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CVE-2026-43070— bpf: Reset register ID for BPF_END value tracking

CVSS 7.8 · High EPSS 0.01% · P2
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I. Basic Information for CVE-2026-43070

Vulnerability Information
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Vulnerability Title
bpf: Reset register ID for BPF_END value tracking
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Reset register ID for BPF_END value tracking When a register undergoes a BPF_END (byte swap) operation, its scalar value is mutated in-place. If this register previously shared a scalar ID with another register (e.g., after an `r1 = r0` assignment), this tie must be broken. Currently, the verifier misses resetting `dst_reg->id` to 0 for BPF_END. Consequently, if a conditional jump checks the swapped register, the verifier incorrectly propagates the learned bounds to the linked register, leading to false confidence in the linked register's value and potentially allowing out-of-bounds memory accesses. Fix this by explicitly resetting `dst_reg->id` to 0 in the BPF_END case to break the scalar tie, similar to how BPF_NEG handles it via `__mark_reg_known`.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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_END操作后未重置寄存器ID，可能导致验证器错误传播边界，造成越界内存访问。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 4c03342e5ac532fb34d13a7b51dd7261dfc48963 ~ a17443af874229408ce6b78e2c8a2b5adeb4b7d8 -
LinuxLinux 6.18.17 ~ 6.18.21 -

II. Public POCs for CVE-2026-43070

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III. Intelligence Information for CVE-2026-43070

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Same Patch Batch · Linux · 2026-05-05 · 15 CVEs total

CVE-2026-430679.8 CRITICALext4: handle wraparound when searching for blocks for indirect mapped blocks
CVE-2026-430719.1 CRITICALdcache: Limit the minimal number of bucket to two
CVE-2026-430637.8 HIGHxfs: don't irele after failing to iget in xfs_attri_recover_work
CVE-2026-430607.8 HIGHnetfilter: nft_ct: drop pending enqueued packets on removal
CVE-2026-430627.1 HIGHBluetooth: L2CAP: Fix type confusion in l2cap_ecred_reconf_rsp()
CVE-2026-43073x86-64: rename misleadingly named '__copy_user_nocache()' function
CVE-2026-43072drm/vc4: platform_get_irq_byname() returns an int
CVE-2026-43069Bluetooth: hci_ll: Fix firmware leak on error path
CVE-2026-43068ext4: avoid allocate block from corrupted group in ext4_mb_find_by_goal()
CVE-2026-43066ext4: fix iloc.bh leak in ext4_fc_replay_inode() error paths
CVE-2026-43065ext4: always drain queued discard work in ext4_mb_release()
CVE-2026-43064dmaengine: idxd: Fix not releasing workqueue on .release()
CVE-2026-43061serial: 8250: Fix TX deadlock when using DMA
CVE-2026-43059Bluetooth: MGMT: Fix list corruption and UAF in command complete handlers

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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