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CVE-2026-98589— bpf: Reject pkt arguments in mutating subprogs

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.

在 Linux 内核中，以下漏洞已得到修复： bpf：拒绝在可修改数据包（mutating）的子程序（subprog）中使用数据包（pkt）参数 验证器（verifier）会追踪 寄存器边界在子程序边界之间的变化。实际上， 寄存器是以 的形式传递的，并假设在整个调用过程中该指针始终有效。然而，对于数据包内存而言，情况并非如此：调用 函数可能会使该内存区域失效。 因此，BPF 验证器将拒绝那些将 指针传递给可能修改数据包的子程序的 BPF 代码。我们无法以真正的 形式传递该指针，因为这样做还需要将 或 一同传递给子程

AI Predicted 7.8 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 5

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 0b6b2bb9b90ad1e2d94d18f626258a1dbbdee0ea affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a6c1edfbe240e4377038a0e1d233ad81fde9a21b affected
< 7.2.9 affected
7.2.9≤ 7.2.* unaffected
7.3-rc5≤ * unaffected
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I. Basic Information for CVE-2026-98589

Vulnerability Information
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Vulnerability Title
bpf: Reject pkt arguments in mutating subprogs
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject pkt arguments in mutating subprogs The verifier tracks changes in how PTR_TO_PACKET registers' bounds are modified across subprog boundaries. PTR_TO_PACKET registers are actually passed as PTR_TO_MEM, which is assumed valid for the entire call. This is not the case with packet memory, where a pskb_* call may invalidate its memory region. Reject BPF code that passes PTR_TO_PACKET pointers to subprogs that may mutate a packet. We cannot pass the pointer as a true PTR_TO_PACKET because we would also need to somehow pass the PTR_TO_PACKET_META or PTR_TO_PACKET_END to the subprog. Since we cannot avoid representing the pointer in the subprog as PTR_TO_MEM, only permit it if the subprog is guaranteed not to mutate the packet.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 0b6b2bb9b90ad1e2d94d18f626258a1dbbdee0ea -
Linux Linux 7.2.9 ~ 7.2.* -

II. Public POCs for CVE-2026-98589

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III. Intelligence Information for CVE-2026-98589

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Patches & Fixes for CVE-2026-98589 (2)

Same Patch Batch · Linux · 2026-10-18 · 436 CVEs total

CVE-2026-98582 nfc: st21nfca: validate received frame size
CVE-2026-98568 vxlan: use one headroom snapshot for neighbour replies
CVE-2026-98570 net: ipv6: keep room for the mac header in dst_dev_overhead()
CVE-2026-98571 net: stmmac: clear stale buf->page after recycling on skb build failure
CVE-2026-98572 bpf: Fix immediate JMP JEQ/JNE on MIPS32
CVE-2026-98573 net: skbuff: fix pull-bound underflow in skb_checksum_setup_ipv6()
CVE-2026-98574 net: bcmgenet: stop Tx NAPI before disabling the queues
CVE-2026-98575 nfc: pn533: fix OOB read in pn533_acr122_is_rx_frame_valid()
CVE-2026-98576 nfc: llcp: fix slab-out-of-bounds reads when logging service names
CVE-2026-98577 nfc: llcp: fix WKS SAP hijacking via prefix match in nfc_llcp_wks_sap()
CVE-2026-98578 nfc: st21nfca: validate ISO15693 inventory length
CVE-2026-98579 nfc: llcp: fix sdreq TLV list leak on parse/alloc/send failure
CVE-2026-98580 nfc: llcp: Fix race condition in accept_queue lifecycle
CVE-2026-98581 nfc: llcp: Fix list corruption / refcount desync in nfc_llcp_recv_dm()
CVE-2026-98594 tg3: clean up PHYLIB resources on probe failure
CVE-2026-98591 bpf: Fix bounds check for skb-backed dynptrs
CVE-2026-98592 net: spacemit: clear TX descriptor on fragment mapping failure
CVE-2026-98593 s390/debug: Fix NULL pointer dereference in debug_info_copy()
CVE-2026-98590 bpf: Fix bpf_sock context code generation
CVE-2026-98595 udp: remove a disconnected socket from the 4-tuple hash table

Showing top 20 of 436 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98589

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