CVE-2026-23183: In the Linux kernel, the following vulnerability has been resolved: cgroup/dmem: fix NULL pointer dereference when setting max An issue was triggered: BUG…

PriorityP421medium4.4

EPSS

0.15%

5.2th percentile

In the Linux kernel, the following vulnerability has been resolved: cgroup/dmem: fix NULL pointer dereference when setting max An issue was triggered: BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP NOPTI CPU: 15 UID: 0 PID: 658 Comm: bash Tainted: 6.19.0-rc6-next-2026012 Tainted: [O]=OOT_MODULE Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), RIP: 0010:strcmp+0x10/0x30 RSP: 0018:ffffc900017f7dc0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888107cd4358 RDX: 0000000019f73907 RSI: ffffffff82cc381a RDI: 0000000000000000 RBP: ffff8881016bef0d R08: 000000006c0e7145 R09: 0000000056c0e714 R10: 0000000000000001 R11: ffff888107cd4358 R12: 0007ffffffffffff R13: ffff888101399200 R14: ffff888100fcb360 R15: 0007ffffffffffff CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000105c79000 CR4: 00000000000006f0 Call Trace: dmemcg_limit_write.constprop.0+0x16d/0x390 ? __pfx_set_resource_max+0x10/0x10 kernfs_fop_write_iter+0x14e/0x200 vfs_write+0x367/0x510 ksys_write+0x66/0xe0 do_syscall_64+0x6b/0x390 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f42697e1887 It was trriggered setting max without limitation, the command is like: "echo test/region0 > dmem.max". To fix this issue, add check whether options is valid after parsing the region_name.

Affected

6 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.18.10-1 (forky)	linux 6.18.10-1 (forky)
linux	linux	—	—
linux	linux	>= b168ed458ddecc176f3b9a1f4bcd83d7a4541c14 < c13816e8fa23deec6a8d7465d9e637fd02683b5c	c13816e8fa23deec6a8d7465d9e637fd02683b5c
linux	linux	>= b168ed458ddecc176f3b9a1f4bcd83d7a4541c14 < 43151f812886be1855d2cba059f9c93e4729460b	43151f812886be1855d2cba059f9c93e4729460b
linux	linux_kernel	>= 0 < 6.18.10-1	6.18.10-1
linux	linux_kernel	>= 6.14.0 < 6.18.10	6.18.10

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.