156 lines
8.4 KiB
JSON
156 lines
8.4 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2022-49783",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2025-05-01T14:05:17.223Z",
|
|
"datePublished": "2025-05-01T14:09:17.054Z",
|
|
"dateUpdated": "2026-11-05T19:49:48.263Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-05-11T19:06:41.833Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/fpu: Drop fpregs lock before inheriting FPU permissions\n\nMike Galbraith reported the following against an old fork of preempt-rt\nbut the same issue also applies to the current preempt-rt tree.\n\n BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:46\n in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: systemd\n preempt_count: 1, expected: 0\n RCU nest depth: 0, expected: 0\n Preemption disabled at:\n fpu_clone\n CPU: 6 PID: 1 Comm: systemd Tainted: G E (unreleased)\n Call Trace:\n <TASK>\n dump_stack_lvl\n ? fpu_clone\n __might_resched\n rt_spin_lock\n fpu_clone\n ? copy_thread\n ? copy_process\n ? shmem_alloc_inode\n ? kmem_cache_alloc\n ? kernel_clone\n ? __do_sys_clone\n ? do_syscall_64\n ? __x64_sys_rt_sigprocmask\n ? syscall_exit_to_user_mode\n ? do_syscall_64\n ? syscall_exit_to_user_mode\n ? do_syscall_64\n ? syscall_exit_to_user_mode\n ? do_syscall_64\n ? exc_page_fault\n ? entry_SYSCALL_64_after_hwframe\n </TASK>\n\nMike says:\n\n The splat comes from fpu_inherit_perms() being called under fpregs_lock(),\n and us reaching the spin_lock_irq() therein due to fpu_state_size_dynamic()\n returning true despite static key __fpu_state_size_dynamic having never\n been enabled.\n\nMike's assessment looks correct. fpregs_lock on a PREEMPT_RT kernel disables\npreemption so calling spin_lock_irq() in fpu_inherit_perms() is unsafe. This\nproblem exists since commit\n\n 9e798e9aa14c (\"x86/fpu: Prepare fpu_clone() for dynamically enabled features\").\n\nEven though the original bug report should not have enabled the paths at\nall, the bug still exists.\n\nfpregs_lock is necessary when editing the FPU registers or a task's FP\nstate but it is not necessary for fpu_inherit_perms(). The only write\nof any FP state in fpu_inherit_perms() is for the new child which is\nnot running yet and cannot context switch or be borrowed by a kernel\nthread yet. Hence, fpregs_lock is not protecting anything in the new\nchild until clone() completes and can be dropped earlier. The siglock\nstill needs to be acquired by fpu_inherit_perms() as the read of the\nparent's permissions has to be serialised.\n\n [ bp: Cleanup splat. ]"
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"arch/x86/kernel/fpu/core.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "9e798e9aa14c45fb94e47b30bf6347b369ce9df7",
|
|
"lessThan": "c6e8a7a1780af3da65e78a615f7d0874da6aabb0",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "9e798e9aa14c45fb94e47b30bf6347b369ce9df7",
|
|
"lessThan": "36b038791e1e2baea892e9276588815fd14894b4",
|
|
"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/x86/kernel/fpu/core.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "5.16",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "5.16",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.0.10",
|
|
"lessThanOrEqual": "6.0.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.1",
|
|
"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": "5.16",
|
|
"versionEndExcluding": "6.0.10"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "5.16",
|
|
"versionEndExcluding": "6.1"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/c6e8a7a1780af3da65e78a615f7d0874da6aabb0"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/36b038791e1e2baea892e9276588815fd14894b4"
|
|
}
|
|
],
|
|
"title": "x86/fpu: Drop fpregs lock before inheriting FPU permissions",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
},
|
|
"adp": [
|
|
{
|
|
"metrics": [
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"id": "CVE-2022-49783",
|
|
"role": "CISA Coordinator",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "partial"
|
|
}
|
|
],
|
|
"version": "2.0.3",
|
|
"timestamp": "2026-11-05T19:47:48.628453Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2026-11-05T19:49:48.263Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |