CVE-2024-40947 (GCVE-0-2024-40947)

Vulnerability from cvelistv5 – Published: 2024-07-12 12:31 – Updated: 2025-11-03 21:58
VLAI?
Title
ima: Avoid blocking in RCU read-side critical section
Summary
In the Linux kernel, the following vulnerability has been resolved: ima: Avoid blocking in RCU read-side critical section A panic happens in ima_match_policy: BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 PGD 42f873067 P4D 0 Oops: 0000 [#1] SMP NOPTI CPU: 5 PID: 1286325 Comm: kubeletmonit.sh Kdump: loaded Tainted: P Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015 RIP: 0010:ima_match_policy+0x84/0x450 Code: 49 89 fc 41 89 cf 31 ed 89 44 24 14 eb 1c 44 39 7b 18 74 26 41 83 ff 05 74 20 48 8b 1b 48 3b 1d f2 b9 f4 00 0f 84 9c 01 00 00 <44> 85 73 10 74 ea 44 8b 6b 14 41 f6 c5 01 75 d4 41 f6 c5 02 74 0f RSP: 0018:ff71570009e07a80 EFLAGS: 00010207 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000200 RDX: ffffffffad8dc7c0 RSI: 0000000024924925 RDI: ff3e27850dea2000 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffabfce739 R10: ff3e27810cc42400 R11: 0000000000000000 R12: ff3e2781825ef970 R13: 00000000ff3e2785 R14: 000000000000000c R15: 0000000000000001 FS: 00007f5195b51740(0000) GS:ff3e278b12d40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000010 CR3: 0000000626d24002 CR4: 0000000000361ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ima_get_action+0x22/0x30 process_measurement+0xb0/0x830 ? page_add_file_rmap+0x15/0x170 ? alloc_set_pte+0x269/0x4c0 ? prep_new_page+0x81/0x140 ? simple_xattr_get+0x75/0xa0 ? selinux_file_open+0x9d/0xf0 ima_file_check+0x64/0x90 path_openat+0x571/0x1720 do_filp_open+0x9b/0x110 ? page_counter_try_charge+0x57/0xc0 ? files_cgroup_alloc_fd+0x38/0x60 ? __alloc_fd+0xd4/0x250 ? do_sys_open+0x1bd/0x250 do_sys_open+0x1bd/0x250 do_syscall_64+0x5d/0x1d0 entry_SYSCALL_64_after_hwframe+0x65/0xca Commit c7423dbdbc9e ("ima: Handle -ESTALE returned by ima_filter_rule_match()") introduced call to ima_lsm_copy_rule within a RCU read-side critical section which contains kmalloc with GFP_KERNEL. This implies a possible sleep and violates limitations of RCU read-side critical sections on non-PREEMPT systems. Sleeping within RCU read-side critical section might cause synchronize_rcu() returning early and break RCU protection, allowing a UAF to happen. The root cause of this issue could be described as follows: | Thread A | Thread B | | |ima_match_policy | | | rcu_read_lock | |ima_lsm_update_rule | | | synchronize_rcu | | | | kmalloc(GFP_KERNEL)| | | sleep | ==> synchronize_rcu returns early | kfree(entry) | | | | entry = entry->next| ==> UAF happens and entry now becomes NULL (or could be anything). | | entry->action | ==> Accessing entry might cause panic. To fix this issue, we are converting all kmalloc that is called within RCU read-side critical section to use GFP_ATOMIC. [PM: fixed missing comment, long lines, !CONFIG_IMA_LSM_RULES case]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c4b035b1f036ddd53fbfced49046e586c5ad8a3e , < a6176a802c4bfb83bf7524591aa75f44a639a853 (git)
Affected: 2d4bc60693c4206c64723e94ae5f7a04c0b8f18f , < a38e02265c681b51997a264aaf743095e2ee400a (git)
Affected: 8008f1691c15f353f5a53dc5d450b8262cb57421 , < 9c3906c3738562b1fedc6f1cfc81756a7cfefff0 (git)
Affected: c7423dbdbc9ecef7fff5239d144cad4b9887f4de , < 28d0ecc52f6c927d0e9ba70a4f2c1ea15453ee88 (git)
Affected: c7423dbdbc9ecef7fff5239d144cad4b9887f4de , < 58275455893066149e9f4df2223ab2fdbdc59f9c (git)
Affected: c7423dbdbc9ecef7fff5239d144cad4b9887f4de , < 9a95c5bfbf02a0a7f5983280fe284a0ff0836c34 (git)
Affected: 38d48fd224036717fcb3437e7af1314f6ebcd2d0 (git)
Affected: 69c60b2a2dbb4887739d3a13297cc0dae3793f35 (git)
Create a notification for this product.
    Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 5.10.222 , ≤ 5.10.* (semver)
Unaffected: 5.15.163 , ≤ 5.15.* (semver)
Unaffected: 6.1.98 , ≤ 6.1.* (semver)
Unaffected: 6.6.39 , ≤ 6.6.* (semver)
Unaffected: 6.9.7 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-40947\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T17:04:11.306292Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:22.527Z\"}}], \"cna\": {\"title\": \"ima: Avoid blocking in RCU read-side critical section\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"c4b035b1f036ddd53fbfced49046e586c5ad8a3e\", \"lessThan\": \"a6176a802c4bfb83bf7524591aa75f44a639a853\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2d4bc60693c4206c64723e94ae5f7a04c0b8f18f\", \"lessThan\": \"a38e02265c681b51997a264aaf743095e2ee400a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8008f1691c15f353f5a53dc5d450b8262cb57421\", \"lessThan\": \"9c3906c3738562b1fedc6f1cfc81756a7cfefff0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c7423dbdbc9ecef7fff5239d144cad4b9887f4de\", \"lessThan\": \"28d0ecc52f6c927d0e9ba70a4f2c1ea15453ee88\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c7423dbdbc9ecef7fff5239d144cad4b9887f4de\", \"lessThan\": \"58275455893066149e9f4df2223ab2fdbdc59f9c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"c7423dbdbc9ecef7fff5239d144cad4b9887f4de\", \"lessThan\": \"9a95c5bfbf02a0a7f5983280fe284a0ff0836c34\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"38d48fd224036717fcb3437e7af1314f6ebcd2d0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"69c60b2a2dbb4887739d3a13297cc0dae3793f35\", \"versionType\": \"git\"}], \"programFiles\": [\"include/linux/lsm_hook_defs.h\", \"include/linux/security.h\", \"kernel/auditfilter.c\", \"security/apparmor/audit.c\", \"security/apparmor/include/audit.h\", \"security/integrity/ima/ima.h\", \"security/integrity/ima/ima_policy.c\", \"security/security.c\", \"security/selinux/include/audit.h\", \"security/selinux/ss/services.c\", \"security/smack/smack_lsm.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.2\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.222\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.163\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.98\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.39\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/linux/lsm_hook_defs.h\", \"include/linux/security.h\", \"kernel/auditfilter.c\", \"security/apparmor/audit.c\", \"security/apparmor/include/audit.h\", \"security/integrity/ima/ima.h\", \"security/integrity/ima/ima_policy.c\", \"security/security.c\", \"security/selinux/include/audit.h\", \"security/selinux/ss/services.c\", \"security/smack/smack_lsm.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a6176a802c4bfb83bf7524591aa75f44a639a853\"}, {\"url\": \"https://git.kernel.org/stable/c/a38e02265c681b51997a264aaf743095e2ee400a\"}, {\"url\": \"https://git.kernel.org/stable/c/9c3906c3738562b1fedc6f1cfc81756a7cfefff0\"}, {\"url\": \"https://git.kernel.org/stable/c/28d0ecc52f6c927d0e9ba70a4f2c1ea15453ee88\"}, {\"url\": \"https://git.kernel.org/stable/c/58275455893066149e9f4df2223ab2fdbdc59f9c\"}, {\"url\": \"https://git.kernel.org/stable/c/9a95c5bfbf02a0a7f5983280fe284a0ff0836c34\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nima: Avoid blocking in RCU read-side critical section\\n\\nA panic happens in ima_match_policy:\\n\\nBUG: unable to handle kernel NULL pointer dereference at 0000000000000010\\nPGD 42f873067 P4D 0\\nOops: 0000 [#1] SMP NOPTI\\nCPU: 5 PID: 1286325 Comm: kubeletmonit.sh\\nKdump: loaded Tainted: P\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996),\\n               BIOS 0.0.0 02/06/2015\\nRIP: 0010:ima_match_policy+0x84/0x450\\nCode: 49 89 fc 41 89 cf 31 ed 89 44 24 14 eb 1c 44 39\\n      7b 18 74 26 41 83 ff 05 74 20 48 8b 1b 48 3b 1d\\n      f2 b9 f4 00 0f 84 9c 01 00 00 \u003c44\u003e 85 73 10 74 ea\\n      44 8b 6b 14 41 f6 c5 01 75 d4 41 f6 c5 02 74 0f\\nRSP: 0018:ff71570009e07a80 EFLAGS: 00010207\\nRAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000200\\nRDX: ffffffffad8dc7c0 RSI: 0000000024924925 RDI: ff3e27850dea2000\\nRBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffabfce739\\nR10: ff3e27810cc42400 R11: 0000000000000000 R12: ff3e2781825ef970\\nR13: 00000000ff3e2785 R14: 000000000000000c R15: 0000000000000001\\nFS:  00007f5195b51740(0000)\\nGS:ff3e278b12d40000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 0000000000000010 CR3: 0000000626d24002 CR4: 0000000000361ee0\\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\nCall Trace:\\n ima_get_action+0x22/0x30\\n process_measurement+0xb0/0x830\\n ? page_add_file_rmap+0x15/0x170\\n ? alloc_set_pte+0x269/0x4c0\\n ? prep_new_page+0x81/0x140\\n ? simple_xattr_get+0x75/0xa0\\n ? selinux_file_open+0x9d/0xf0\\n ima_file_check+0x64/0x90\\n path_openat+0x571/0x1720\\n do_filp_open+0x9b/0x110\\n ? page_counter_try_charge+0x57/0xc0\\n ? files_cgroup_alloc_fd+0x38/0x60\\n ? __alloc_fd+0xd4/0x250\\n ? do_sys_open+0x1bd/0x250\\n do_sys_open+0x1bd/0x250\\n do_syscall_64+0x5d/0x1d0\\n entry_SYSCALL_64_after_hwframe+0x65/0xca\\n\\nCommit c7423dbdbc9e (\\\"ima: Handle -ESTALE returned by\\nima_filter_rule_match()\\\") introduced call to ima_lsm_copy_rule within a\\nRCU read-side critical section which contains kmalloc with GFP_KERNEL.\\nThis implies a possible sleep and violates limitations of RCU read-side\\ncritical sections on non-PREEMPT systems.\\n\\nSleeping within RCU read-side critical section might cause\\nsynchronize_rcu() returning early and break RCU protection, allowing a\\nUAF to happen.\\n\\nThe root cause of this issue could be described as follows:\\n|\\tThread A\\t|\\tThread B\\t|\\n|\\t\\t\\t|ima_match_policy\\t|\\n|\\t\\t\\t|  rcu_read_lock\\t|\\n|ima_lsm_update_rule\\t|\\t\\t\\t|\\n|  synchronize_rcu\\t|\\t\\t\\t|\\n|\\t\\t\\t|    kmalloc(GFP_KERNEL)|\\n|\\t\\t\\t|      sleep\\t\\t|\\n==\u003e synchronize_rcu returns early\\n|  kfree(entry)\\t\\t|\\t\\t\\t|\\n|\\t\\t\\t|    entry = entry-\u003enext|\\n==\u003e UAF happens and entry now becomes NULL (or could be anything).\\n|\\t\\t\\t|    entry-\u003eaction\\t|\\n==\u003e Accessing entry might cause panic.\\n\\nTo fix this issue, we are converting all kmalloc that is called within\\nRCU read-side critical section to use GFP_ATOMIC.\\n\\n[PM: fixed missing comment, long lines, !CONFIG_IMA_LSM_RULES case]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.222\", \"versionStartIncluding\": \"5.10.163\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.163\", \"versionStartIncluding\": \"5.15.86\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.98\", \"versionStartIncluding\": \"6.1.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.39\", \"versionStartIncluding\": \"6.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9.7\", \"versionStartIncluding\": \"6.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10\", \"versionStartIncluding\": \"6.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.229\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.0.16\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:57:18.821Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-40947\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T12:57:18.821Z\", \"dateReserved\": \"2024-07-12T12:17:45.589Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-12T12:31:52.810Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.