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CVE-2026-53096— bpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB path

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基金会开源的操作系统Linux所使用的内核。 Linux kernel 5.14版本存在安全漏洞，该漏洞源于在dev_map_redirect_multi()函数中，DEVMAP_HASH分支使用hlist_for_each_entry_safe()进行哈希桶迭代时，未使用rcu_dereference()进行指针解引用，缺少与写入方rcu_assign_pointer()配对的获取屏障，可能导致弱序架构上观察到部分构造的节点。

CVSS 7.8 · High EPSS 0.13% · P2

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux e624d4ed4aa8cc3c69d1359b0aaea539203ed266< 4a3d0fe30b907ff324b1b49756f7e713d67f3645 affected
e624d4ed4aa8cc3c69d1359b0aaea539203ed266< b089aa6e94d7a08e74d076a0fe274842dc9feccc affected
e624d4ed4aa8cc3c69d1359b0aaea539203ed266< 571a05ea1baaccc0dc1e0d227b2cbc978b96d392 affected
e624d4ed4aa8cc3c69d1359b0aaea539203ed266< cb2c1f3cf65b855548e1b8d55a08bfbaa5a0901a affected
e624d4ed4aa8cc3c69d1359b0aaea539203ed266< d4c4bd231ebad70e6f30db429e9640bf378b2f52 affected
e624d4ed4aa8cc3c69d1359b0aaea539203ed266< 7027e705062482a8cea43a1c13ede3c35653966f affected
e624d4ed4aa8cc3c69d1359b0aaea539203ed266< 8ed82f807bb09d2c8455aaa665f2c6cb17bc6a19 affected
5.14 affected
… +8 more rows
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I. Basic Information for CVE-2026-53096

Vulnerability Information
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Vulnerability Title
bpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB path The DEVMAP_HASH branch in dev_map_redirect_multi() uses hlist_for_each_entry_safe() to iterate hash buckets, but this function runs under RCU protection (called from xdp_do_generic_redirect_map() in softirq context). Concurrent writers (__dev_map_hash_update_elem, dev_map_hash_delete_elem) modify the list using RCU primitives (hlist_add_head_rcu, hlist_del_rcu). hlist_for_each_entry_safe() performs plain pointer dereferences without rcu_dereference(), missing the acquire barrier needed to pair with writers' rcu_assign_pointer(). On weakly-ordered architectures (ARM64, POWER), a reader can observe a partially-constructed node. It also defeats CONFIG_PROVE_RCU lockdep validation and KCSAN data-race detection. Replace with hlist_for_each_entry_rcu() using rcu_read_lock_bh_held() as the lockdep condition, consistent with the rcu_dereference_check() used in the DEVMAP (non-hash) branch of the same functions. Also fix the same incorrect lockdep_is_held(&dtab->index_lock) condition in dev_map_enqueue_multi(), where the lock is not held either.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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基金会开源的操作系统Linux所使用的内核。 Linux kernel 5.14版本存在安全漏洞，该漏洞源于在dev_map_redirect_multi()函数中，DEVMAP_HASH分支使用hlist_for_each_entry_safe()进行哈希桶迭代时，未使用rcu_dereference()进行指针解引用，缺少与写入方rcu_assign_pointer()配对的获取屏障，可能导致弱序架构上观察到部分构造的节点。
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 e624d4ed4aa8cc3c69d1359b0aaea539203ed266 ~ 4a3d0fe30b907ff324b1b49756f7e713d67f3645 -
Linux Linux 5.14 -

II. Public POCs for CVE-2026-53096

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III. Intelligence Information for CVE-2026-53096

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Patches & Fixes for CVE-2026-53096 (5)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53096

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