CVE-2026-89978

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89978", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.779Z", "datePublished": "2026-09-16T10:32:55.928Z", "dateUpdated": "2026-10-19T08:55:52.997Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:55:52.997Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/amdxdna: return early from a zero-length flush\n\nSYNC_BO does not constrain its size, so a request for zero bytes reaches\ndrm_clflush_virt_range(), which ends with an unconditional\nclflushopt(end - 1). For an empty range that is the byte before the\nmapping, and abo->mem.kva comes from vmap(), so the access lands in the\nguard page below the vmalloc area and faults:\n\n BUG: unable to handle page fault for address: ffffd16fbbc70fff\n #PF: supervisor read access in kernel mode\n Oops: Oops: 0000 [#1] SMP NOPTI\n CPU: 7 UID: 1000 Comm: sync_bo_probe\n RIP: 0010:drm_clflush_virt_range+0x3c/0x70\n Call Trace:\n amdxdna_drm_sync_bo_ioctl+0x124/0x430 [amdxdna]\n drm_ioctl+0x301/0x4c0\n __x64_sys_ioctl+0x115/0x2f0\n do_syscall_64+0xa6/0x3d0\n\nAny process that can open the render node can do this. Reproduced 3 of 3\ntimes on a Strix Point NPU (1022:17f0), by calling SYNC_BO with size 0 on\nan AMDXDNA_BO_SHARE object. The import arm takes the same request but\nflushes the whole scatterlist, so it survives it.\n\nNothing needs flushing for an empty range, so answer before choosing a\npath."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/accel/amdxdna/amdxdna_gem.c"], "versions": [{"version": "e252e3f3488a49267e08ea7d972ac5ba3f2f1763", "lessThan": "45962da5821d0a691f638ccb13842889156d8969", "status": "affected", "versionType": "git"}, {"version": "e252e3f3488a49267e08ea7d972ac5ba3f2f1763", "lessThan": "f00def884a831dc49eb659dac2dd09dbfd21e67f", "status": "affected", "versionType": "git"}, {"version": "e252e3f3488a49267e08ea7d972ac5ba3f2f1763", "lessThan": "dc14753664240cedf669623b27ae9922b0618b25", "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/accel/amdxdna/amdxdna_gem.c"], "versions": [{"version": "6.17", "status": "affected"}, {"version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.5", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "6.17", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.2.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/45962da5821d0a691f638ccb13842889156d8969"}, {"url": "https://git.kernel.org/stable/c/f00def884a831dc49eb659dac2dd09dbfd21e67f"}, {"url": "https://git.kernel.org/stable/c/dc14753664240cedf669623b27ae9922b0618b25"}], "title": "accel/amdxdna: return early from a zero-length flush", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/accel/amdxdna/amdxdna_gem.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "45962da5821d0a691f638ccb13842889156d8969", "status": "affected", "version": "e252e3f3488a49267e08ea7d972ac5ba3f2f1763", "versionType": "git"}, {"lessThan": "f00def884a831dc49eb659dac2dd09dbfd21e67f", "status": "affected", "version": "e252e3f3488a49267e08ea7d972ac5ba3f2f1763", "versionType": "git"}, {"lessThan": "dc14753664240cedf669623b27ae9922b0618b25", "status": "affected", "version": "e252e3f3488a49267e08ea7d972ac5ba3f2f1763", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/accel/amdxdna/amdxdna_gem.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.17"}, {"lessThan": "6.17", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/amdxdna: return early from a zero-length flush\n\nSYNC_BO does not constrain its size, so a request for zero bytes reaches\ndrm_clflush_virt_range(), which ends with an unconditional\nclflushopt(end - 1). For an empty range that is the byte before the\nmapping, and abo->mem.kva comes from vmap(), so the access lands in the\nguard page below the vmalloc area and faults:\n\n BUG: unable to handle page fault for address: ffffd16fbbc70fff\n #PF: supervisor read access in kernel mode\n Oops: Oops: 0000 [#1] SMP NOPTI\n CPU: 7 UID: 1000 Comm: sync_bo_probe\n RIP: 0010:drm_clflush_virt_range+0x3c/0x70\n Call Trace:\n amdxdna_drm_sync_bo_ioctl+0x124/0x430 [amdxdna]\n drm_ioctl+0x301/0x4c0\n __x64_sys_ioctl+0x115/0x2f0\n do_syscall_64+0xa6/0x3d0\n\nAny process that can open the render node can do this. Reproduced 3 of 3\ntimes on a Strix Point NPU (1022:17f0), by calling SYNC_BO with size 0 on\nan AMDXDNA_BO_SHARE object. The import arm takes the same request but\nflushes the whole scatterlist, so it survives it.\n\nNothing needs flushing for an empty range, so answer before choosing a\npath."}], "id": "CVE-2026-89978", "lastModified": "2026-10-19T09:18:44.607", "metrics": {}, "published": "2026-09-16T11:17:08.667", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/45962da5821d0a691f638ccb13842889156d8969"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dc14753664240cedf669623b27ae9922b0618b25"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f00def884a831dc49eb659dac2dd09dbfd21e67f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e252e3f3488a49267e08ea7d972ac5ba3f2f1763,45962da5821d0a691f638ccb13842889156d8969)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e252e3f3488a49267e08ea7d972ac5ba3f2f1763,f00def884a831dc49eb659dac2dd09dbfd21e67f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e252e3f3488a49267e08ea7d972ac5ba3f2f1763,dc14753664240cedf669623b27ae9922b0618b25)"}}], "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": "6.17"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.17)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.52,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.5,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc2,*]"}}], "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"}], "created": "2026-09-17T13:15:12.758412+00:00", "updated": "2026-09-18T04:15:02.515468+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-125"]}