375 lines
22 KiB
JSON
375 lines
22 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-40947",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-07-12T12:17:45.589Z",
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"datePublished": "2024-07-12T12:31:52.810Z",
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"dateUpdated": "2026-08-05T11:34:10.711Z"
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},
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"containers": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:34:10.711Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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]"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable RCU read-side section is entered from `ima_file_check()`/`process_measurement()` on the `open()`/`execve()` path, so the attacker must be executing code locally on the host. There is no network protocol handler that reaches `ima_match_policy()` directly.\nAC:L - The attacker fully controls the reader side (an `open()` storm across all CPUs), the memory pressure that forces the `GFP_KERNEL` allocation into reclaim and schedules away, and the parallelism — no specific memory layout or timing the attacker cannot influence is needed, and `ima_lsm_update_rules()` performs a separate `synchronize_rcu()` for every LSM rule, leaving a wide window. The one precondition outside attacker control is a concurrent SELinux policy reload/`setsebool`, a routine administrative event the attacker can simply hold a persistent trigger loop through (and can even detect via the unprivileged-readable selinuxfs status page).\nPR:L - Reaching `ima_match_policy()` requires only the ability to open files as an ordinary unprivileged local user; there is no capability check anywhere on the `path_openat → ima_file_check → ima_match_policy` path. No root or CAP_MAC_ADMIN is needed on the attacker's side.\nUI:N - The race is hit entirely by the attacker's own threads sleeping inside the RCU read-side critical section; no victim has to open a file, mount a filesystem, or perform any action for the UAF to occur.\nS:U - The freed `ima_rule_entry` and all resulting corruption are within the host kernel's own security authority. This is standard in-kernel memory corruption with no VM, IOMMU, or sandbox boundary crossed.\nC:H - After the early `synchronize_rcu()` return, the reader dereferences the freed rule's `list.next`, `fsname` (passed to `strcmp()`), and `template` pointers, so a heap spray of the reallocated `ima_rule_entry` yields attacker-directed kernel reads. Per kernel scoring guidance, a use-after-free is treated as High confidentiality impact.\nI:H - `struct ima_rule_entry` holds four function pointers (`uid_op`, `gid_op`, `fowner_op`, `fgroup_op`) that `ima_match_rules()` calls directly, plus `template`, whose `fields[i]->field_init()` is invoked in `ima_api.c` — controlling the reallocated object gives control-flow hijack. The attacker can also forge `entry->action`/`entry->flags` to suppress IMA measurement and appraisal, defeating the integrity subsystem itself.\nA:H - The reported real-world symptom is a kernel NULL-pointer dereference and panic in `ima_match_policy+0x84/0x450` reached from `do_sys_open()`. Any use-after-free of this kind reliably oopses or panics the machine even when not exploited further."
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