11-05T22:18:13.983",
"vulnStatus": "Modified",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf/bonding: reject vlan+srcmac xmit_hash_policy change when XDP is loaded\n\nbond_option_mode_set() already rejects mode changes that would make a\nloaded XDP program incompatible via bond_xdp_check(). However,\nbond_option_xmit_hash_policy_set() has no such guard.\n\nFor 802.3ad and balance-xor modes, bond_xdp_check() returns false when\nxmit_hash_policy is vlan+srcmac, because the 802.1q payload is usually\nabsent due to hardware offload. This means a user can:\n\n1. Attach a native XDP program to a bond in 802.3ad/balance-xor mode\n with a compatible xmit_hash_policy (e.g. layer2+3).\n2. Change xmit_hash_policy to vlan+srcmac while XDP remains loaded.\n\nThis leaves bond->xdp_prog set but bond_xdp_check() now returning false\nfor the same device. When the bond is later destroyed, dev_xdp_uninstall()\ncalls bond_xdp_set(dev, NULL, NULL) to remove the program, which hits\nthe bond_xdp_check() guard and returns -EOPNOTSUPP, triggering:\n\nWARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL))\n\nFix this by rejecting xmit_hash_policy changes to vlan+srcmac when an\nXDP program is loaded on a bond in 802.3ad or balance-xor mode.\n\ncommit 39a0876d595b (\"net, bonding: Disallow vlan+srcmac with XDP\")\nintroduced bond_xdp_check() which returns false for 802.3ad/balance-xor\nmodes when xmit_hash_policy is vlan+srcmac. The check was wired into\nbond_xdp_set() to reject XDP attachment with an incompatible policy, but\nthe symmetric path -- preventing xmit_hash_policy from being changed to an\nincompatible value after XDP is already loaded -- was left unguarded in\nbond_option_xmit_hash_policy_set().\n\nNote:\ncommit 094ee6017ea0 (\"bonding: check xdp prog when set bond mode\")\nlater added a similar guard to bond_option_mode_set(), but\nbond_option_xmit_hash_policy_set() remained unprotected."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbpf/bonding: rechazar el cambio de política de hash de transmisión (xmit_hash_policy) a vlan+srcmac cuando XDP está cargado\n\nbond_option_mode_set() ya rechaza los cambios de modo que harían incompatible un programa XDP cargado a través de bond_xdp_check(). Sin embargo, bond_option_xmit_hash_policy_set() no tiene tal protección.\n\nPara los modos 802.3ad y balance-xor, bond_xdp_check() devuelve falso cuando la política de hash de transmisión (xmit_hash_policy) es vlan+srcmac, porque la carga útil 802.1q suele estar ausente debido a la descarga de hardware. Esto significa que un usuario puede:\n\n1. Adjuntar un programa XDP nativo a un bond en modo 802.3ad/balance-xor con una política de hash de transmisión (xmit_hash_policy) compatible (por ejemplo, capa2+3).\n2. Cambiar la política de hash de transmisión (xmit_hash_policy) a vlan+srcmac mientras XDP permanece cargado.\n\nEsto deja bond->xdp_prog establecido, pero bond_xdp_check() ahora devuelve falso para el mismo dispositivo. Cuando el bond es destruido posteriormente, dev_xdp_uninstall() llama a bond_xdp_set(dev, NULL, NULL) para eliminar el programa, lo que activa la protección de bond_xdp_check() y devuelve -EOPNOTSUPP, desencadenando:\n\nWARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL))\n\nSolucione esto rechazando los cambios de política de hash de transmisión (xmit_hash_policy) a vlan+srcmac cuando un programa XDP está cargado en un bond en modo 802.3ad o balance-xor.\n\nEl commit 39a0876d595b ('net, bonding: No permitir vlan+srcmac con XDP') introdujo bond_xdp_check() que devuelve falso para los modos 802.3ad/balance-xor cuando la política de hash de transmisión (xmit_hash_policy) es vlan+srcmac. La verificación se integró en bond_xdp_set() para rechazar la asociación de XDP con una política incompatible, pero la ruta simétrica -- impidiendo que la política de hash de transmisión (xmit_hash_policy) se cambie a un valor incompatible después de que XDP ya esté cargado -- se dejó sin protección en bond_option_xmit_hash_policy_set().\n\nNota:\nEl commit 094ee6017ea0 ('bonding: verificar programa xdp al establecer modo de bond') añadió posteriormente una protección similar a bond_option_mode_set(), pero bond_option_xmit_hash_policy_set() permaneció sin protección."
}
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"source": "[email protected]",
"type": "Primary",
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"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
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"integrityImpact": "NONE",
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},
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