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CVE-2026-98588— bpf, sockmap: Reject max_entries > INT_MAX in sock_map_alloc

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，以下漏洞已被修复： BPF、Sockmap：在 中拒绝 的情况 函数仅会拒绝 的情况，而对于其他任何 值均予以接受。随后， 函数使用一个有符号整数迭代器来遍历 数组： 当创建 SOCKMAP 时，若将 设置为 （即 ），在拥有大内存的主机上，32 GiB 的内存分配可能会成功。然而，在释放过程中，计数器达到 时会发生回绕（wrap），变为 。随后， 指令会对其进行符号扩展，将其转换为一个约为 -16 GiB 的负偏移量，导致指针指向远低于实际分配区域的内存地址。 引发故障的访问操作是 中的

AI Predicted 7.8 Difficulty: Moderate

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 0d2c4f9640501ff57ba0be1f5644a02c29a02fa1< f4a73f49e256bd835368504462be3b57b03febff affected
0d2c4f9640501ff57ba0be1f5644a02c29a02fa1< c56191af3a578b9cc265fa3bd5fc0752c59c1781 affected
0d2c4f9640501ff57ba0be1f5644a02c29a02fa1< 909f761868fda329dc69130ef9eb5b5795bcdf00 affected
0d2c4f9640501ff57ba0be1f5644a02c29a02fa1< cc70972ddbf0e3398f2f32624d31db78594d50d8 affected
0d2c4f9640501ff57ba0be1f5644a02c29a02fa1< cea597519b9ca6d691c98d92460ead8ece2a07af affected
0d2c4f9640501ff57ba0be1f5644a02c29a02fa1< ba7d627dbc67d62df2fa66d7b41e743c3ace0ec8 affected
0d2c4f9640501ff57ba0be1f5644a02c29a02fa1< 814a81c842bd88f6bd8a4ce550d560df071a5d03 affected
5.11 affected
… +8 more rows
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I. Basic Information for CVE-2026-98588

Vulnerability Information
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Vulnerability Title
bpf, sockmap: Reject max_entries > INT_MAX in sock_map_alloc
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Reject max_entries > INT_MAX in sock_map_alloc sock_map_alloc() only rejects max_entries == 0 and otherwise allows any u32 value. sock_map_free() then walks the sks[] array with a signed int iterator: int i; for (i = 0; i < stab->map.max_entries; i++) struct sock **psk = &stab->sks[i]; When a SOCKMAP is created with max_entries = 0xffffffff (UINT_MAX), the allocation of 32 GiB can succeed on large-memory hosts. During free the counter reaches 0x80000000, wraps to INT_MIN, is sign-extended by movslq and turned into a ~16 GiB negative offset from stab->sks, pointing far below the allocation. The faulting access is an xchg() write in sock_map_free(). Without KASAN, the same out-of-bounds write can fault on an unmapped vmalloc page or corrupt an unrelated allocation if that vmalloc address is populated. On a KASAN kernel with CONFIG_KASAN_VMALLOC=y, the shadow check for that address hits an unmapped shadow page and oopses first: BUG: unable to handle page fault for address: fffff521b59c5a00 RIP: 0010:kasan_check_range+0x107/0x190 Call Trace: sock_map_free+0x93/0x190 map_create+0x68d/0xb30 __sys_bpf+0x21e/0x2e70 Vmcore confirmed stab->map.max_entries == 0xffffffff, stab->sks == 0xffffc911ace2d000, and the faulting address sks + (s64)INT_MIN * 8 exactly at 0xffffc90dace2d000. The same buggy path is reached on the normal close()/bpf_map_free_deferred() path whenever such a map is destroyed. sock_map_alloc() used to bound its allocation size through bpf_map_charge_init(), but the bound was dropped when rlimit-based memory accounting was removed. Reject max_entries > INT_MAX at creation time so the signed iterator in sock_map_free() never sees a value that would overflow. Triggered by syzkaller and reproduced on both a 6.6-based KASAN kernel and the upstream v7.3-rc2 kernel.
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 0d2c4f9640501ff57ba0be1f5644a02c29a02fa1 ~ f4a73f49e256bd835368504462be3b57b03febff -
Linux Linux 5.11 -

II. Public POCs for CVE-2026-98588

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III. Intelligence Information for CVE-2026-98588

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Patches & Fixes for CVE-2026-98588 (7)

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

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