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CVE-2026-43333— bpf: reject direct access to nullable PTR_TO_BUF pointers

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 5.6 Difficulty: Hard EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 19

VendorProduct Version RangeStatus
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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux b453361384c2db1c703dacb806d5fd36aec4ceca ~ 10bc4a4dcded509c5d5c67d497900c3922c604cd -
Linux Linux 5.17 -

II. Public POCs for CVE-2026-43333

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III. Intelligence Information for CVE-2026-43333

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Patches & Fixes for CVE-2026-43333 (7)

Same Patch Batch · Linux · 2026-05-08 · 197 CVEs total

CVE-2026-43341 9.8 CRITICAL net/ipv6: ioam6: prevent schema length wraparound in trace fill
CVE-2026-43402 9.8 CRITICAL kthread: consolidate kthread exit paths to prevent use-after-free
CVE-2026-43414 9.8 CRITICAL scsi: qla2xxx: Completely fix fcport double free
CVE-2026-43384 9.8 CRITICAL net/tcp-ao: Fix MAC comparison to be constant-time
CVE-2026-43304 9.8 CRITICAL libceph: define and enforce CEPH_MAX_KEY_LEN
CVE-2026-43379 9.8 CRITICAL ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
CVE-2026-43376 9.8 CRITICAL ksmbd: fix use-after-free by using call_rcu() for oplock_info
CVE-2026-43465 9.8 CRITICAL net/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ
CVE-2026-43378 9.8 CRITICAL smb: server: fix use-after-free in smb2_open()
CVE-2026-43383 9.4 CRITICAL net/tcp-md5: Fix MAC comparison to be constant-time
CVE-2026-43406 9.1 CRITICAL libceph: prevent potential out-of-bounds reads in process_message_header()
CVE-2026-43407 9.1 CRITICAL libceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()
CVE-2026-43284 8.8 HIGH xfrm: esp: avoid in-place decrypt on shared skb frags
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-2026-43403 8.8 HIGH nsfs: tighten permission checks for ns iteration ioctls
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-2026-43466 8.2 HIGH net/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery

Showing top 20 of 197 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43333

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