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CVE-2026-52914— batman-adv: fix fragment reassembly length accounting

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 3.13版本存在安全漏洞，该漏洞源于batman-adv片段重组长度计算问题，可能导致累积片段长度在更新时被截断，使得畸形片段链绕过验证导致长度状态不一致，进而引发本地拒绝服务。

CVSS 9.8 · Critical EPSS 0.51% · P42

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 610bfc6bc99bc83680d190ebc69359a05fc7f605< e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64 affected
610bfc6bc99bc83680d190ebc69359a05fc7f605< 37be61825b15534a16ff9cfc9546de155b6df982 affected
610bfc6bc99bc83680d190ebc69359a05fc7f605< 975563c5de1123dde1ec7946bf5556d20c89d74e affected
610bfc6bc99bc83680d190ebc69359a05fc7f605< f653b040dad1af70fa5cd4fe085e4758925480c9 affected
610bfc6bc99bc83680d190ebc69359a05fc7f605< e910dbf509125fe51ad68e4fa74dc8ab0a8e787a affected
610bfc6bc99bc83680d190ebc69359a05fc7f605< 3eb8bcb823391bd58997831b3c9c152a4ba8e255 affected
610bfc6bc99bc83680d190ebc69359a05fc7f605< fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0 affected
610bfc6bc99bc83680d190ebc69359a05fc7f605< 9cd3f16c320bfdadd4509358122368deb56a5741 affected
… +10 more rows
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I. Basic Information for CVE-2026-52914

Vulnerability Information
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Vulnerability Title
batman-adv: fix fragment reassembly length accounting
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: fix fragment reassembly length accounting batman-adv keeps a running payload length for queued fragments and uses it to validate a fragment chain before reassembly. That accounting currently allows the accumulated fragment length to be truncated during updates. As a result, malformed fragment chains can bypass the intended validation and drive reassembly with inconsistent length state, leading to a local denial of service. Fix the accounting by storing the accumulated length in a length-typed field and rejecting update overflows before the existing validation logic runs. The fix was verified against the original reproducer and against valid fragment reassembly paths.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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 3.13版本存在安全漏洞，该漏洞源于batman-adv片段重组长度计算问题，可能导致累积片段长度在更新时被截断，使得畸形片段链绕过验证导致长度状态不一致，进而引发本地拒绝服务。
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 610bfc6bc99bc83680d190ebc69359a05fc7f605 ~ e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64 -
Linux Linux 3.13 -

II. Public POCs for CVE-2026-52914

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III. Intelligence Information for CVE-2026-52914

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Patches & Fixes for CVE-2026-52914 (8)

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-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
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-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()
CVE-2026-52968 8.8 HIGH KVM: s390: pci: fix GAIT table indexing due to double-scaling pointer arithmetic

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-2026-52914

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