{"id":"CVE-2026-23183","summary":"cgroup/dmem: fix NULL pointer dereference when setting max","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncgroup/dmem: fix NULL pointer dereference when setting max\n\nAn issue was triggered:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: Oops: 0000 [#1] SMP NOPTI\n CPU: 15 UID: 0 PID: 658 Comm: bash Tainted: 6.19.0-rc6-next-2026012\n Tainted: [O]=OOT_MODULE\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),\n RIP: 0010:strcmp+0x10/0x30\n RSP: 0018:ffffc900017f7dc0 EFLAGS: 00000246\n RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888107cd4358\n RDX: 0000000019f73907 RSI: ffffffff82cc381a RDI: 0000000000000000\n RBP: ffff8881016bef0d R08: 000000006c0e7145 R09: 0000000056c0e714\n R10: 0000000000000001 R11: ffff888107cd4358 R12: 0007ffffffffffff\n R13: ffff888101399200 R14: ffff888100fcb360 R15: 0007ffffffffffff\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000000 CR3: 0000000105c79000 CR4: 00000000000006f0\n Call Trace:\n  \u003cTASK\u003e\n  dmemcg_limit_write.constprop.0+0x16d/0x390\n  ? __pfx_set_resource_max+0x10/0x10\n  kernfs_fop_write_iter+0x14e/0x200\n  vfs_write+0x367/0x510\n  ksys_write+0x66/0xe0\n  do_syscall_64+0x6b/0x390\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n RIP: 0033:0x7f42697e1887\n\nIt was trriggered setting max without limitation, the command is like:\n\"echo test/region0 \u003e dmem.max\". To fix this issue, add check whether\noptions is valid after parsing the region_name.","modified":"2026-08-12T03:51:13.942753636Z","published":"2026-02-14T16:27:13.482Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23183.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/43151f812886be1855d2cba059f9c93e4729460b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c13816e8fa23deec6a8d7465d9e637fd02683b5c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23183.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23183"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b168ed458ddecc176f3b9a1f4bcd83d7a4541c14"},{"fixed":"c13816e8fa23deec6a8d7465d9e637fd02683b5c"},{"fixed":"43151f812886be1855d2cba059f9c93e4729460b"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23183.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.14.0"},{"fixed":"6.18.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23183.json"}}],"schema_version":"1.9.0"}