{ "cveId": "CVE-2026-23438", "url": "https://patchblox.com/security/cve/CVE-2026-23438", "summary": "CVE-2026-23438 is fixed in 51 products on 1 platform, first by DEBIAN-CVE-2026-23438, released April 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.", "title": "net: mvpp2: guard flow control update with global_tx_fc in buffer switching", "description": "In the Linux kernel, the following vulnerability has been resolved: net: mvpp2: guard flow control update with global_tx_fc in buffer switching mvpp2_bm_switch_buffers() unconditionally calls mvpp2_bm_pool_update_priv_fc() when switching between per-cpu and shared buffer pool modes. This function programs CM3 flow control registers via mvpp2_cm3_read()/mvpp2_cm3_write(), which dereference priv-\u003Ecm3_base without any NULL check. When the CM3 SRAM resource is not present in the device tree (the third reg entry added by commit 60523583b07c (\u0022dts: marvell: add CM3 SRAM memory to cp11x ethernet device tree\u0022)), priv-\u003Ecm3_base remains NULL and priv-\u003Eglobal_tx_fc is false. Any operation that triggers mvpp2_bm_switch_buffers(), for example an MTU change that crosses the jumbo frame threshold, will crash: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits pc : readl\u002B0x0/0x18 lr : mvpp2_cm3_read.isra.0\u002B0x14/0x20 Call trace: readl\u002B0x0/0x18 mvpp2_bm_pool_update_fc\u002B0x40/0x12c mvpp2_bm_pool_update_priv_fc\u002B0x94/0xd8 mvpp2_bm_switch_buffers.isra.0\u002B0x80/0x1c0 mvpp2_change_mtu\u002B0x140/0x380 __dev_set_mtu\u002B0x1c/0x38 dev_set_mtu_ext\u002B0x78/0x118 dev_set_mtu\u002B0x48/0xa8 dev_ifsioc\u002B0x21c/0x43c dev_ioctl\u002B0x2d8/0x42c sock_ioctl\u002B0x314/0x378 Every other flow control call site in the driver already guards hardware access with either priv-\u003Eglobal_tx_fc or port-\u003Etx_fc. mvpp2_bm_switch_buffers() is the only place that omits this check. Add the missing priv-\u003Eglobal_tx_fc guard to both the disable and re-enable calls in mvpp2_bm_switch_buffers(), consistent with the rest of the driver.", "published": "2026-04-03T16:16:25Z", "severity": "Moderate", "cvss": 5.5, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "epss": 0.00134, "epssPercentile": 0.02917, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23438", "fixes": [ { "platform": "linux", "product": "dtb-aarch64", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.35.1", "fix": "OPENSUSE-SU-2026:20965-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-20965-1", "released": "2026-06-15T13:44:30Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.35.1", "fix": "OPENSUSE-SU-2026:20965-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-20965-1", "released": "2026-06-15T13:44:30Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.60.1", "fix": "SUSE-SU-2026:2482-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2482-1", "released": "2026-06-22T11:10:39Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "sles 16.0", "fixedVersion": "6.12.0-160000.35.1", "fix": "SUSE-SU-2026:22127-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22127-1", "released": "2026-06-15T13:06:19Z" }, { "platform": "linux", "product": "kernel-azure", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.35.1", "fix": "OPENSUSE-SU-2026:20965-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-20965-1", "released": "2026-06-15T13:44:30Z" }, { "platform": "linux", "product": "kernel-azure", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.60.1", 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