> CVE-2026-31654

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PUBLISHED
2026-04-24 15:16
MODIFIED
2026-04-24 15:16
EPSS (Prob. Exploit)
0.11%
Top 98.6%
DATA SOURCES:
NVD 🔗 2026-04-24 RED HAT 🔗 2026-04-26 FIRST EPSS 🔗 2026-11-08 OSV 🔗 2026-11-02

> DESCRIPTION

In the Linux kernel, the following vulnerability has been resolved: mm/vma: fix memory leak in __mmap_region() commit 605f6586ecf7 ("mm/vma: do not leak memory when .mmap_prepare swaps the file") handled the success path by skipping get_file() via file_doesnt_need_get, but missed the error path. When /dev/zero is mmap'd with MAP_SHARED, mmap_zero_prepare() calls shmem_zero_setup_desc() which allocates a new shmem file to back the mapping. If __mmap_new_vma() subsequently fails, this replacement file is never fput()'d - the original is released by ksys_mmap_pgoff(), but nobody releases the new one. Add fput() for the swapped file in the error path. Reproducible with fault injection. FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 2 UID: 0 PID: 366 Comm: syz.7.14 Not tainted 7.0.0-rc6 #2 PREEMPT(full) Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x164/0x1f0 should_fail_ex+0x525/0x650 should_failslab+0xdf/0x140 kmem_cache_alloc_noprof+0x78/0x630 vm_area_alloc+0x24/0x160 __mmap_region+0xf6b/0x2660 mmap_region+0x2eb/0x3a0 do_mmap+0xc79/0x1240 vm_mmap_pgoff+0x252/0x4c0 ksys_mmap_pgoff+0xf8/0x120 __x64_sys_mmap+0x12a/0x190 do_syscall_64+0xa9/0x580 entry_SYSCALL_64_after_hwframe+0x76/0x7e </TASK> kmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak) BUG: memory leak unreferenced object 0xffff8881118aca80 (size 360): comm "syz.7.14", pid 366, jiffies 4294913255 hex dump (first 32 bytes): 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N.......... ff ff ff ff ff ff ff ff c0 28 4d ae ff ff ff ff .........(M..... backtrace (crc db0f53bc): kmem_cache_alloc_noprof+0x3ab/0x630 alloc_empty_file+0x5a/0x1e0 alloc_file_pseudo+0x135/0x220 __shmem_file_setup+0x274/0x420 shmem_zero_setup_desc+0x9c/0x170 mmap_zero_prepare+0x123/0x140 __mmap_region+0xdda/0x2660 mmap_region+0x2eb/0x3a0 do_mmap+0xc79/0x1240 vm_mmap_pgoff+0x252/0x4c0 ksys_mmap_pgoff+0xf8/0x120 __x64_sys_mmap+0x12a/0x190 do_syscall_64+0xa9/0x580 entry_SYSCALL_64_after_hwframe+0x76/0x7e Found by syzkaller.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> RED HAT SEVERITY ASSESSMENT

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

mm/vma: fix memory leak in __mmap_region()

AFFECTED PACKAGES:
Unknown / Unknown
Linux / Kernel

> HISTORIQUE DES MODIFICATIONS

Première apparition
24/04/2026 15:16
Source: NVD
📊 ENRICHISSEMENT 26/04/2026 05:01
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 23:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 22:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 21:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 20:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 19:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 18:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 17:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 16:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 15:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 14:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 13:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 12:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 11:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 10:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 09:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 08:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 07:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 06:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 05:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 04:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 03:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 02:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 01:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
{ "severity_scale": null, "threat_severity": null }
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 00:30
REDHAT
Champ modifié: Sévérité Red Hat
Ancienne valeur:
N/A
Nouvelle valeur:
{ "threat_severity": null, "severity_scale": null }
📊 ENRICHISSEMENT 25/04/2026 00:30
REDHAT
Champ modifié: Red Hat
Ancienne valeur:
Non
Nouvelle valeur:
Oui
Total des modifications: 26 Dernière mise à jour: 6 months ago

> REFERENCES

https://git.kernel.org/stable/c/61fc8eaf2ab214b32c7bce52597c80cf0ca41ada
https://git.kernel.org/stable/c/894f99eb535edc4514f756818f3c4f688ba53a59
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