{"dataType":"CVE_RECORD","cveMetadata":{"cveId":"CVE-2024-35871","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-17T13:50:33.108Z","datePublished":"2024-05-19T08:34:29.292Z","dateUpdated":"2026-05-11T20:12:52.641Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T20:12:52.641Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: process: Fix kernel gp leakage\n\nchildregs represents the registers which are active for the new thread\nin user context. For a kernel thread, childregs->gp is never used since\nthe kernel gp is not touched by switch_to. For a user mode helper, the\ngp value can be observed in user space after execve or possibly by other\nmeans.\n\n[From the email thread]\n\nThe /* Kernel thread */ comment is somewhat inaccurate in that it is also used\nfor user_mode_helper threads, which exec a user process, e.g. /sbin/init or\nwhen /proc/sys/kernel/core_pattern is a pipe. Such threads do not have\nPF_KTHREAD set and are valid targets for ptrace etc. even before they exec.\n\nchildregs is the *user* context during syscall execution and it is observable\nfrom userspace in at least five ways:\n\n1. kernel_execve does not currently clear integer registers, so the starting\n   register state for PID 1 and other user processes started by the kernel has\n   sp = user stack, gp = kernel __global_pointer$, all other integer registers\n   zeroed by the memset in the patch comment.\n\n   This is a bug in its own right, but I'm unwilling to bet that it is the only\n   way to exploit the issue addressed by this patch.\n\n2. ptrace(PTRACE_GETREGSET): you can PTRACE_ATTACH to a user_mode_helper thread\n   before it execs, but ptrace requires SIGSTOP to be delivered which can only\n   happen at user/kernel boundaries.\n\n3. /proc/*/task/*/syscall: this is perfectly happy to read pt_regs for\n   user_mode_helpers before the exec completes, but gp is not one of the\n   registers it returns.\n\n4. PERF_SAMPLE_REGS_USER: LOCKDOWN_PERF normally prevents access to kernel\n   addresses via PERF_SAMPLE_REGS_INTR, but due to this bug kernel addresses\n   are also exposed via PERF_SAMPLE_REGS_USER which is permitted under\n   LOCKDOWN_PERF. I have not attempted to write exploit code.\n\n5. Much of the tracing infrastructure allows access to user registers. I have\n   not attempted to determine which forms of tracing allow access to user\n   registers without already allowing access to kernel registers."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/riscv/kernel/process.c"],"versions":[{"version":"7db91e57a0acde126a162ababfb1e0ab190130cb","lessThan":"9abc3e6f1116adb7a2d4fbb8ce20c37916976bf5","status":"affected","versionType":"git"},{"version":"7db91e57a0acde126a162ababfb1e0ab190130cb","lessThan":"dff6072124f6df77bfd36951fbd88565746980ef","status":"affected","versionType":"git"},{"version":"7db91e57a0acde126a162ababfb1e0ab190130cb","lessThan":"f6583444d7e78dae750798552b65a2519ff3ca84","status":"affected","versionType":"git"},{"version":"7db91e57a0acde126a162ababfb1e0ab190130cb","lessThan":"00effef72c98294edb1efa87ffa0f6cfb61b36a4","status":"affected","versionType":"git"},{"version":"7db91e57a0acde126a162ababfb1e0ab190130cb","lessThan":"d8dcba0691b8e42bddb61aab201e4d918a08e5d9","status":"affected","versionType":"git"},{"version":"7db91e57a0acde126a162ababfb1e0ab190130cb","lessThan":"d14fa1fcf69db9d070e75f1c4425211fa619dfc8","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/riscv/kernel/process.c"],"versions":[{"version":"4.15","status":"affected"},{"version":"0","lessThan":"4.15","status":"unaffected","versionType":"semver"},{"version":"5.10.216","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.154","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.85","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.26","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.8.5","lessThanOrEqual":"6.8.*","status":"unaffected","versionType":"semver"},{"version":"6.9","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":"4.15","versionEndExcluding":"5.10.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"5.15.154"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.1.85"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.6.26"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.8.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"6.9"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/9abc3e6f1116adb7a2d4fbb8ce20c37916976bf5"},{"url":"https://git.kernel.org/stable/c/dff6072124f6df77bfd36951fbd88565746980ef"},{"url":"https://git.kernel.org/stable/c/f6583444d7e78dae750798552b65a2519ff3ca84"},{"url":"https://git.kernel.org/stable/c/00effef72c98294edb1efa87ffa0f6cfb61b36a4"},{"url":"https://git.kernel.org/stable/c/d8dcba0691b8e42bddb61aab201e4d918a08e5d9"},{"url":"https://git.kernel.org/stable/c/d14fa1fcf69db9d070e75f1c4425211fa619dfc8"}],"title":"riscv: process: Fix kernel gp leakage","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-06-17T17:38:51.778237Z","id":"CVE-2024-35871","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-06-17T17:41:55.174Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-02T03:21:49.064Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/9abc3e6f1116adb7a2d4fbb8ce20c37916976bf5","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/dff6072124f6df77bfd36951fbd88565746980ef","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/f6583444d7e78dae750798552b65a2519ff3ca84","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/00effef72c98294edb1efa87ffa0f6cfb61b36a4","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/d8dcba0691b8e42bddb61aab201e4d918a08e5d9","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/d14fa1fcf69db9d070e75f1c4425211fa619dfc8","tags":["x_transferred"]},{"url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html","tags":["x_transferred"]}]}]},"dataVersion":"5.2"}