{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43248", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.996Z", "datePublished": "2026-05-06T11:28:39.578Z", "dateUpdated": "2026-08-05T12:26:51.590Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:26:51.590Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost: move vdpa group bound check to vhost_vdpa\n\nRemove duplication by consolidating these here. This reduces the\nposibility of a parent driver missing them.\n\nWhile we're at it, fix a bug in vdpa_sim where a valid ASID can be\nassigned to a group equal to ngroups, causing an out of bound write." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable path is reached through local `ioctl()` calls on a `/dev/vhost-vdpa-*` character device, not by network or adjacent traffic.\nAC:L - The attacker controls the ioctl arguments, including the group index and ASID, and no race or external timing condition is required once the device is accessible.\nPR:L - Creating or binding vDPA devices is administrative, but a delegated/local VM or vDPA process with access to the vhost-vdpa device can trigger the ioctl without further kernel capability checks. Choosing the higher severity option, this is Low rather than High.\nUI:N - No victim user action is needed; the local attacker directly opens the device, becomes vhost owner, and issues the ioctl.\nS:U - The impact is corruption of host kernel memory from a local host device interface, which is a standard kernel privilege/security-domain impact rather than a VM escape or separate authority crossing.\nC:H - The missing group bound permits out-of-bounds kernel heap access in the parent set_group_asid path, and such memory corruption can reasonably be developed into kernel memory disclosure.\nI:H - The bug permits an out-of-bounds kernel write of ASID/group state or adjacent locking/state fields, making kernel memory corruption and potential control-flow or privilege manipulation plausible.\nA:H - Even without full exploitation, the out-of-bounds write can corrupt kernel heap state and can reasonably crash or panic the kernel." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/vdpa/mlx5/net/mlx5_vnet.c", "drivers/vdpa/vdpa_sim/vdpa_sim.c", "drivers/vhost/vdpa.c" ], "versions": [ { "version": "bda324fd037a6b0d44da5699574ce741ca161bc4", "lessThan": "ddb57354634b6ba851b79da45f1de42c646f27d0", "status": "affected", "versionType": "git" }, { "version": "bda324fd037a6b0d44da5699574ce741ca161bc4", "lessThan": "7441d35d14d9a3d66d925d90cb73c75394e6d454", "status": "affected", "versionType": "git" }, { "version": "bda324fd037a6b0d44da5699574ce741ca161bc4", "lessThan": "406db68f9cb976a8ddfafd631197264f2307e9c9", "status": "affected", "versionType": "git" }, { "version": "bda324fd037a6b0d44da5699574ce741ca161bc4", "lessThan": "cd025c1e876b4e262e71398236a1550486a73ede", "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/vdpa/mlx5/net/mlx5_vnet.c", "drivers/vdpa/vdpa_sim/vdpa_sim.c", "drivers/vhost/vdpa.c" ], "versions": [ { "version": "5.19", "status": "affected" }, { "version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.6", "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": "5.19", "versionEndExcluding": "6.12.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.18.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.19.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ddb57354634b6ba851b79da45f1de42c646f27d0" }, { "url": "https://git.kernel.org/stable/c/7441d35d14d9a3d66d925d90cb73c75394e6d454" }, { "url": "https://git.kernel.org/stable/c/406db68f9cb976a8ddfafd631197264f2307e9c9" }, { "url": "https://git.kernel.org/stable/c/cd025c1e876b4e262e71398236a1550486a73ede" } ], "title": "vhost: move vdpa group bound check to vhost_vdpa", "x_generator": { "engine": "bippy-1.2.0" } } } }