{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-40947","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-07-12T12:17:45.589Z","datePublished":"2024-07-12T12:31:52.810Z","dateUpdated":"2025-11-03T21:58:14.185Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T12:57:18.821Z"},"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 <44> 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==> synchronize_rcu returns early\n|  kfree(entry)\t\t|\t\t\t|\n|\t\t\t|    entry = entry->next|\n==> UAF happens and entry now becomes NULL (or could be anything).\n|\t\t\t|    entry->action\t|\n==> 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]"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.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"],"versions":[{"version":"c4b035b1f036ddd53fbfced49046e586c5ad8a3e","lessThan":"a6176a802c4bfb83bf7524591aa75f44a639a853","status":"affected","versionType":"git"},{"version":"2d4bc60693c4206c64723e94ae5f7a04c0b8f18f","lessThan":"a38e02265c681b51997a264aaf743095e2ee400a","status":"affected","versionType":"git"},{"version":"8008f1691c15f353f5a53dc5d450b8262cb57421","lessThan":"9c3906c3738562b1fedc6f1cfc81756a7cfefff0","status":"affected","versionType":"git"},{"version":"c7423dbdbc9ecef7fff5239d144cad4b9887f4de","lessThan":"28d0ecc52f6c927d0e9ba70a4f2c1ea15453ee88","status":"affected","versionType":"git"},{"version":"c7423dbdbc9ecef7fff5239d144cad4b9887f4de","lessThan":"58275455893066149e9f4df2223ab2fdbdc59f9c","status":"affected","versionType":"git"},{"version":"c7423dbdbc9ecef7fff5239d144cad4b9887f4de","lessThan":"9a95c5bfbf02a0a7f5983280fe284a0ff0836c34","status":"affected","versionType":"git"},{"version":"38d48fd224036717fcb3437e7af1314f6ebcd2d0","status":"affected","versionType":"git"},{"version":"69c60b2a2dbb4887739d3a13297cc0dae3793f35","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.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"],"versions":[{"version":"6.2","status":"affected"},{"version":"0","lessThan":"6.2","status":"unaffected","versionType":"semver"},{"version":"5.10.222","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.163","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.98","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.39","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.9.7","lessThanOrEqual":"6.9.*","status":"unaffected","versionType":"semver"},{"version":"6.10","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.163","versionEndExcluding":"5.10.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.86","versionEndExcluding":"5.15.163"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.2","versionEndExcluding":"6.1.98"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.9.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.229"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0.16"}]}]}],"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"}],"title":"ima: Avoid blocking in RCU read-side critical section","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/a6176a802c4bfb83bf7524591aa75f44a639a853","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/a38e02265c681b51997a264aaf743095e2ee400a","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/9c3906c3738562b1fedc6f1cfc81756a7cfefff0","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/28d0ecc52f6c927d0e9ba70a4f2c1ea15453ee88","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/58275455893066149e9f4df2223ab2fdbdc59f9c","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/9a95c5bfbf02a0a7f5983280fe284a0ff0836c34","tags":["x_transferred"]},{"url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T21:58:14.185Z"}},{"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"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-11T17:34:25.214Z"}}]}}