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CVE-2026-74436— rxrpc: serialize kernel accept preallocation with socket teardown

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 4.9版本存在安全漏洞，该漏洞源于rxrpc_kernel_charge_accept()函数读取rx->backlog时缺乏同步，可能导致释放后重用。

CVSS 9.8 · Critical EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 00e907127e6f86d0f9b122d9b4347a8aa09a8b61< d6207326b4ca0ae1041281b6af9df53f8080669a affected
00e907127e6f86d0f9b122d9b4347a8aa09a8b61< 11b429b84c87cb5a0152f14e7d6cb649ed363901 affected
00e907127e6f86d0f9b122d9b4347a8aa09a8b61< c20d983968f239574290cf804a58cde18ad1c559 affected
00e907127e6f86d0f9b122d9b4347a8aa09a8b61< 0337cdba0c477f176c0459bed012109453184573 affected
00e907127e6f86d0f9b122d9b4347a8aa09a8b61< dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5 affected
00e907127e6f86d0f9b122d9b4347a8aa09a8b61< 35a967ff8b24db09ee429c39c5b5e6571639997d affected
00e907127e6f86d0f9b122d9b4347a8aa09a8b61< 1741378a7a83dfd8e53a9196730df709b903cd33 affected
00e907127e6f86d0f9b122d9b4347a8aa09a8b61< dc175389b18c29a5303ee83169ec653adfae3e17 affected
… +10 more rows
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I. Basic Information for CVE-2026-74436

Vulnerability Information
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Vulnerability Title
rxrpc: serialize kernel accept preallocation with socket teardown
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: serialize kernel accept preallocation with socket teardown rxrpc_kernel_charge_accept() reads rx->backlog without any socket/backlog synchronization and passes that raw pointer into rxrpc_service_prealloc_one(). A concurrent rxrpc_discard_prealloc() sets rx->backlog = NULL and frees the backlog rings, so a kernel preallocation worker can keep using a freed struct rxrpc_backlog while updating *_backlog_head/tail and array slots. Serialize the state check and backlog lookup with the socket lock, and reject kernel preallocation once teardown has disabled listening or discarded the service backlog.
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基金会开源的一个操作系统内核。 Linux kernel 4.9版本存在安全漏洞，该漏洞源于rxrpc_kernel_charge_accept()函数读取rx->backlog时缺乏同步，可能导致释放后重用。
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 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 ~ d6207326b4ca0ae1041281b6af9df53f8080669a -
Linux Linux 4.9 -

II. Public POCs for CVE-2026-74436

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III. Intelligence Information for CVE-2026-74436

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Patches & Fixes for CVE-2026-74436 (7)

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

CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72084 9.8 CRITICAL scsi: target: Bound PR-OUT TransportID parsing to the received buffer
CVE-2026-74480 9.8 CRITICAL net: bridge: stop fast-leave after deleting a port group
CVE-2026-72083 9.8 CRITICAL scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE
CVE-2026-72248 9.8 CRITICAL netfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-72249 9.8 CRITICAL netfilter: flowtable: use dst in this direction when pushing IPIP header
CVE-2026-72251 9.8 CRITICAL netfilter: nf_nat_sip: reload possible stale data pointer
CVE-2026-74493 9.8 CRITICAL net/smc: fix socket use-after-free during link group termination
CVE-2026-74495 9.8 CRITICAL igbvf: Fix leak in TX DMA error cleanup
CVE-2026-72191 9.8 CRITICAL ntfs3: validate split-point offset in indx_insert_into_buffer
CVE-2026-74398 9.8 CRITICAL ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD
CVE-2026-74315 9.8 CRITICAL lockd: Avoid hashing uninitialized bytes in nlm4svc_lookup_file()
CVE-2026-72046 9.8 CRITICAL gve: fix header buffer corruption with header-split and HW-GRO

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-2026-74436

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