{"cve":"CVE-2022-49567","nvd":{"published":"2025-02-26T07:01:32.420","modified":"2026-06-17T05:18:28.290","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mempolicy: fix uninit-value in mpol_rebind_policy()\n\nmpol_set_nodemask()(mm/mempolicy.c) does not set up nodemask when\npol->mode is MPOL_LOCAL.  Check pol->mode before access\npol->w.cpuset_mems_allowed in mpol_rebind_policy()(mm/mempolicy.c).\n\nBUG: KMSAN: uninit-value in mpol_rebind_policy mm/mempolicy.c:352 [inline]\nBUG: KMSAN: uninit-value in mpol_rebind_task+0x2ac/0x2c0 mm/mempolicy.c:368\n mpol_rebind_policy mm/mempolicy.c:352 [inline]\n mpol_rebind_task+0x2ac/0x2c0 mm/mempolicy.c:368\n cpuset_change_task_nodemask kernel/cgroup/cpuset.c:1711 [inline]\n cpuset_attach+0x787/0x15e0 kernel/cgroup/cpuset.c:2278\n cgroup_migrate_execute+0x1023/0x1d20 kernel/cgroup/cgroup.c:2515\n cgroup_migrate kernel/cgroup/cgroup.c:2771 [inline]\n cgroup_attach_task+0x540/0x8b0 kernel/cgroup/cgroup.c:2804\n __cgroup1_procs_write+0x5cc/0x7a0 kernel/cgroup/cgroup-v1.c:520\n cgroup1_tasks_write+0x94/0xb0 kernel/cgroup/cgroup-v1.c:539\n cgroup_file_write+0x4c2/0x9e0 kernel/cgroup/cgroup.c:3852\n kernfs_fop_write_iter+0x66a/0x9f0 fs/kernfs/file.c:296\n call_write_iter include/linux/fs.h:2162 [inline]\n new_sync_write fs/read_write.c:503 [inline]\n vfs_write+0x1318/0x2030 fs/read_write.c:590\n ksys_write+0x28b/0x510 fs/read_write.c:643\n __do_sys_write fs/read_write.c:655 [inline]\n __se_sys_write fs/read_write.c:652 [inline]\n __x64_sys_write+0xdb/0x120 fs/read_write.c:652\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nUninit was created at:\n slab_post_alloc_hook mm/slab.h:524 [inline]\n slab_alloc_node mm/slub.c:3251 [inline]\n slab_alloc mm/slub.c:3259 [inline]\n kmem_cache_alloc+0x902/0x11c0 mm/slub.c:3264\n mpol_new mm/mempolicy.c:293 [inline]\n do_set_mempolicy+0x421/0xb70 mm/mempolicy.c:853\n kernel_set_mempolicy mm/mempolicy.c:1504 [inline]\n __do_sys_set_mempolicy mm/mempolicy.c:1510 [inline]\n __se_sys_set_mempolicy+0x44c/0xb60 mm/mempolicy.c:1507\n __x64_sys_set_mempolicy+0xd8/0x110 mm/mempolicy.c:1507\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nKMSAN: uninit-value in mpol_rebind_task (2)\nhttps://syzkaller.appspot.com/bug?id=d6eb90f952c2a5de9ea718a1b873c55cb13b59dc\n\nThis patch seems to fix below bug too.\nKMSAN: uninit-value in mpol_rebind_mm (2)\nhttps://syzkaller.appspot.com/bug?id=f2fecd0d7013f54ec4162f60743a2b28df40926b\n\nThe uninit-value is pol->w.cpuset_mems_allowed in mpol_rebind_policy().\nWhen syzkaller reproducer runs to the beginning of mpol_new(),\n\n\t    mpol_new() mm/mempolicy.c\n\t  do_mbind() mm/mempolicy.c\n\tkernel_mbind() mm/mempolicy.c\n\n`mode` is 1(MPOL_PREFERRED), nodes_empty(*nodes) is `true` and `flags`\nis 0. Then\n\n\tmode = MPOL_LOCAL;\n\t...\n\tpolicy->mode = mode;\n\tpolicy->flags = flags;\n\nwill be executed. So in mpol_set_nodemask(),\n\n\t    mpol_set_nodemask() mm/mempolicy.c\n\t  do_mbind()\n\tkernel_mbind()\n\npol->mode is 4 (MPOL_LOCAL), that `nodemask` in `pol` is not initialized,\nwhich will be accessed in mpol_rebind_policy().","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-908"],"references":["https://git.kernel.org/stable/c/018160ad314d75b1409129b2247b614a9f35894c","https://git.kernel.org/stable/c/777e563f10e91e91130fe06bee85220d508e7b9b","https://git.kernel.org/stable/c/8c5429a04ccd8dbcc3c753dab2f4126774ec28d4"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:59:48.811064707+00:00"},"epss":{"cve":"CVE-2022-49567","score":0.00277,"percentile":0.20134,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}