{"id":"CVE-2026-98951","state":"PUBLISHED","title":"riscv: ptrace: Zero-initialize regset buffers before copyin","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: ptrace: Zero-initialize regset buffers before copyin\n\nuser_regset_copyin() only copies `count` bytes, so a PTRACE_SETREGSET\nrequest with a short iov_len leaves the rest of the stack buffer\nuninitialized. In riscv_vr_set() that garbage is validated and copied\ninto the target's vstate, and in riscv_cfi_set() it can be stored as\nthe target's shadow stack pointer. Zero both buffers, as the get path\nalready does.","publishedAt":"2026-10-23T12:19:10.747Z","updatedAt":"2026-10-23T12:19:10.747Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9300f00439743c4a34d735e1a27118eb68a1504e","status":"affected","lessThan":"89fc70d73f4ac8781f9e15edd1dbc6b6088453b3","versionType":"git"},{"version":"9300f00439743c4a34d735e1a27118eb68a1504e","status":"affected","lessThan":"59052a88ba5fe4a7bb34b3a0a42aa5d453d3bb97","versionType":"git"},{"version":"f2a9cd050901c4734bc175294c3bd6a40a1a9e99","status":"affected","versionType":"git"},{"version":"6.5.3","status":"affected","lessThan":"6.6","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/riscv/kernel/ptrace.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/riscv/kernel/ptrace.c"]}],"references":["https://git.kernel.org/stable/c/89fc70d73f4ac8781f9e15edd1dbc6b6088453b3","https://git.kernel.org/stable/c/59052a88ba5fe4a7bb34b3a0a42aa5d453d3bb97"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98951.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98951","state":"PUBLISHED","datePublished":"2026-10-23T12:19:10.747Z","dateUpdated":"2026-10-23T12:19:10.747Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.382Z"},"containers":{"cna":{"title":"riscv: ptrace: Zero-initialize regset buffers before copyin","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: ptrace: Zero-initialize regset buffers before copyin\n\nuser_regset_copyin() only copies `count` bytes, so a PTRACE_SETREGSET\nrequest with a short iov_len leaves the rest of the stack buffer\nuninitialized. In riscv_vr_set() that garbage is validated and copied\ninto the target's vstate, and in riscv_cfi_set() it can be stored as\nthe target's shadow stack pointer. Zero both buffers, as the get path\nalready does."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9300f00439743c4a34d735e1a27118eb68a1504e","status":"affected","lessThan":"89fc70d73f4ac8781f9e15edd1dbc6b6088453b3","versionType":"git"},{"version":"9300f00439743c4a34d735e1a27118eb68a1504e","status":"affected","lessThan":"59052a88ba5fe4a7bb34b3a0a42aa5d453d3bb97","versionType":"git"},{"version":"f2a9cd050901c4734bc175294c3bd6a40a1a9e99","status":"affected","versionType":"git"},{"version":"6.5.3","status":"affected","lessThan":"6.6","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/riscv/kernel/ptrace.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/riscv/kernel/ptrace.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/89fc70d73f4ac8781f9e15edd1dbc6b6088453b3"},{"url":"https://git.kernel.org/stable/c/59052a88ba5fe4a7bb34b3a0a42aa5d453d3bb97"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-23T12:19:10.747Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.2.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}