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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsi: Reserve a terminator byte for the login payload\n\niscsi_target_check_login_request() rejects a login PDU whose\nDataSegmentLength exceeds MAX_KEY_VALUE_PAIRS, but the test is \u0027\u003e\u0027 and\nlogin-\u003ereq_buf is allocated with exactly MAX_KEY_VALUE_PAIRS\nbytes. Since iscsit_get_login_rx() receives payload_length + padding\nbytes, where\n\n\tpadding = ((-payload_length) \u0026 3);\n\nany payload_length from 8189 to 8192 fills the whole 8192 byte\nbuffer. The write stays in bounds, but no byte is left for a NUL\nterminator.\n\nThe buffer is subsequently consumed as a C string. In the CHAP path\nchap_check_algorithm() calls kstrdup(a_str), and extract_param() calls\nstrstr(in_buf, pattern) followed by strlen_semi(), none of which take a\nlength. convert_null_to_semi() additionally rewrites every embedded NUL\nto \u0027;\u0027, so even a payload made of well formed NUL separated key=value\nrecords is left without a terminator. These walk past the end of the\nobject into adjacent slab memory. It is reachable by an unauthenticated\ninitiator against a portal configured for CHAP; when authentication is\nnot required iscsi_login_zero_tsih_s2() rewrites AuthMethod to None and\nthe CHAP path is never entered.\n\nAllocate one extra byte. kzalloc() zeroes it and nothing ever writes to\nit, as every writer copies to offset 0 for at most MAX_KEY_VALUE_PAIRS\nbytes, so the buffer is always terminated."
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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              "value": "AV:N - The LIO in-kernel iSCSI target accepts remote TCP connections on the iSCSI portal (typically port 3260); a crafted Login PDU is received by iscsit_accept_np()/iscsit_get_login_rx() and reaches the CHAP parsers over the network, the same exposure model as nfsd or ksmbd.\nAC:L - The attacker fully controls DataSegmentLength and the login payload. A CHAP_A PDU of 8189-8192 bytes with no NUL, or a second CHAP round where convert_null_to_semi() strips every terminator, makes kstrdup()/strstr() over-read adjacent slab deterministically; no race or victim-side layout is required.\nPR:N - The over-read runs in the CHAP login handshake before the password hash is checked, so no Linux account or capability is needed. Default TPG authentication is CHAP (TA_AUTHENTICATION=1), and chap_server_open() proceeds once target-side CHAP credentials exist, which is the normal CHAP deployment.\nUI:N - The attacker opens a TCP connection to the listening portal and sends the malicious Login PDUs; no victim user action such as mounting a volume or accepting a prompt is required.\nS:U - The unbounded C-string over-read and any resulting kernel oops stay inside the host iSCSI target\u0027s kernel security authority and do not by themselves cross a VM, IOMMU, or sandbox boundary.\nC:H - chap_check_algorithm() kstrdup()s the unterminated 8192-byte req_buf, and extract_param() uses unbounded strstr()/strlen_semi() after convert_null_to_semi() removes embedded NULs, producing an unbounded out-of-bounds read of adjacent kmalloc-8k slab that can disclose neighboring kernel objects.\nI:N - iscsit_get_login_rx() copies at most MAX_KEY_VALUE_PAIRS bytes into req_buf, so the network write stays in bounds; convert_null_to_semi() also writes only within payload_length. There is no out-of-bounds write or control-flow hijack primitive.\nA:H - strlen()/kstrdup()/strstr() walking past the kmalloc-8k login object into unmapped or guard pages causes a kernel oops, and the attacker can repeat the unauthenticated login against an exposed portal, denying service to the host and its iSCSI clients."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: bound dirent name against end of SMB response in cifs_filldir\n\ncifs_filldir() copies the entry name out of an SMB1 TRANS2_FIND_FIRST /\nFIND_NEXT response using a length (de.namelen) supplied by the server.\nThe kmalloc\u0027d SMB response buffer is bounded, but nothing checks that\nde.name + de.namelen still lies inside that buffer before the eventual\nfilldir64() -\u003e verify_dirent_name() -\u003e memchr() reads namelen bytes.\n\nA hostile SMB1 server that returns an oversized FileNameLength in a\ndirectory entry therefore causes memchr() to read past the end of the\nresponse slab buffer. Reachable from any user who can list a directory\non a CIFS mount served by an attacker-controlled server (getdents64()\non the mounted directory):\n\n  BUG: KASAN: slab-out-of-bounds in memchr+0x71/0x80\n  Read of size 1 at addr ffff88800e0640cc by task poc/115\n  Call Trace:\n   dump_stack_lvl+0x64/0x80\n   print_report+0xce/0x620\n   kasan_report+0xec/0x120\n   memchr+0x71/0x80\n   filldir64+0x4c/0x6a0\n   cifs_filldir.constprop.0+0x9bb/0x1e00\n   cifs_readdir+0x2101/0x3380\n   iterate_dir+0x19c/0x520\n   __x64_sys_getdents64+0x126/0x210\n   do_syscall_64+0x107/0x5a0\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nPass the end-of-response pointer down to cifs_filldir() and reject\nentries whose name would extend past that boundary.\n\nThis bug was discovered by Artiphishell\u0027s vTriage pipeline, which\ngenerated a userspace reproducer (an emulated hostile SMB1 server plus\na getdents64() client) that reliably triggers the KASAN report on an\nunpatched kernel. The fix below was drafted with the Claude coding\nassistant; a userspace reproducer is available on request."
        }
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              "value": "AV:N - cifs_filldir() takes FileNameLength from an SMB1 TRANS2_FIND_FIRST/FIND_NEXT directory entry received over TCP/445; CIFSFindFirst() stores that PDU in srch_inf.ntwrk_buf_start and getdents64\u2192iterate_dir\u2192cifs_readdir() passes each entry to cifs_filldir(), so the oversized name length is protocol data from the remote SMB peer.\nAC:L - The hostile SMB1 server sets FileNameLength (cifs_fill_dirent_dir/full/search/both) and Flags2 unicode and can place FileName near the end of the CIFSFindFirst buffer so de.name+de.namelen exceeds end_of_smb; the old namelen\u003emax_len check only compared against the whole SMB size, so the overread is deterministic with no race.\nPR:N - The attacker is the remote SMB1 server (or a MITM on an unsigned SMB1 session) that returns the FIND_FIRST/FIND_NEXT payload; CIFSFindFirst() and cifs_filldir() use the victim\u0027s existing tcon and impose no account or capability check on that peer.\nUI:R - cifs_filldir() is reached only from cifs_dir_ops.iterate_shared (cifs_readdir) on getdents64\u2192iterate_dir; the SMB1 server cannot inject an unsolicited FIND response into that path, so a victim process must list a directory on the CIFS mount.\nS:U - The slab-out-of-bounds read in filldir64\u0027s verify_dirent_name()/memchr() stays inside the client kernel\u0027s CIFS response buffer on the same host; this is not a VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - FileNameLength can be just under PATH_MAX while de.name sits at the end of the kmalloc\u0027d FIND response, so memchr() and filldir64\u0027s unsafe_copy_dirent_name() read up to ~4095 bytes of adjacent kernel heap and copy them into the getdents64 userspace buffer.\nI:N - The defect is an over-read of the FIND entry name; cifs_filldir() does not write past the SMB buffer, and filldir64 only copies the over-read bytes to the caller\u0027s dirent buffer, giving no kernel write or control-flow primitive.\nA:H - KASAN reports a slab-out-of-bounds read in memchr() from filldir64\u2190cifs_filldir on the hostile FileNameLength; walking those bytes off the cifs_request object into an unmapped page oopses or panics the client, and the server can retrigger it on every getdents64."
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      "title": "smb: client: bound dirent name against end of SMB response in cifs_filldir",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: free inet_opt and ireq_opt after an RCU grace period\n\ntcp_v4_syn_recv_sock() transfers ownership of ireq-\u003eireq_opt to the\nchild socket (newinet-\u003einet_opt) without copying it.\n\nAnother cpu can concurrently process a retransmitted SYN for the same\nrequest socket, and send a SYNACK from tcp_check_req().\ntcp_v4_send_synack() and inet_csk_route_req() read ireq-\u003eireq_opt\nunder rcu_read_lock() only, and ip_build_and_send_pkt() and\nip_options_build() then read opt-\u003eoptlen twice.\n\nNote that the SYNACK timer itself is not an issue: it holds a\nreference on its request socket, and inet_csk_reqsk_queue_drop()\ncalls timer_delete_sync() before the child can be freed.\n\nSince commit 079096f103fa (\"tcp/dccp: install syn_recv requests\ninto ehash table\"), request sockets are processed without holding\nthe listener lock, so nothing prevents the child socket from being\nfreed while the SYNACK is still being built. TCP child sockets do\nnot have SOCK_RCU_FREE, and inet_sock_destruct() frees inet_opt\nwith a plain kfree(), leading to a use-after-free in\nip_options_build().\n\nA similar issue exists with request socket migration\n(net.ipv4.tcp_migrate_req=1, or a BPF_SK_REUSEPORT_SELECT_OR_MIGRATE\nprogram). reqsk_timer_handler() clones the request socket with\ninet_reqsk_clone(), so that the old request socket and its clone\nshare the same ireq_opt, then reqsk_migrate_reset() clears the\npointer in the old one. Another cpu holding a reference on the old\nrequest socket can still be using these options (sending a SYNACK,\nor creating a child in tcp_v4_syn_recv_sock()) when the clone is\nfreed, and tcp_v4_reqsk_destructor() also uses a plain kfree().\n\nReaders already use RCU, and other paths replacing inet_opt\n(do_ip_setsockopt(), cipso_v4_sock_setattr()...) already use\nkfree_rcu(). Use kfree_rcu() in inet_sock_destruct() and\ntcp_v4_reqsk_destructor() as well.\n\nIPv6 is not affected by the first issue, because tcp_v6_syn_recv_sock()\nduplicates the options. tcp_v6_reqsk_destructor() has the same\nmigration issue with ipv6_opt, which is only set by CALIPSO. This\nwill be addressed in a separate patch."
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              "value": "AV:N - An unauthenticated peer supplies IPv4 Record Route or Timestamp bytes in a TCP SYN; ip_rcv_options() and tcp_v4_save_options() store them in ireq_opt. Its retransmitted SYN follows tcp_v4_rcv()-\u003etcp_check_req()-\u003etcp_rtx_synack()-\u003etcp_v4_send_synack(), racing frees in patched inet_sock_destruct() or tcp_v4_reqsk_destructor().\nAC:L - On an accepting server, the peer can repeatedly create an option-bearing request and race a retransmitted SYN against completing and tearing down that same TCP connection. Both racing sides are attacker-induced; multicore scheduling and heap grooming do not constitute conditions outside the attacker\u0027s influence.\nPR:N - tcp_v4_rcv() reaches tcp_check_req() and tcp_v4_send_synack() during the TCP handshake, before application authentication. The target performs no capability or credential check on the peer\u0027s valid IPv4 Record Route or Timestamp option.\nUI:N - The peer sends the option-bearing SYN, retransmitted SYN, and handshake or teardown packets to an already listening service; no victim user must mount, open, or approve anything.\nS:U - The stale ip_options_rcu object is consumed and corrupts memory within the same host kernel in ip_build_and_send_pkt() and ip_options_build(); no separate security authority is crossed.\nC:H - After inet_sock_destruct() frees inet_opt, ip_options_build() copies opt-\u003e__data for the stale opt-\u003eoptlen into the network-bound SYNACK. Reclaiming the object can therefore disclose adjacent kernel heap contents directly to the peer.\nI:H - Reclaiming the freed ip_options_rcu lets stale optlen and srr, rr, or ts offsets steer ip_options_build() memcpy and address or timestamp writes, permitting out-of-bounds kernel writes and potential control-flow corruption.\nA:H - A reclaimed optlen can make ip_build_and_send_pkt() call skb_push() beyond the SYNACK headroom, invoking skb_under_panic(); the stale-offset writes in ip_options_build() can also oops the kernel."
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              "status": "affected",
              "version": "af2806f8f90a150160be898cd85332459c83c5cb",
              "versionType": "git"
            },
            {
              "lessThan": "d7d6ff98d5d1b400f02211f962ac32cc0020aeab",
              "status": "affected",
              "version": "af2806f8f90a150160be898cd85332459c83c5cb",
              "versionType": "git"
            },
            {
              "lessThan": "1a9c180cd8435917b7516edfb1c9148032c28773",
              "status": "affected",
              "version": "af2806f8f90a150160be898cd85332459c83c5cb",
              "versionType": "git"
            },
            {
              "lessThan": "79dc34beb1fdb3da79753e51e15c68591a2561fe",
              "status": "affected",
              "version": "af2806f8f90a150160be898cd85332459c83c5cb",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/skbuff.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.14"
            },
            {
              "lessThan": "3.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.117",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.61",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.15",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.3.*",
              "status": "unaffected",
              "version": "7.3.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.4-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.117",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.61",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.15",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3.2",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.4-rc1",
                  "versionStartIncluding": "3.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: propagate shared-frag marker in skb_zerocopy()\n\nskb_zerocopy() moves frag descriptors from @from into @to and takes a\nreference on each frag, but it does not copy skb_shinfo(from)-\u003eflags into\nskb_shinfo(to)-\u003eflags.  A destination skb holding the same page-cache\nbacked frags as the source therefore reports skb_has_shared_frag() as\nfalse.\n\nThat breaks the invariant relied on by later in-place writers.  ESP input\nchecks skb_has_shared_frag() before deciding whether an uncloned\nnonlinear skb can skip skb_cow_data(); with the marker lost, an skb that\nskb_zerocopy() built for nfnetlink_queue or for an openvswitch upcall is\ndecrypted in place, letting an unprivileged user write into the page\ncache of a root-owned read-only file.\n\nPropagate SKBFL_SHARED_FRAG when frag descriptors are copied, as done for\nthe other frag-transfer helpers."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-10T18:15:30.724Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fe8477e23dd2ee6bce231d65f2586a333b211dc0"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c623e3cbf43f12dd4a72712079bfa247a9b8ba3"
        },
        {
          "url": "https://git.kernel.org/stable/c/d7d6ff98d5d1b400f02211f962ac32cc0020aeab"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a9c180cd8435917b7516edfb1c9148032c28773"
        },
        {
          "url": "https://git.kernel.org/stable/c/79dc34beb1fdb3da79753e51e15c68591a2561fe"
        }
      ],
      "title": "net: skbuff: propagate shared-frag marker in skb_zerocopy()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99284",
    "datePublished": "2026-11-07T20:40:33.661Z",
    "dateReserved": "2026-09-25T10:25:14.405Z",
    "dateUpdated": "2026-11-10T18:15:30.724Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}