CVE-2026-23415
published 2026-04-02CVE-2026-23415: In the Linux kernel, the following vulnerability has been resolved: futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy() During…
PriorityP340high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.12%
2.5th percentile
In the Linux kernel, the following vulnerability has been resolved:
futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
During futex_key_to_node_opt() execution, vma->vm_policy is read under
speculative mmap lock and RCU. Concurrently, mbind() may call
vma_replace_policy() which frees the old mempolicy immediately via
kmem_cache_free().
This creates a race where __futex_key_to_node() dereferences a freed
mempolicy pointer, causing a use-after-free read of mpol->mode.
[ 151.412631] BUG: KASAN: slab-use-after-free in __futex_key_to_node (kernel/futex/core.c:349)
[ 151.414046] Read of size 2 at addr ffff888001c49634 by task e/87
[ 151.415969] Call Trace:
[ 151.416732] __asan_load2 (mm/kasan/generic.c:271)
[ 151.416777] __futex_key_to_node (kernel/futex/core.c:349)
[ 151.416822] get_futex_key (kernel/futex/core.c:374 kernel/futex/core.c:386 kernel/futex/core.c:593)
Fix by adding rcu to __mpol_put().
Affected
9 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.19.11-1 (sid) | linux 6.19.11-1 (sid) |
| linux | linux | — | — |
| linux | linux | >= c042c505210dc3453f378df432c10fff3d471bc5 < 853f70c67d1b37e368fdcb3e328c4b8c04f53ac0 | 853f70c67d1b37e368fdcb3e328c4b8c04f53ac0 |
| linux | linux | >= c042c505210dc3453f378df432c10fff3d471bc5 < 7e196194ea27bd49adf3551e2aceb83498eb73fe | 7e196194ea27bd49adf3551e2aceb83498eb73fe |
| linux | linux | >= c042c505210dc3453f378df432c10fff3d471bc5 < 190a8c48ff623c3d67cb295b4536a660db2012aa | 190a8c48ff623c3d67cb295b4536a660db2012aa |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 6.16.1 < 6.18.21 | 6.18.21 |
| linux | linux_kernel | >= 6.19 < 6.19.11 | 6.19.11 |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_redhat5.7MEDIUM
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VulDB
Linux Kernel up to 6.18.20/6.19.10/7.0-rc5 kernel/futex/core.c futex_key_to_node_opt use after free (EUVD-2026-18196 / WID-SEC-2026-0985)
vuldb·2026-06-24·CVSS 7.8
CVE-2026-23415 [HIGH] Linux Kernel up to 6.18.20/6.19.10/7.0-rc5 kernel/futex/core.c futex_key_to_node_opt use after free (EUVD-2026-18196 / WID-SEC-2026-0985)
A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.18.20/6.19.10/7.0-rc5. Affected by this vulnerability is the function futex_key_to_node_opt of the file kernel/futex/core.c. Such manipulation leads to use after free.
This vulnerability is referenced as CVE-2026-23415. The attack needs to be initiated within the local network. No exploit is available.
You should upgrade the affected component.
OSV
CVE-2026-23415: (In the Linux kernel, the following vulnerability has been resolved: f
osv·2026-04-03
CVE-2026-23415 CVE-2026-23415: (In the Linux kernel, the following vulnerability has been resolved: f
(In the Linux kernel, the following vulnerability has been resolved: f ...)
GHSA
GHSA-chr7-rqmr-q86r: In the Linux kernel, the following vulnerability has been resolved:
futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
During f
ghsa_unreviewed·2026-04-02
CVE-2026-23415 GHSA-chr7-rqmr-q86r: In the Linux kernel, the following vulnerability has been resolved:
futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
During f
In the Linux kernel, the following vulnerability has been resolved:
futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
During futex_key_to_node_opt() execution, vma->vm_policy is read under
speculative mmap lock and RCU. Concurrently, mbind() may call
vma_replace_policy() which frees the old mempolicy immediately via
kmem_cache_free().
This creates a race where __futex_key_to_node() dereferences a freed
mempolicy pointer, causing a use-after-free read of mpol->mode.
[ 151.412631] BUG: KASAN: slab-use-after-free in __futex_key_to_node (kernel/futex/core.c:349)
[ 151.414046] Read of size 2 at addr ffff888001c49634 by task e/87
[ 151.415969] Call Trace:
[ 151.416732] __asan_load2 (mm/kasan/generic.c:271)
[ 151.416777] __futex_key_to_node (kernel/futex/core.c:349)
[
OSV
CVE-2026-23415: In the Linux kernel, the following vulnerability has been resolved: futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy() During fut
osv·2026-04-02
CVE-2026-23415 CVE-2026-23415: In the Linux kernel, the following vulnerability has been resolved: futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy() During fut
In the Linux kernel, the following vulnerability has been resolved: futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy() During futex_key_to_node_opt() execution, vma->vm_policy is read under speculative mmap lock and RCU. Concurrently, mbind() may call vma_replace_policy() which frees the old mempolicy immediately via kmem_cache_free(). This creates a race where __futex_key_to_node() dereferences a freed mempolicy pointer, causing a use-after-free read of mpol->mode. [ 151.412631] BUG: KASAN: slab-use-after-free in __futex_key_to_node (kernel/futex/core.c:349) [ 151.414046] Read of size 2 at addr ffff888001c49634 by task e/87 [ 151.415969] Call Trace: [ 151.416732] __asan_load2 (mm/kasan/generic.c:271) [ 151.416777] __futex_key_to_node (kernel/futex/core.c:349) [ 151.41
Red Hat
kernel: futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
vendor_redhat·2026-04-02·CVSS 5.7
CVE-2026-23415 [MEDIUM] CWE-367 kernel: futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
kernel: futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
In the Linux kernel, the following vulnerability has been resolved:
futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
During futex_key_to_node_opt() execution, vma->vm_policy is read under
speculative mmap lock and RCU. Concurrently, mbind() may call
vma_replace_policy() which frees the old mempolicy immediately via
kmem_cache_free().
This creates a race where __futex_key_to_node() dereferences a freed
mempolicy pointer, causing a use-after-free read of mpol->mode.
[ 151.412631] BUG: KASAN: slab-use-after-free in __futex_key_to_node (kernel/futex/core.c:349)
[ 151.414046] Read of size 2 at addr ffff888001c49634 by task e/87
[ 151.415969] Call Trace:
[ 151.416732] __asan_load2 (mm/kasan/ge
Debian
CVE-2026-23415: linux - In the Linux kernel, the following vulnerability has been resolved: futex: Fix ...
vendor_debian·2026
CVE-2026-23415 [LOW] CVE-2026-23415: linux - In the Linux kernel, the following vulnerability has been resolved: futex: Fix ...
In the Linux kernel, the following vulnerability has been resolved: futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy() During futex_key_to_node_opt() execution, vma->vm_policy is read under speculative mmap lock and RCU. Concurrently, mbind() may call vma_replace_policy() which frees the old mempolicy immediately via kmem_cache_free(). This creates a race where __futex_key_to_node() dereferences a freed mempolicy pointer, causing a use-after-free read of mpol->mode. [ 151.412631] BUG: KASAN: slab-use-after-free in __futex_key_to_node (kernel/futex/core.c:349) [ 151.414046] Read of size 2 at addr ffff888001c49634 by task e/87 [ 151.415969] Call Trace: [ 151.416732] __asan_load2 (mm/kasan/generic.c:271) [ 151.416777] __futex_key_to_node (kernel/futex/core.c:349) [ 151.41
No detection rules found.
No public exploits indexed.
Wiz
CVE-2026-23415 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz
CVE-2026-23415 CVE-2026-23415 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-23415 :
Linux Kernel vulnerability analysis and mitigation
In the Linux kernel, the following vulnerability has been resolved:
futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
During futex_key_to_node_opt() execution, vma->vm_policy is read under
speculative mmap lock and RCU. Concurrently, mbind() may call
vma_replace_policy() which frees the old mempolicy immediately via
kmem_cache_free().
This creates a race where __futex_key_to_node() dereferences a freed
mempolicy pointer, causing a use-after-free read of mpol->mode.
[ 151.412631] BUG: KASAN: slab-use-after-free in __futex_key_to_node (kernel/futex/core.c:349)
[ 151.414046] Read of size 2 at addr ffff888001c49634 by task e/87
[ 151.415969] Call Trace:
[ 151.416732] __asan_load2 (mm/kasan/gene
Bugzilla
CVE-2026-23415 kernel: futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
bugzilla·2026-04-02·CVSS 7.8
CVE-2026-23415 [HIGH] CVE-2026-23415 kernel: futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
CVE-2026-23415 kernel: futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
In the Linux kernel, the following vulnerability has been resolved:
futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()
During futex_key_to_node_opt() execution, vma->vm_policy is read under
speculative mmap lock and RCU. Concurrently, mbind() may call
vma_replace_policy() which frees the old mempolicy immediately via
kmem_cache_free().
This creates a race where __futex_key_to_node() dereferences a freed
mempolicy pointer, causing a use-after-free read of mpol->mode.
[ 151.412631] BUG: KASAN: slab-use-after-free in __futex_key_to_node (kernel/futex/core.c:349)
[ 151.414046] Read of size 2 at addr ffff888001c49634 by task e/87
[ 151.415969] Call Trace:
[ 151.416732] __as
2026-04-02
Published