uprobes: Fix NULL pointer dereference in hprobe_expire()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74477
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:52 UTC
Updated2026-08-17 06:19:43 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: uprobes: Fix NULL pointer dereference in hprobe_expire() Forking a task that has a pending uretprobe can oops the kernel with a NULL pointer dereference in the clone() path: BUG: kernel NULL pointer dereference, address: 0000000000000018 Oops: 0002 [#1] SMP NOPTI RIP: 0010:hprobe_expire CR2: 0000000000000018 Call Trace: uprobe_copy_process copy_process kernel_clone __x64_sys_clone do_syscall_64 entry_SYSCALL_64_after_hwframe This was found on real hosts on Meta fleet. I've got the impression that this is what is happening: CPU 1 CPU 2 (traced task) ----- ------------------- hit uprobe, prepare_uretprobe(): hprobe LEASED, refcount >= 1 uprobe_unregister() put_uprobe(): refcount -> 0 fork() -> dup_utask() hprobe_expire(hprobe, true) try_get_uprobe() -> NULL get_uprobe(NULL) <-- Oops Only take the extra reference when the uprobe is non-NULL; a NULL means it is gone and is the correct value to return.

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.063150000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected dd1a7567784e2b1f80258be04f57bcfa82c997eb 3bd35a5e272a1b7a3fb43acad9bdc599281b13fa git Not specified
CNA Linux Linux affected dd1a7567784e2b1f80258be04f57bcfa82c997eb 06c275a6c0a953ef1d763d11a6891fcc69ae2ac0 git Not specified
CNA Linux Linux affected dd1a7567784e2b1f80258be04f57bcfa82c997eb cc679d7a6303e84d769f2afcde1fc51c51f127cd git Not specified
CNA Linux Linux affected 6.13 Not specified
CNA Linux Linux unaffected 6.13 semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/06c275a6c0a953ef1d763d11a6891fcc69ae2ac0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3bd35a5e272a1b7a3fb43acad9bdc599281b13fa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cc679d7a6303e84d769f2afcde1fc51c51f127cd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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