CVE-2026-43333— bpf: reject direct access to nullable PTR_TO_BUF pointers
Possible ATT&CK Techniques 1AI
T1068 · Exploitation for Privilege EscalationAffected Version Matrix 19
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | b453361384c2db1c703dacb806d5fd36aec4ceca< 10bc4a4dcded509c5d5c67d497900c3922c604cd | affected |
20b2aff4bc15bda809f994761d5719827d66c0b4< 21a10c06ffae24cb01fd174a7ab7736001d2ea56 | affected | ||
20b2aff4bc15bda809f994761d5719827d66c0b4< 8755066f7bd0f4ac46a29d1708c7b20894539252 | affected | ||
20b2aff4bc15bda809f994761d5719827d66c0b4< 70abd9d118da2f56beb4ec22e3a29becae373535 | affected | ||
20b2aff4bc15bda809f994761d5719827d66c0b4< 63276547debc4d8a73eefb2c5273b2a905c961b0 | affected | ||
20b2aff4bc15bda809f994761d5719827d66c0b4< 4f6c99dc0420f1a3d671c1b8ab8a7ac84d9cba09 | affected | ||
20b2aff4bc15bda809f994761d5719827d66c0b4< b0db1accbc7395657c2b79db59fa9fae0d6656f3 | affected | ||
e982070f8970bb62e69ed7c9cafff886ed200349 | affected | ||
| … +11 more rows | |||
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I. Basic Information for CVE-2026-43333
Vulnerability Information
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Vulnerability Title
bpf: reject direct access to nullable PTR_TO_BUF pointers
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: reject direct access to nullable PTR_TO_BUF pointers check_mem_access() matches PTR_TO_BUF via base_type() which strips PTR_MAYBE_NULL, allowing direct dereference without a null check. Map iterator ctx->key and ctx->value are PTR_TO_BUF | PTR_MAYBE_NULL. On stop callbacks these are NULL, causing a kernel NULL dereference. Add a type_may_be_null() guard to the PTR_TO_BUF branch, matching the existing PTR_TO_BTF_ID pattern.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于BPF中check_mem_access函数通过base_type匹配PTR_TO_BUF指针时未检查PTR_MAYBE_NULL标志，允许直接解引用空指针，导致内核空指针解引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-43333
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-43333 (7)
Same Patch Batch · Linux · 2026-05-08 · 197 CVEs total
| CVE-2026-43402 | 9.8 CRITICAL | kthread: consolidate kthread exit paths to prevent use-after-free |
| CVE-2026-43384 | 9.8 CRITICAL | net/tcp-ao: Fix MAC comparison to be constant-time |
| CVE-2026-43414 | 9.8 CRITICAL | scsi: qla2xxx: Completely fix fcport double free |
| CVE-2026-43304 | 9.8 CRITICAL | libceph: define and enforce CEPH_MAX_KEY_LEN |
| CVE-2026-43341 | 9.8 CRITICAL | net/ipv6: ioam6: prevent schema length wraparound in trace fill |
| CVE-2026-43376 | 9.8 CRITICAL | ksmbd: fix use-after-free by using call_rcu() for oplock_info |
| CVE-2026-43378 | 9.8 CRITICAL | smb: server: fix use-after-free in smb2_open() |
| CVE-2026-43379 | 9.8 CRITICAL | ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close() |
| CVE-2026-43465 | 9.8 CRITICAL | net/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ |
| CVE-2026-43383 | 9.4 CRITICAL | net/tcp-md5: Fix MAC comparison to be constant-time |
| CVE-2026-43407 | 9.1 CRITICAL | libceph: Fix potential out-of-bounds access in ceph_handle_auth_reply() |
| CVE-2026-43406 | 9.1 CRITICAL | libceph: prevent potential out-of-bounds reads in process_message_header() |
| CVE-2026-43284 | 8.8 HIGH | xfrm: esp: avoid in-place decrypt on shared skb frags |
| CVE-2026-43403 | 8.8 HIGH | nsfs: tighten permission checks for ns iteration ioctls |
| CVE-2026-43334 | 8.8 HIGH | Bluetooth: SMP: force responder MITM requirements before building the pairing response |
| CVE-2026-43322 | 8.8 HIGH | Bluetooth: hci_sync: Fix UAF in le_read_features_complete |
| CVE-2026-43391 | 8.8 HIGH | nsfs: tighten permission checks for handle opening |
| CVE-2026-43291 | 8.3 HIGH | net: nfc: nci: Fix parameter validation for packet data |
| CVE-2026-43365 | 8.2 HIGH | xfs: fix undersized l_iclog_roundoff values |
| CVE-2026-43452 | 8.2 HIGH | netfilter: x_tables: guard option walkers against 1-byte tail reads |
Showing top 20 of 197 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-53363
xfrm: iptfs: preserve shared-frag marker in iptfs_consume_fr - CVE-2026-53362
ipv6: account for fraggap on the paged allocation path - CVE-2026-53361
af_unix: Set gc_in_progress to true in unix_gc(). - CVE-2026-53360
KVM: SEV: Require in-GHCB scratch area if GHCB v2+ is in use - CVE-2026-53359
KVM: x86: Fix shadow paging use-after-free due to unexpected
Same vendor: Linux
- CVE-2026-53363
xfrm: iptfs: preserve shared-frag marker in iptfs_consume_fr - CVE-2026-53362
ipv6: account for fraggap on the paged allocation path - CVE-2026-53361
af_unix: Set gc_in_progress to true in unix_gc(). - CVE-2026-53360
KVM: SEV: Require in-GHCB scratch area if GHCB v2+ is in use - CVE-2026-53359
KVM: x86: Fix shadow paging use-after-free due to unexpected
V. Comments for CVE-2026-43333
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