{"id":"CVE-2026-43248","state":"PUBLISHED","title":"vhost: move vdpa group bound check to vhost_vdpa","description":"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.","publishedAt":"2026-05-06T11:28:39.578Z","updatedAt":"2026-10-30T12:25:16.645Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"bda324fd037a6b0d44da5699574ce741ca161bc4","status":"affected","lessThan":"69ec8dd6696069c2f18430d0e05f81d604484ee8","versionType":"git"},{"version":"bda324fd037a6b0d44da5699574ce741ca161bc4","status":"affected","lessThan":"566899af053246406f2faf931044d2b0af8f34d2","versionType":"git"},{"version":"bda324fd037a6b0d44da5699574ce741ca161bc4","status":"affected","lessThan":"ddb57354634b6ba851b79da45f1de42c646f27d0","versionType":"git"},{"version":"bda324fd037a6b0d44da5699574ce741ca161bc4","status":"affected","lessThan":"7441d35d14d9a3d66d925d90cb73c75394e6d454","versionType":"git"},{"version":"bda324fd037a6b0d44da5699574ce741ca161bc4","status":"affected","lessThan":"406db68f9cb976a8ddfafd631197264f2307e9c9","versionType":"git"},{"version":"bda324fd037a6b0d44da5699574ce741ca161bc4","status":"affected","lessThan":"cd025c1e876b4e262e71398236a1550486a73ede","versionType":"git"}],"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"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"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"]}],"references":["https://git.kernel.org/stable/c/69ec8dd6696069c2f18430d0e05f81d604484ee8","https://git.kernel.org/stable/c/566899af053246406f2faf931044d2b0af8f34d2","https://git.kernel.org/stable/c/ddb57354634b6ba851b79da45f1de42c646f27d0","https://git.kernel.org/stable/c/7441d35d14d9a3d66d925d90cb73c75394e6d454","https://git.kernel.org/stable/c/406db68f9cb976a8ddfafd631197264f2307e9c9","https://git.kernel.org/stable/c/cd025c1e876b4e262e71398236a1550486a73ede"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-30T12:42:04.495Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43248.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43248","state":"PUBLISHED","datePublished":"2026-05-06T11:28:39.578Z","dateUpdated":"2026-10-30T12:25:16.645Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.996Z"},"containers":{"cna":{"title":"vhost: move vdpa group bound check to vhost_vdpa","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"bda324fd037a6b0d44da5699574ce741ca161bc4","status":"affected","lessThan":"69ec8dd6696069c2f18430d0e05f81d604484ee8","versionType":"git"},{"version":"bda324fd037a6b0d44da5699574ce741ca161bc4","status":"affected","lessThan":"566899af053246406f2faf931044d2b0af8f34d2","versionType":"git"},{"version":"bda324fd037a6b0d44da5699574ce741ca161bc4","status":"affected","lessThan":"ddb57354634b6ba851b79da45f1de42c646f27d0","versionType":"git"},{"version":"bda324fd037a6b0d44da5699574ce741ca161bc4","status":"affected","lessThan":"7441d35d14d9a3d66d925d90cb73c75394e6d454","versionType":"git"},{"version":"bda324fd037a6b0d44da5699574ce741ca161bc4","status":"affected","lessThan":"406db68f9cb976a8ddfafd631197264f2307e9c9","versionType":"git"},{"version":"bda324fd037a6b0d44da5699574ce741ca161bc4","status":"affected","lessThan":"cd025c1e876b4e262e71398236a1550486a73ede","versionType":"git"}],"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"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"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"]}],"references":[{"url":"https://git.kernel.org/stable/c/69ec8dd6696069c2f18430d0e05f81d604484ee8"},{"url":"https://git.kernel.org/stable/c/566899af053246406f2faf931044d2b0af8f34d2"},{"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"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:25:16.645Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.6.160"},{"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-43248","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:16:04.394477Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","lang":"en","type":"CWE","description":"CWE-787 Out-of-bounds Write"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:16:25.299Z"}}]}}}