CVE-2026-23310 (GCVE-0-2026-23310)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-05-11 22:04
VLAI
Title
bpf/bonding: reject vlan+srcmac xmit_hash_policy change when XDP is loaded
Summary
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
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 39a0876d595bd7c7512782dfcce0ee66f65bf221 , < 5c262bd0e39320a6d6c8277cb8349ce21c01b8c1 (git)
Affected: 39a0876d595bd7c7512782dfcce0ee66f65bf221 , < d36ad7e126c6a0c5f699583309ccc37e3a3263ea (git)
Affected: 39a0876d595bd7c7512782dfcce0ee66f65bf221 , < 0ace8027e41f6f094ef6c1aca42d2ed6cd7af54e (git)
Affected: 39a0876d595bd7c7512782dfcce0ee66f65bf221 , < e85fa809e507b9d8eff4840888b8c727e4e8448c (git)
Affected: 39a0876d595bd7c7512782dfcce0ee66f65bf221 , < 479d589b40b836442bbdadc3fdb37f001bb67f26 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.77 , ≤ 6.12.* (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "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-\u003exdp_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."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:04:24.623Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "bpf/bonding: reject vlan+srcmac xmit_hash_policy change when XDP is loaded",
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    "datePublished": "2026-03-25T10:27:05.943Z",
    "dateReserved": "2026-01-13T15:37:45.994Z",
    "dateUpdated": "2026-05-11T22:04:24.623Z",
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    "epss": {
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      "date": "2026-05-28",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23310\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-25T11:16:27.160\",\"lastModified\":\"2026-05-28T14:20:22.840\",\"vulnStatus\":\"Analyzed\",\"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-\u003exdp_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 pol\u00edtica de hash de transmisi\u00f3n (xmit_hash_policy) a vlan+srcmac cuando XDP est\u00e1 cargado\\n\\nbond_option_mode_set() ya rechaza los cambios de modo que har\u00edan incompatible un programa XDP cargado a trav\u00e9s de bond_xdp_check(). Sin embargo, bond_option_xmit_hash_policy_set() no tiene tal protecci\u00f3n.\\n\\nPara los modos 802.3ad y balance-xor, bond_xdp_check() devuelve falso cuando la pol\u00edtica de hash de transmisi\u00f3n (xmit_hash_policy) es vlan+srcmac, porque la carga \u00fatil 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 pol\u00edtica de hash de transmisi\u00f3n (xmit_hash_policy) compatible (por ejemplo, capa2+3).\\n2. Cambiar la pol\u00edtica de hash de transmisi\u00f3n (xmit_hash_policy) a vlan+srcmac mientras XDP permanece cargado.\\n\\nEsto deja bond-\u0026gt;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 protecci\u00f3n 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 pol\u00edtica de hash de transmisi\u00f3n (xmit_hash_policy) a vlan+srcmac cuando un programa XDP est\u00e1 cargado en un bond en modo 802.3ad o balance-xor.\\n\\nEl commit 39a0876d595b (\u0027net, bonding: No permitir vlan+srcmac con XDP\u0027) introdujo bond_xdp_check() que devuelve falso para los modos 802.3ad/balance-xor cuando la pol\u00edtica de hash de transmisi\u00f3n (xmit_hash_policy) es vlan+srcmac. La verificaci\u00f3n se integr\u00f3 en bond_xdp_set() para rechazar la asociaci\u00f3n de XDP con una pol\u00edtica incompatible, pero la ruta sim\u00e9trica -- impidiendo que la pol\u00edtica de hash de transmisi\u00f3n (xmit_hash_policy) se cambie a un valor incompatible despu\u00e9s de que XDP ya est\u00e9 cargado -- se dej\u00f3 sin protecci\u00f3n en bond_option_xmit_hash_policy_set().\\n\\nNota:\\nEl commit 094ee6017ea0 (\u0027bonding: verificar programa xdp al establecer modo de bond\u0027) a\u00f1adi\u00f3 posteriormente una protecci\u00f3n similar a bond_option_mode_set(), pero bond_option_xmit_hash_policy_set() permaneci\u00f3 sin protecci\u00f3n.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15\",\"versionEndExcluding\":\"6.6.130\",\"matchCriteriaId\":\"E265D934-61CB-43A3-82C6-6D0F5B6DD9D1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.77\",\"matchCriteriaId\":\"B3D12E00-E42D-4056-B354-BAD4903C03A5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.17\",\"matchCriteriaId\":\"A5E006E4-59C7-43C1-9231-62A72219F2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.7\",\"matchCriteriaId\":\"69245D10-0B71-485E-80C3-A64F077004D3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"F253B622-8837-4245-BCE5-A7BF8FC76A16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0ace8027e41f6f094ef6c1aca42d2ed6cd7af54e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/479d589b40b836442bbdadc3fdb37f001bb67f26\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5c262bd0e39320a6d6c8277cb8349ce21c01b8c1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d36ad7e126c6a0c5f699583309ccc37e3a3263ea\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e85fa809e507b9d8eff4840888b8c727e4e8448c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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