CVE-2022-49567 (GCVE-0-2022-49567)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:23 – Updated: 2025-12-23 13:24
VLAI?
Title
mm/mempolicy: fix uninit-value in mpol_rebind_policy()
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/mempolicy: fix uninit-value in mpol_rebind_policy() mpol_set_nodemask()(mm/mempolicy.c) does not set up nodemask when pol->mode is MPOL_LOCAL. Check pol->mode before access pol->w.cpuset_mems_allowed in mpol_rebind_policy()(mm/mempolicy.c). BUG: KMSAN: uninit-value in mpol_rebind_policy mm/mempolicy.c:352 [inline] BUG: KMSAN: uninit-value in mpol_rebind_task+0x2ac/0x2c0 mm/mempolicy.c:368 mpol_rebind_policy mm/mempolicy.c:352 [inline] mpol_rebind_task+0x2ac/0x2c0 mm/mempolicy.c:368 cpuset_change_task_nodemask kernel/cgroup/cpuset.c:1711 [inline] cpuset_attach+0x787/0x15e0 kernel/cgroup/cpuset.c:2278 cgroup_migrate_execute+0x1023/0x1d20 kernel/cgroup/cgroup.c:2515 cgroup_migrate kernel/cgroup/cgroup.c:2771 [inline] cgroup_attach_task+0x540/0x8b0 kernel/cgroup/cgroup.c:2804 __cgroup1_procs_write+0x5cc/0x7a0 kernel/cgroup/cgroup-v1.c:520 cgroup1_tasks_write+0x94/0xb0 kernel/cgroup/cgroup-v1.c:539 cgroup_file_write+0x4c2/0x9e0 kernel/cgroup/cgroup.c:3852 kernfs_fop_write_iter+0x66a/0x9f0 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2162 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0x1318/0x2030 fs/read_write.c:590 ksys_write+0x28b/0x510 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0xdb/0x120 fs/read_write.c:652 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae Uninit was created at: slab_post_alloc_hook mm/slab.h:524 [inline] slab_alloc_node mm/slub.c:3251 [inline] slab_alloc mm/slub.c:3259 [inline] kmem_cache_alloc+0x902/0x11c0 mm/slub.c:3264 mpol_new mm/mempolicy.c:293 [inline] do_set_mempolicy+0x421/0xb70 mm/mempolicy.c:853 kernel_set_mempolicy mm/mempolicy.c:1504 [inline] __do_sys_set_mempolicy mm/mempolicy.c:1510 [inline] __se_sys_set_mempolicy+0x44c/0xb60 mm/mempolicy.c:1507 __x64_sys_set_mempolicy+0xd8/0x110 mm/mempolicy.c:1507 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae KMSAN: uninit-value in mpol_rebind_task (2) https://syzkaller.appspot.com/bug?id=d6eb90f952c2a5de9ea718a1b873c55cb13b59dc This patch seems to fix below bug too. KMSAN: uninit-value in mpol_rebind_mm (2) https://syzkaller.appspot.com/bug?id=f2fecd0d7013f54ec4162f60743a2b28df40926b The uninit-value is pol->w.cpuset_mems_allowed in mpol_rebind_policy(). When syzkaller reproducer runs to the beginning of mpol_new(), mpol_new() mm/mempolicy.c do_mbind() mm/mempolicy.c kernel_mbind() mm/mempolicy.c `mode` is 1(MPOL_PREFERRED), nodes_empty(*nodes) is `true` and `flags` is 0. Then mode = MPOL_LOCAL; ... policy->mode = mode; policy->flags = flags; will be executed. So in mpol_set_nodemask(), mpol_set_nodemask() mm/mempolicy.c do_mbind() kernel_mbind() pol->mode is 4 (MPOL_LOCAL), that `nodemask` in `pol` is not initialized, which will be accessed in mpol_rebind_policy().
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-908 - Use of Uninitialized Resource
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7858d7bca7fbbbbd5b940d2ec371b2d060b21b84 , < 8c5429a04ccd8dbcc3c753dab2f4126774ec28d4 (git)
Affected: 7858d7bca7fbbbbd5b940d2ec371b2d060b21b84 , < 777e563f10e91e91130fe06bee85220d508e7b9b (git)
Affected: 7858d7bca7fbbbbd5b940d2ec371b2d060b21b84 , < 018160ad314d75b1409129b2247b614a9f35894c (git)
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    Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.15.58 , ≤ 5.15.* (semver)
Unaffected: 5.18.15 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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\"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5735845906fb1d90fe597f8b503fc0a857d475e3\"}, {\"url\": \"https://git.kernel.org/stable/c/aaa1c5d635a6fca2043513ffb5be169f9cd17d9e\"}, {\"url\": \"https://git.kernel.org/stable/c/13d51565cec1aa432a6ab363edc2bbc53c6f49cb\"}, {\"url\": \"https://git.kernel.org/stable/c/a1f8765f68bc9bf5744b365bb9f5e0b6db93edfe\"}, {\"url\": \"https://git.kernel.org/stable/c/ddb3f0b68863bd1c5f43177eea476bce316d4993\"}, {\"url\": \"https://git.kernel.org/stable/c/8c5429a04ccd8dbcc3c753dab2f4126774ec28d4\"}, {\"url\": \"https://git.kernel.org/stable/c/777e563f10e91e91130fe06bee85220d508e7b9b\"}, {\"url\": \"https://git.kernel.org/stable/c/018160ad314d75b1409129b2247b614a9f35894c\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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-\u003emode is MPOL_LOCAL.  Check pol-\u003emode before access\\npol-\u003ew.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-\u003ew.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-\u003emode = mode;\\n\\tpolicy-\u003eflags = 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-\u003emode is 4 (MPOL_LOCAL), that `nodemask` in `pol` is not initialized,\\nwhich will be accessed in mpol_rebind_policy().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.325\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.290\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.254\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.208\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.134\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.58\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T08:40:47.929Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49567\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-01T19:46:37.965Z\", \"dateReserved\": \"2025-02-26T02:21:30.410Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T02:23:12.222Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Detection rules are retrieved from Rulezet.