7.8

CVE-2026-52973

futex: Drop CLONE_THREAD requirement for private default hash alloc

In the Linux kernel, the following vulnerability has been resolved:

futex: Drop CLONE_THREAD requirement for private default hash alloc

Currently need_futex_hash_allocate_default() depends on strict pthread
semantics, abusing CLONE_THREAD.  This breaks the non-concurrency
assumptions when doing the mm->futex_ref pcpu allocations, leading to
bugs[0] when sharing the mm in other ways; ie:

    BUG: KASAN: slab-use-after-free in futex_hash_put

... where the +1 bias can end up on a percpu counter that mm->futex_ref
no longer points at.

Loosen the check to cover any CLONE_VM clone, except vfork().  Excluding
vfork keeps the existing paths untouched (no overhead), and we can't
race in the first place: either the parent is suspended and the child
runs alone, or mm->futex_ref is already allocated from an earlier
CLONE_VM.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 6.17.1 < 6.18.33
Linux ≫ Linux Kernel Version >= 6.19 < 7.0.10
Linux ≫ Linux Kernel Version6.17 Update-
Linux ≫ Linux Kernel Version6.17 Updaterc5
Linux ≫ Linux Kernel Version6.17 Updaterc6
Linux ≫ Linux Kernel Version6.17 Updaterc7
Linux ≫ Linux Kernel Version7.1 Updaterc1
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.14% 0.039
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 7 1 5.9
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

CWE-825 Expired Pointer Dereference

The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid.

https://git.kernel.org/stable/c/1dcd36420af2da5bd59306dba9caf78e3d248b1d
Patch
https://git.kernel.org/stable/c/974ac49a9a068b0591a59f65c63eb06579a13091
Patch
https://git.kernel.org/stable/c/ee9dce44362b2d8132c32964656ab6dff7dfbc6a
Patch
https://bugzilla.redhat.com/show_bug.cgi?id=2492413
Third Party Advisory
Issue Tracking
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52973.json
Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-52973
Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:45114
https://access.redhat.com/errata/RHSA-2026:47040