{"id":"CVE-2026-23183","state":"PUBLISHED","title":"cgroup/dmem: fix NULL pointer dereference when setting max","description":"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  <TASK>\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 > dmem.max\". To fix this issue, add check whether\noptions is valid after parsing the region_name.","publishedAt":"2026-02-14T16:27:13.482Z","updatedAt":"2026-05-11T22:01:55.689Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b168ed458ddecc176f3b9a1f4bcd83d7a4541c14","status":"affected","lessThan":"c13816e8fa23deec6a8d7465d9e637fd02683b5c","versionType":"git"},{"version":"b168ed458ddecc176f3b9a1f4bcd83d7a4541c14","status":"affected","lessThan":"43151f812886be1855d2cba059f9c93e4729460b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cgroup/dmem.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.14","versionType":"semver"},{"version":"6.18.10","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cgroup/dmem.c"]}],"references":["https://git.kernel.org/stable/c/c13816e8fa23deec6a8d7465d9e637fd02683b5c","https://git.kernel.org/stable/c/43151f812886be1855d2cba059f9c93e4729460b"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23183.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23183","state":"PUBLISHED","datePublished":"2026-02-14T16:27:13.482Z","dateUpdated":"2026-05-11T22:01:55.689Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.984Z"},"containers":{"cna":{"title":"cgroup/dmem: fix NULL pointer dereference when setting max","descriptions":[{"lang":"en","value":"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  <TASK>\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 > dmem.max\". To fix this issue, add check whether\noptions is valid after parsing the region_name."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b168ed458ddecc176f3b9a1f4bcd83d7a4541c14","status":"affected","lessThan":"c13816e8fa23deec6a8d7465d9e637fd02683b5c","versionType":"git"},{"version":"b168ed458ddecc176f3b9a1f4bcd83d7a4541c14","status":"affected","lessThan":"43151f812886be1855d2cba059f9c93e4729460b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cgroup/dmem.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.14","versionType":"semver"},{"version":"6.18.10","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/cgroup/dmem.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/c13816e8fa23deec6a8d7465d9e637fd02683b5c"},{"url":"https://git.kernel.org/stable/c/43151f812886be1855d2cba059f9c93e4729460b"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:01:55.689Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.18.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}