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vuln-cve/data/2024/35xxx/CVE-2024-35871.json
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{
"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": [
{
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"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"arch/riscv/kernel/process.c"
],
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"lessThan": "9abc3e6f1116adb7a2d4fbb8ce20c37916976bf5",
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"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"
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{
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"lessThanOrEqual": "5.15.*",
"status": "unaffected",
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"version": "6.1.85",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
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"lessThanOrEqual": "6.6.*",
"status": "unaffected",
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},
{
"version": "6.8.5",
"lessThanOrEqual": "6.8.*",
"status": "unaffected",
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},
{
"version": "6.9",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
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"cpeApplicability": [
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"nodes": [
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"operator": "OR",
"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"timestamp": "2024-06-17T17:38:51.778237Z",
"id": "CVE-2024-35871",
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