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CVE-2026-31637— rxrpc: reject undecryptable rxkad response tickets

CVSS 9.8 · Critical EPSS 0.51% · P40

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux17926a79320afa9b95df6b977b40cca6d8713cea< 252157d939d179b5d767cb860ff8fa7f8723b67aaffected
17926a79320afa9b95df6b977b40cca6d8713cea< a75b3b361dd481d942c5f259a82d59718a41092caffected
17926a79320afa9b95df6b977b40cca6d8713cea< b3a808cd0790b5075aaa2bc3588edf02cd71d352affected
17926a79320afa9b95df6b977b40cca6d8713cea< 47073aab8a3a5a7b41c9bd37d2a3dcbeeccd6c8aaffected
17926a79320afa9b95df6b977b40cca6d8713cea< a149dcae23309df9de1c3b6b5d468610ef5ab7deaffected
17926a79320afa9b95df6b977b40cca6d8713cea< 22f6258e7b31dba9bf88dce4e3ee7f0f20072e60affected
17926a79320afa9b95df6b977b40cca6d8713cea< 58fcd1b156152613ba00a064a129fb69507ddd7daffected
17926a79320afa9b95df6b977b40cca6d8713cea< fe4447cd95623b1cfacc15f280aab73a6d7340b2affected
… +10 more rows
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I. Basic Information for CVE-2026-31637

Vulnerability Information
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Vulnerability Title
rxrpc: reject undecryptable rxkad response tickets
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: reject undecryptable rxkad response tickets rxkad_decrypt_ticket() decrypts the RXKAD response ticket and then parses the buffer as plaintext without checking whether crypto_skcipher_decrypt() succeeded. A malformed RESPONSE can therefore use a non-block-aligned ticket length, make the decrypt operation fail, and still drive the ticket parser with attacker-controlled bytes. Check the decrypt result and abort the connection with RXKADBADTICKET when ticket decryption fails.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于rxkad_decrypt_ticket函数未检查解密操作是否成功，导致恶意RESPONSE可以使用非块对齐的票据长度驱动解析器读取攻击者控制的字节。
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)

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Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 17926a79320afa9b95df6b977b40cca6d8713cea ~ 252157d939d179b5d767cb860ff8fa7f8723b67a -
LinuxLinux 2.6.22 -

II. Public POCs for CVE-2026-31637

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III. Intelligence Information for CVE-2026-31637

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Patches & Fixes for CVE-2026-31637 (3)

Same Patch Batch · Linux · 2026-04-24 · 138 CVEs total

CVE-2026-316339.8 CRITICALrxrpc: Fix integer overflow in rxgk_verify_response()
CVE-2026-315899.8 CRITICALmm: call ->free_folio() directly in folio_unmap_invalidate()
CVE-2026-315369.8 CRITICALsmb: server: let send_done handle a completion without IB_SEND_SIGNALED
CVE-2026-316699.8 CRITICALmptcp: fix slab-use-after-free in __inet_lookup_established
CVE-2026-316689.8 CRITICALseg6: separate dst_cache for input and output paths in seg6 lwtunnel
CVE-2026-316499.8 CRITICALnet: stmmac: fix integer underflow in chain mode
CVE-2026-316079.8 CRITICALusbip: validate number_of_packets in usbip_pack_ret_submit()
CVE-2026-316089.8 CRITICALsmb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list
CVE-2026-316099.8 CRITICALsmb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
CVE-2026-316579.8 CRITICALbatman-adv: hold claim backbone gateways by reference
CVE-2026-316599.8 CRITICALbatman-adv: reject oversized global TT response buffers
CVE-2026-316369.1 CRITICALrxrpc: fix RESPONSE authenticator parser OOB read
CVE-2026-316298.8 HIGHnfc: llcp: add missing return after LLCP_CLOSED checks
CVE-2026-315888.8 HIGHKVM: x86: Use scratch field in MMIO fragment to hold small write values
CVE-2026-315708.8 HIGHcan: gw: fix OOB heap access in cgw_csum_crc8_rel()
CVE-2026-316228.8 HIGHNFC: digital: Bounds check NFC-A cascade depth in SDD response handler
CVE-2026-315588.8 HIGHLoongArch: KVM: Make kvm_get_vcpu_by_cpuid() more robust
CVE-2026-315538.8 HIGHKVM: arm64: Fix the descriptor address in __kvm_at_swap_desc()
CVE-2026-316118.6 HIGHksmbd: require 3 sub-authorities before reading sub_auth[2]
CVE-2026-316318.2 HIGHrxrpc: Fix buffer overread in rxgk_do_verify_authenticator()

Showing top 20 of 138 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31637

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