{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49844", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-05-01T14:05:17.229Z", "datePublished": "2025-05-01T14:09:58.999Z", "dateUpdated": "2026-08-05T08:56:26.437Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:56:26.437Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: dev: fix skb drop check\n\nIn commit a6d190f8c767 (\"can: skb: drop tx skb if in listen only\nmode\") the priv->ctrlmode element is read even on virtual CAN\ninterfaces that do not create the struct can_priv at startup. This\nout-of-bounds read may lead to CAN frame drops for virtual CAN\ninterfaces like vcan and vxcan.\n\nThis patch mainly reverts the original commit and adds a new helper\nfor CAN interface drivers that provide the required information in\nstruct can_priv.\n\n[mkl: patch pch_can, too]" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is triggered by transmitting on virtual CAN interfaces (vcan/vxcan) via AF_CAN or packet sockets, which requires local system access rather than remote network or adjacent CAN-bus reachability.\nAC:L - An attacker who can send on a vcan/vxcan interface reliably hits the bad `priv->ctrlmode` read on every TX; no race or uncontrolled external condition is required.\nPR:L - An unprivileged user can create vcan in a user namespace (CAP_NET_ADMIN via userns) or send on an existing vcan with AF_CAN, which needs no elevated capability beyond a basic local account.\nUI:N - Exploitation requires only attacker-controlled socket sends on the virtual CAN device; no victim action is needed.\nS:U - Impact remains within the local kernel/host authority; this is not a VM escape, IOMMU bypass, or other cross-boundary breakout.\nC:H - The defect is a CWE-125 out-of-bounds/wrong-object read of kernel memory via a miscast `can_priv`; per kernel OOB-read guidance this is scored High when severity is uncertain.\nI:N - The bad access is read-only and only influences whether an skb is dropped; it provides no write primitive or control-flow hijack.\nA:H - When the misread bits look like CAN_CTRLMODE_LISTENONLY, TX frames on vcan/vxcan are dropped, enabling a complete DoS of that interface’s transmit path." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/can/at91_can.c", "drivers/net/can/c_can/c_can_main.c", "drivers/net/can/can327.c", "drivers/net/can/cc770/cc770.c", "drivers/net/can/ctucanfd/ctucanfd_base.c", "drivers/net/can/dev/skb.c", "drivers/net/can/flexcan/flexcan-core.c", "drivers/net/can/grcan.c", "drivers/net/can/ifi_canfd/ifi_canfd.c", "drivers/net/can/janz-ican3.c", "drivers/net/can/kvaser_pciefd.c", "drivers/net/can/m_can/m_can.c", "drivers/net/can/mscan/mscan.c", "drivers/net/can/pch_can.c", "drivers/net/can/peak_canfd/peak_canfd.c", "drivers/net/can/rcar/rcar_can.c", "drivers/net/can/rcar/rcar_canfd.c", "drivers/net/can/sja1000/sja1000.c", "drivers/net/can/slcan/slcan-core.c", "drivers/net/can/softing/softing_main.c", "drivers/net/can/spi/hi311x.c", "drivers/net/can/spi/mcp251x.c", "drivers/net/can/spi/mcp251xfd/mcp251xfd-tx.c", "drivers/net/can/sun4i_can.c", "drivers/net/can/ti_hecc.c", "drivers/net/can/usb/ems_usb.c", "drivers/net/can/usb/esd_usb.c", "drivers/net/can/usb/etas_es58x/es58x_core.c", "drivers/net/can/usb/gs_usb.c", "drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c", "drivers/net/can/usb/mcba_usb.c", "drivers/net/can/usb/peak_usb/pcan_usb_core.c", "drivers/net/can/usb/ucan.c", "drivers/net/can/usb/usb_8dev.c", "drivers/net/can/xilinx_can.c", "include/linux/can/dev.h" ], "versions": [ { "version": "a6d190f8c7670068d8c154ef8477eca07b5e3574", "lessThan": "386c49fe31ee748e053860b3bac7794a933ac9ac", "status": "affected", "versionType": "git" }, { "version": "a6d190f8c7670068d8c154ef8477eca07b5e3574", "lessThan": "ae64438be1923e3c1102d90fd41db7afcfaf54cc", "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/can/at91_can.c", "drivers/net/can/c_can/c_can_main.c", "drivers/net/can/can327.c", "drivers/net/can/cc770/cc770.c", "drivers/net/can/ctucanfd/ctucanfd_base.c", "drivers/net/can/dev/skb.c", "drivers/net/can/flexcan/flexcan-core.c", "drivers/net/can/grcan.c", "drivers/net/can/ifi_canfd/ifi_canfd.c", "drivers/net/can/janz-ican3.c", "drivers/net/can/kvaser_pciefd.c", "drivers/net/can/m_can/m_can.c", "drivers/net/can/mscan/mscan.c", "drivers/net/can/pch_can.c", "drivers/net/can/peak_canfd/peak_canfd.c", "drivers/net/can/rcar/rcar_can.c", "drivers/net/can/rcar/rcar_canfd.c", "drivers/net/can/sja1000/sja1000.c", "drivers/net/can/slcan/slcan-core.c", "drivers/net/can/softing/softing_main.c", "drivers/net/can/spi/hi311x.c", "drivers/net/can/spi/mcp251x.c", "drivers/net/can/spi/mcp251xfd/mcp251xfd-tx.c", "drivers/net/can/sun4i_can.c", "drivers/net/can/ti_hecc.c", "drivers/net/can/usb/ems_usb.c", "drivers/net/can/usb/esd_usb.c", "drivers/net/can/usb/etas_es58x/es58x_core.c", "drivers/net/can/usb/gs_usb.c", "drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c", "drivers/net/can/usb/mcba_usb.c", "drivers/net/can/usb/peak_usb/pcan_usb_core.c", "drivers/net/can/usb/ucan.c", "drivers/net/can/usb/usb_8dev.c", "drivers/net/can/xilinx_can.c", "include/linux/can/dev.h" ], "versions": [ { "version": "6.0", "status": "affected" }, { "version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.9", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "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": "6.0", "versionEndExcluding": "6.0.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/386c49fe31ee748e053860b3bac7794a933ac9ac" }, { "url": "https://git.kernel.org/stable/c/ae64438be1923e3c1102d90fd41db7afcfaf54cc" } ], "title": "can: dev: fix skb drop check", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-125", "lang": "en", "description": "CWE-125 Out-of-bounds Read" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2025-10-01T17:00:29.049207Z", "id": "CVE-2022-49844", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T17:00:34.409Z" } } ] } }