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CVE-2026-74435— rxrpc: rxrpc_verify_data ensure rx_dec_buffer 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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 7.1版本存在安全漏洞，该漏洞源于rxrpc_verify_data函数在rx_dec_buffer未分配时未正确分配，可能导致空指针解引用。

CVSS 7.5 · High EPSS 0.63% · P49

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 17

VendorProduct Version RangeStatus
Linux Linux a05bf6d9e621fa71e89ccebe3047ba45218d7b38< 8bbede0afced346b24e4fbde0c68cf12980ba948 affected
b94a6ccbaf1104dd980150a65fdeb2f69d17d2f5< 6563b4eb38c35d75892445bcf8aacdc29914821c affected
46cb765e2e5ad52303ea157e10d370bb6b7acbbf< d3b642cf95d48234590cc91450d8705a9bf6b540 affected
d2bc90cf6c75cb96d2ce549be6c35efa3099d25b< a962bc8508592c4d51092edac68579bd8b18fe44 affected
d2bc90cf6c75cb96d2ce549be6c35efa3099d25b< 16c8ae9735c5bd7e54dd7478d6348e0fc860842d affected
c580087743712112778a06d65a4074053072d7bf affected
6.6.143< 6.6.145 affected
6.12.93< 6.12.97 affected
… +9 more rows
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I. Basic Information for CVE-2026-74435

Vulnerability Information
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Vulnerability Title
rxrpc: rxrpc_verify_data ensure rx_dec_buffer alloc
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: rxrpc_verify_data ensure rx_dec_buffer alloc rxrpc_recvmsg_data() calls rxrpc_verify_data() whenever the rxrpc_call.rx_dec_buffer is unallocated and assumes that upon successful return that rx_dec_buffer must be allocated. However, rxrpc_verify_data() does not request an allocation if the rxrpc_skb_priv.len is zero. In addition, failure to allocate rx_dec_buffer will result in a call to skb_copy_bits() with a NULL destination which can trigger a NULL pointer dereference. To prevent these issues rxrpc_verify_data() is modified to always attempt to allocate the rxrpc_call.rx_dec_buffer if it is NULL. This issue was identified with assistance of a private sashiko instance.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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基金会开源的一个操作系统内核。 Linux kernel 7.1版本存在安全漏洞，该漏洞源于rxrpc_verify_data函数在rx_dec_buffer未分配时未正确分配，可能导致空指针解引用。
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 a05bf6d9e621fa71e89ccebe3047ba45218d7b38 ~ 8bbede0afced346b24e4fbde0c68cf12980ba948 -
Linux Linux 7.1 -

II. Public POCs for CVE-2026-74435

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III. Intelligence Information for CVE-2026-74435

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Patches & Fixes for CVE-2026-74435 (5)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74398 9.8 CRITICAL ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD
CVE-2026-72191 9.8 CRITICAL ntfs3: validate split-point offset in indx_insert_into_buffer
CVE-2026-74401 9.8 CRITICAL dlm: fix add msg handle in send_queue ordered
CVE-2026-72084 9.8 CRITICAL scsi: target: Bound PR-OUT TransportID parsing to the received buffer
CVE-2026-72083 9.8 CRITICAL scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE
CVE-2026-74315 9.8 CRITICAL lockd: Avoid hashing uninitialized bytes in nlm4svc_lookup_file()
CVE-2026-72249 9.8 CRITICAL netfilter: flowtable: use dst in this direction when pushing IPIP header
CVE-2026-74493 9.8 CRITICAL net/smc: fix socket use-after-free during link group termination
CVE-2026-74345 9.8 CRITICAL RDMA/siw: Fix endpoint/socket association handling
CVE-2026-72251 9.8 CRITICAL netfilter: nf_nat_sip: reload possible stale data pointer
CVE-2026-72248 9.8 CRITICAL netfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-74495 9.8 CRITICAL igbvf: Fix leak in TX DMA error cleanup

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74435

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