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 das CVE Programm von Authorized Data Publishers (ADP) (Unstrukturiert)
HerstellerRed Hat
≫
Produkt Red Hat Enterprise Linux 10
Default Statusaffected
HerstellerRed Hat
≫
Produkt Red Hat Enterprise Linux 9
Default Statusaffected
HerstellerRed Hat
≫
Produkt Red Hat Enterprise Linux 6
Default Statusunaffected
HerstellerRed Hat
≫
Produkt Red Hat Enterprise Linux 7
Default Statusunaffected
HerstellerRed Hat
≫
Produkt Red Hat Enterprise Linux 8
Default Statusunaffected
VulnDex Vulnerability Enrichment
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.13% 0.028
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-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The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid.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
https://git.kernel.org/stable/c/974ac49a9a068b0591a59f65c63eb06579a13091
https://git.kernel.org/stable/c/ee9dce44362b2d8132c32964656ab6dff7dfbc6a
https://bugzilla.redhat.com/show_bug.cgi?id=2492413
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52973.json
https://access.redhat.com/security/cve/CVE-2026-52973