{"id":"CVE-2026-68473","state":"PUBLISHED","title":"powerpc/uaccess: correct check for CONFIG_PPC_E500 in mask_user_address()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/uaccess: correct check for CONFIG_PPC_E500 in mask_user_address()\n\nmask_user_address() incorrectly checks for CONFIG_E500 instead of\nCONFIG_PPC_E500, causing mask_user_address_isel() to not be used on\nE500 hardware. Fix the check to use the correct name.","publishedAt":"2026-08-15T05:51:30.274Z","updatedAt":"2026-08-17T05:39:16.211Z","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":"861574d51bbd7a06dbf07f658a9a8def012c2f74","status":"affected","lessThan":"d5c234774a82f27b594f70c15fc45ce3648e4295","versionType":"git"},{"version":"861574d51bbd7a06dbf07f658a9a8def012c2f74","status":"affected","lessThan":"d610d3ab18197d87618da11ec5fe8b3cebf32208","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/powerpc/include/asm/uaccess.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"7.0","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/powerpc/include/asm/uaccess.h"]}],"references":["https://git.kernel.org/stable/c/d5c234774a82f27b594f70c15fc45ce3648e4295","https://git.kernel.org/stable/c/d610d3ab18197d87618da11ec5fe8b3cebf32208"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/68xxx/CVE-2026-68473.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68473","state":"PUBLISHED","datePublished":"2026-08-15T05:51:30.274Z","dateUpdated":"2026-08-17T05:39:16.211Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-30T09:28:09.396Z"},"containers":{"cna":{"title":"powerpc/uaccess: correct check for CONFIG_PPC_E500 in mask_user_address()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/uaccess: correct check for CONFIG_PPC_E500 in mask_user_address()\n\nmask_user_address() incorrectly checks for CONFIG_E500 instead of\nCONFIG_PPC_E500, causing mask_user_address_isel() to not be used on\nE500 hardware. Fix the check to use the correct name."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"861574d51bbd7a06dbf07f658a9a8def012c2f74","status":"affected","lessThan":"d5c234774a82f27b594f70c15fc45ce3648e4295","versionType":"git"},{"version":"861574d51bbd7a06dbf07f658a9a8def012c2f74","status":"affected","lessThan":"d610d3ab18197d87618da11ec5fe8b3cebf32208","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/powerpc/include/asm/uaccess.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"7.0","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/powerpc/include/asm/uaccess.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/d5c234774a82f27b594f70c15fc45ce3648e4295"},{"url":"https://git.kernel.org/stable/c/d610d3ab18197d87618da11ec5fe8b3cebf32208"}],"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 - Exploitation requires invoking local syscalls (read/write/ioctl/futex/socket) that reach masked uaccess helpers; the bug is in arch/powerpc uaccess.h and is not triggered by remote packet handling alone.\nAC:L - On affected PPC_E500 kernels (7.0+), any user pointer with bit 31 set reliably redirects to 0x80000000 on masked copy/futex paths without races or rare layout wins.\nPR:L - Any unprivileged local process can pass crafted userspace pointers into copy_from_user, strncpy_from_user, iov_iter, futex_wake_op, and scoped socket/scm helpers that use masked_user_access_begin.\nUI:N - No victim interaction is required; exploitation is achieved entirely through attacker-controlled syscall arguments and memory mappings.\nS:U - Impact is confined to kernel/user memory boundaries on the same host (cross-process read/write via misdirected uaccess), not a hypervisor or separate security authority escape.\nC:H - Wrong masking lets masked copy_from_user/strncpy_from_user read from 0x80000000 instead of the supplied high user or kernel-range pointer, enabling kernel-mediated disclosure of other mappings at that fixed address.\nI:H - Masked futex atomic ops and scoped user writes on mis-masked pointers can modify memory at 0x80000000 rather than the validated target, corrupting synchronization state or arbitrary user data.\nA:H - Misdirected user accesses can trigger KUAP/KUEP faults, WARN paths, or persistent futex corruption, causing kernel oops/panics or denial of service on embedded E500 systems."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:39:16.211Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}