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CVE-2026-53263— 6lowpan: fix off-by-one in multicast context address compression

AI Predicted 7.5 Difficulty: Moderate EPSS 0.17% · P7

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux5609c185f24dffca5f6a9c127106869da150be03< f24a58c72a45f4c109f3557a760cc4b60b7a6037affected
5609c185f24dffca5f6a9c127106869da150be03< da8cbb64b47e9066b40af0de170901caf17b768caffected
5609c185f24dffca5f6a9c127106869da150be03< 4485d79617520d84ba5a14515e2b5136007d6debaffected
5609c185f24dffca5f6a9c127106869da150be03< 06ce6fc106b16dec9b535950db626261be865e5baffected
5609c185f24dffca5f6a9c127106869da150be03< dcb1bec1c32ee5c3878354e087cf5dbee2b7c7afaffected
5609c185f24dffca5f6a9c127106869da150be03< c32f30ef5e66adbfa102348e2e8a23776eb007cbaffected
5609c185f24dffca5f6a9c127106869da150be03< da8808463882c3f3c357b072e25053c2121f1419affected
5609c185f24dffca5f6a9c127106869da150be03< 2a58899d11009bffc7b4b32a571858f381121837affected
… +10 more rows
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I. Basic Information for CVE-2026-53263

Vulnerability Information
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Vulnerability Title
6lowpan: fix off-by-one in multicast context address compression
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: 6lowpan: fix off-by-one in multicast context address compression The second memcpy in lowpan_iphc_mcast_ctx_addr_compress() uses &data[1] as destination and &ipaddr->s6_addr[11] as source, but both should be offset by one: &data[2] and &ipaddr->s6_addr[12] respectively. This off-by-one has two consequences: 1. data[1] is overwritten with s6_addr[11], corrupting the RIID field in the compressed multicast address 2. data[5] is never written, so uninitialized kernel stack memory is transmitted over the network via lowpan_push_hc_data(), leaking kernel stack contents The correct inline data layout must match what the decompression function lowpan_uncompress_multicast_ctx_daddr() expects: data[0..1] = s6_addr[1..2] (flags/scope + RIID) data[2..5] = s6_addr[12..15] (group ID) Also zero-initialize the data array as a defensive measure against similar bugs in the future.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于6lowpan组播上下文地址压缩中存在差一错误，可能导致RIID字段损坏和未初始化内核栈内存泄露。
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 5609c185f24dffca5f6a9c127106869da150be03 ~ f24a58c72a45f4c109f3557a760cc4b60b7a6037 -
LinuxLinux 4.6 -

II. Public POCs for CVE-2026-53263

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III. Intelligence Information for CVE-2026-53263

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Patches & Fixes for CVE-2026-53263 (8)

Same Patch Batch · Linux · 2026-06-25 · 147 CVEs total

CVE-2026-531759.8 CRITICALinet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-531769.8 CRITICALIB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
CVE-2026-532219.8 CRITICALip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
CVE-2026-532169.8 CRITICALnet: mvpp2: limit XDP frame size to the RX buffer
CVE-2026-532289.8 CRITICALipv6: sit: reload inner IPv6 header after GSO offloads
CVE-2026-531519.8 CRITICALrxrpc: Fix the ACK parser to extract the SACK table for parsing
CVE-2026-532159.8 CRITICALnet: mvpp2: refill RX buffers before XDP or skb use
CVE-2026-532609.8 CRITICALtcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
CVE-2026-532479.8 CRITICALnet: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
CVE-2026-532469.8 CRITICALsctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-531319.4 CRITICALnetfilter: require Ethernet MAC header before using eth_hdr()
CVE-2026-532249.1 CRITICALsctp: validate embedded INIT chunk and address list lengths in cookie
CVE-2026-531869.1 CRITICALRDMA/srp: bound SRP_RSP sense copy by the received length
CVE-2026-532259.1 CRITICALsctp: fix uninit-value in __sctp_rcv_asconf_lookup()
CVE-2026-532008.8 HIGHKVM: arm64: nv: Fix handling of XN[0] when !FEAT_XNX
CVE-2026-532778.8 HIGHKVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation
CVE-2026-532328.8 HIGHnet: phy: clean the sfp upstream if phy probing fails
CVE-2026-531988.8 HIGHksmbd: fix use-after-free of a deferred file_lock on double SMB2_CANCEL
CVE-2026-532408.8 HIGHxfrm: iptfs: fix use-after-free on first_skb in __input_process_payload
CVE-2026-531888.8 HIGHRDMA/core: Validate the passed in fops for ib_get_ucaps()

Showing top 20 of 147 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53263

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