CVE-2026-23438

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23438", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:46.017Z", "datePublished": "2026-04-03T15:15:22.701Z", "dateUpdated": "2026-11-10T12:43:12.156Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:06:54.590Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mvpp2: guard flow control update with global_tx_fc in buffer switching\n\nmvpp2_bm_switch_buffers() unconditionally calls\nmvpp2_bm_pool_update_priv_fc() when switching between per-cpu and\nshared buffer pool modes. This function programs CM3 flow control\nregisters via mvpp2_cm3_read()/mvpp2_cm3_write(), which dereference\npriv->cm3_base without any NULL check.\n\nWhen the CM3 SRAM resource is not present in the device tree (the\nthird reg entry added by commit 60523583b07c (\"dts: marvell: add CM3\nSRAM memory to cp11x ethernet device tree\")), priv->cm3_base remains\nNULL and priv->global_tx_fc is false. Any operation that triggers\nmvpp2_bm_switch_buffers(), for example an MTU change that crosses\nthe jumbo frame threshold, will crash:\n\n Unable to handle kernel NULL pointer dereference at\n virtual address 0000000000000000\n Mem abort info:\n ESR = 0x0000000096000006\n EC = 0x25: DABT (current EL), IL = 32 bits\n pc : readl+0x0/0x18\n lr : mvpp2_cm3_read.isra.0+0x14/0x20\n Call trace:\n readl+0x0/0x18\n mvpp2_bm_pool_update_fc+0x40/0x12c\n mvpp2_bm_pool_update_priv_fc+0x94/0xd8\n mvpp2_bm_switch_buffers.isra.0+0x80/0x1c0\n mvpp2_change_mtu+0x140/0x380\n __dev_set_mtu+0x1c/0x38\n dev_set_mtu_ext+0x78/0x118\n dev_set_mtu+0x48/0xa8\n dev_ifsioc+0x21c/0x43c\n dev_ioctl+0x2d8/0x42c\n sock_ioctl+0x314/0x378\n\nEvery other flow control call site in the driver already guards\nhardware access with either priv->global_tx_fc or port->tx_fc.\nmvpp2_bm_switch_buffers() is the only place that omits this check.\n\nAdd the missing priv->global_tx_fc guard to both the disable and\nre-enable calls in mvpp2_bm_switch_buffers(), consistent with the\nrest of the driver."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c"], "versions": [{"version": "3a616b92a9d17448d96a33bf58e69f01457fd43a", "lessThan": "0cfcd31f98fc608dc9406bff3fee3a9dd364d014", "status": "affected", "versionType": "git"}, {"version": "3a616b92a9d17448d96a33bf58e69f01457fd43a", "lessThan": "da089f74a993f846685067b14158cb41b879ff29", "status": "affected", "versionType": "git"}, {"version": "3a616b92a9d17448d96a33bf58e69f01457fd43a", "lessThan": "ff0c54f088f7ab91dbbf47cf8244460f99122750", "status": "affected", "versionType": "git"}, {"version": "3a616b92a9d17448d96a33bf58e69f01457fd43a", "lessThan": "7bd20f4b3ef3044dc55acd5b8ef748a70d29d03f", "status": "affected", "versionType": "git"}, {"version": "3a616b92a9d17448d96a33bf58e69f01457fd43a", "lessThan": "7df2b50cae1a76cbb90b294f3edb61e3e10bf2e9", "status": "affected", "versionType": "git"}, {"version": "3a616b92a9d17448d96a33bf58e69f01457fd43a", "lessThan": "8baced53a35fc9710f80d6ca016a2c418dc3231f", "status": "affected", "versionType": "git"}, {"version": "3a616b92a9d17448d96a33bf58e69f01457fd43a", "lessThan": "8a63baadf08453f66eb582fdb6dd234f72024723", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c"], "versions": [{"version": "5.12", "status": "affected"}, {"version": "0", "lessThan": "5.12", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.20", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.10", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.1.167"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.6.130"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.12.78"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.18.20"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.19.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0cfcd31f98fc608dc9406bff3fee3a9dd364d014"}, {"url": "https://git.kernel.org/stable/c/da089f74a993f846685067b14158cb41b879ff29"}, {"url": "https://git.kernel.org/stable/c/ff0c54f088f7ab91dbbf47cf8244460f99122750"}, {"url": "https://git.kernel.org/stable/c/7bd20f4b3ef3044dc55acd5b8ef748a70d29d03f"}, {"url": "https://git.kernel.org/stable/c/7df2b50cae1a76cbb90b294f3edb61e3e10bf2e9"}, {"url": "https://git.kernel.org/stable/c/8baced53a35fc9710f80d6ca016a2c418dc3231f"}, {"url": "https://git.kernel.org/stable/c/8a63baadf08453f66eb582fdb6dd234f72024723"}], "title": "net: mvpp2: guard flow control update with global_tx_fc in buffer switching", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-11-10T12:43:12.156Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "versions": [{"status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "versions": [{"status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom"}], 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"https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}, {"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}]}]}}

{}

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"version": "6.6.130", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.78", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.20", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"affectedData": [{"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, 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"vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.6", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.5", "versionType": "custom"}]}, {"defaultStatus": "unknown", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "V3.1.7", "versionType": "custom"}]}], "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "AA3D6441-4F2E-41AB-A26D-388B03A5932F", "versionEndExcluding": "5.15.203", "versionStartIncluding": "5.12.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "2EDC6BAF-B710-4E26-B6AA-D68922EE7B43", "versionEndExcluding": "6.1.167", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C57BB918-DF28-46B3-94F7-144176841267", "versionEndExcluding": "6.6.130", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "28D591F5-B196-4CC9-905C-DC80F116E7A8", "versionEndExcluding": "6.12.78", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E5571059-6552-48E7-9BEF-3E358C387171", 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"vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mvpp2: guard flow control update with global_tx_fc in buffer switching\n\nmvpp2_bm_switch_buffers() unconditionally calls\nmvpp2_bm_pool_update_priv_fc() when switching between per-cpu and\nshared buffer pool modes. This function programs CM3 flow control\nregisters via mvpp2_cm3_read()/mvpp2_cm3_write(), which dereference\npriv->cm3_base without any NULL check.\n\nWhen the CM3 SRAM resource is not present in the device tree (the\nthird reg entry added by commit 60523583b07c (\"dts: marvell: add CM3\nSRAM memory to cp11x ethernet device tree\")), priv->cm3_base remains\nNULL and priv->global_tx_fc is false. Any operation that triggers\nmvpp2_bm_switch_buffers(), for example an MTU change that crosses\nthe jumbo frame threshold, will crash:\n\n Unable to handle kernel NULL pointer dereference at\n virtual address 0000000000000000\n Mem abort info:\n ESR = 0x0000000096000006\n EC = 0x25: DABT (current EL), IL = 32 bits\n pc : readl+0x0/0x18\n lr : mvpp2_cm3_read.isra.0+0x14/0x20\n Call trace:\n readl+0x0/0x18\n mvpp2_bm_pool_update_fc+0x40/0x12c\n mvpp2_bm_pool_update_priv_fc+0x94/0xd8\n mvpp2_bm_switch_buffers.isra.0+0x80/0x1c0\n mvpp2_change_mtu+0x140/0x380\n __dev_set_mtu+0x1c/0x38\n dev_set_mtu_ext+0x78/0x118\n dev_set_mtu+0x48/0xa8\n dev_ifsioc+0x21c/0x43c\n dev_ioctl+0x2d8/0x42c\n sock_ioctl+0x314/0x378\n\nEvery other flow control call site in the driver already guards\nhardware access with either priv->global_tx_fc or port->tx_fc.\nmvpp2_bm_switch_buffers() is the only place that omits this check.\n\nAdd the missing priv->global_tx_fc guard to both the disable and\nre-enable calls in mvpp2_bm_switch_buffers(), consistent with the\nrest of the driver."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: mvpp2: proteger la actualizaci\u00f3n del control de flujo con global_tx_fc en la conmutaci\u00f3n de b\u00faferes\n\nmvpp2_bm_switch_buffers() llama incondicionalmente a mvpp2_bm_pool_update_priv_fc() al cambiar entre modos de pool de b\u00faferes por CPU y compartidos. Esta funci\u00f3n programa registros de control de flujo CM3 a trav\u00e9s de mvpp2_cm3_read()/mvpp2_cm3_write(), que desreferencian priv -> cm3_base sin ninguna comprobaci\u00f3n de NULL.\n\nCuando el recurso CM3 SRAM no est\u00e1 presente en el \u00e1rbol de dispositivos (la tercera entrada reg a\u00f1adida por el commit 60523583b07c ('dts: marvell: add CM3 SRAM memory to cp11x ethernet device tree')), priv -> cm3_base permanece NULL y priv -> global_tx_fc es falso. Cualquier operaci\u00f3n que active mvpp2_bm_switch_buffers(), por ejemplo, un cambio de MTU que cruza el umbral de trama jumbo, provocar\u00e1 un fallo:\n\n No se puede manejar la desreferencia de puntero NULL del kernel en\n direcci\u00f3n virtual 0000000000000000\n Informaci\u00f3n de aborto de memoria:\n ESR = 0x0000000096000006\n EC = 0x25: DABT (current EL), IL = 32 bits\n pc : readl+0x0/0x18\n lr : mvpp2_cm3_read.isra.0+0x14/0x20\n Rastreo de llamadas:\n readl+0x0/0x18\n mvpp2_bm_pool_update_fc+0x40/0x12c\n mvpp2_bm_pool_update_priv_fc+0x94/0xd8\n mvpp2_bm_switch_buffers.isra.0+0x80/0x1c0\n mvpp2_change_mtu+0x140/0x380\n __dev_set_mtu+0x1c/0x38\n dev_set_mtu_ext+0x78/0x118\n dev_set_mtu+0x48/0xa8\n dev_ifsioc+0x21c/0x43c\n dev_ioctl+0x2d8/0x42c\n sock_ioctl+0x314/0x378\n\nCada otro sitio de llamada de control de flujo en el controlador ya protege el acceso al hardware con priv -> global_tx_fc o port -> tx_fc. mvpp2_bm_switch_buffers() es el \u00fanico lugar que omite esta comprobaci\u00f3n.\n\nA\u00f1adir la protecci\u00f3n priv -> global_tx_fc faltante tanto a las llamadas de deshabilitaci\u00f3n como de re-habilitaci\u00f3n en mvpp2_bm_switch_buffers(), de forma consistente con el resto del controlador."}], "id": "CVE-2026-23438", "lastModified": "2026-11-10T13:18:45.880", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-04-03T16:16:25.540", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0cfcd31f98fc608dc9406bff3fee3a9dd364d014"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7bd20f4b3ef3044dc55acd5b8ef748a70d29d03f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7df2b50cae1a76cbb90b294f3edb61e3e10bf2e9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8a63baadf08453f66eb582fdb6dd234f72024723"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8baced53a35fc9710f80d6ca016a2c418dc3231f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/da089f74a993f846685067b14158cb41b879ff29"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ff0c54f088f7ab91dbbf47cf8244460f99122750"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: mvpp2: guard flow control update with global_tx_fc in buffer switching", "id": "2454812", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454812"}, "csaw": false, "cwe": "CWE-476", "details": ["A flaw was found in the Linux kernel's mvpp2 driver. A local privileged user could cause a system crash, leading to a Denial of Service (DoS), by triggering a null pointer dereference. This occurs when changing the Maximum Transmission Unit (MTU) on systems where the CM3 SRAM resource is not present, due to improper handling of hardware access in the `mvpp2_bm_switch_buffers()` function."], "name": "CVE-2026-23438", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23438\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23438\nhttps://lore.kernel.org/linux-cve-announce/2026040313-CVE-2026-23438-5faa@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3a616b92a9d17448d96a33bf58e69f01457fd43a,da089f74a993f846685067b14158cb41b879ff29)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3a616b92a9d17448d96a33bf58e69f01457fd43a,ff0c54f088f7ab91dbbf47cf8244460f99122750)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3a616b92a9d17448d96a33bf58e69f01457fd43a,7bd20f4b3ef3044dc55acd5b8ef748a70d29d03f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3a616b92a9d17448d96a33bf58e69f01457fd43a,7df2b50cae1a76cbb90b294f3edb61e3e10bf2e9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3a616b92a9d17448d96a33bf58e69f01457fd43a,8baced53a35fc9710f80d6ca016a2c418dc3231f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3a616b92a9d17448d96a33bf58e69f01457fd43a,8a63baadf08453f66eb582fdb6dd234f72024723)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.167,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.130,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.78,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.20,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.10,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "analysis": {"en": {"generated_at": "2026-04-28T21:47:59.794878+00:00", "value": {"mitigation_remediation": ["Apply a kernel update that includes the MVPP2 driver patch adding the CM3 SRAM device tree entry and the global_tx_fc guard.", "If a kernel update is not immediately available, modify the device tree for the affected hardware to include the CM3 SRAM memory resource so that priv->cm3_base is non\u2011NULL.", "Avoid performing MTU changes that cross the jumbo frame threshold on systems with the unpatched driver until a fix is deployed.", "Consider disabling MTU changes for processes that require elevated privileges or restricting MTU modification to a trusted maintenance window as a temporary containment measure."], "summary": {"action": "Immediate Patch", "impact": "Kernel panic (Denial of Service)"}, "threat_synthesis": {"affected_systems": "Linux kernels that include the MVPP2 driver, such as kernel 5.12 and the 7.0 release candidates prior to the inclusion of the patch that adds the CM3 SRAM device tree entry and the global_tx_fc guard. Systems running Marvell Ethernet devices that rely on the MVPP2 packet processor are the most likely to be affected.", "description_and_impact": "A null\u2011pointer dereference in the Linux MVPP2 network driver occurs when the driver attempts to switch buffer pools during operations such as changing the MTU beyond the jumbo frame limit, because the code does not check that the CM3 SRAM base pointer is valid. This missing guard allows the driver to read from address zero, which triggers a kernel panic and brings the system down, disabling all kernel services and causing a denial of service.", "risk_and_exploitability": "The flaw is locally exploitable by an attacker with sufficient privileges to trigger a buffer\u2011switching event\u2014such as changing the MTU. It does not provide a remote code execution path. The CVSS score of 5.5 reflects moderate severity, the EPSS score of <1% indicates a low likelihood of real-world exploitation, and the vulnerability is not listed in CISA's KEV catalog. Nonetheless, any local attacker who can influence network configuration can crash the system, rendering services unavailable."}}}}, "created": "2026-04-03T21:14:00.106620+00:00", "updated": "2026-04-28T22:00:14.102878+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}