CVE-2023-52906 (GCVE-0-2023-52906)
Vulnerability from cvelistv5
Published
2024-08-21 06:10
Modified
2026-05-11 19:35
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_mpls: Fix warning during failed attribute validation The 'TCA_MPLS_LABEL' attribute is of 'NLA_U32' type, but has a validation type of 'NLA_VALIDATE_FUNCTION'. This is an invalid combination according to the comment above 'struct nla_policy': " Meaning of `validate' field, use via NLA_POLICY_VALIDATE_FN: NLA_BINARY Validation function called for the attribute. All other Unused - but note that it's a union " This can trigger the warning [1] in nla_get_range_unsigned() when validation of the attribute fails. Despite being of 'NLA_U32' type, the associated 'min'/'max' fields in the policy are negative as they are aliased by the 'validate' field. Fix by changing the attribute type to 'NLA_BINARY' which is consistent with the above comment and all other users of NLA_POLICY_VALIDATE_FN(). As a result, move the length validation to the validation function. No regressions in MPLS tests: # ./tdc.py -f tc-tests/actions/mpls.json [...] # echo $? 0 [1] WARNING: CPU: 0 PID: 17743 at lib/nlattr.c:118 nla_get_range_unsigned+0x1d8/0x1e0 lib/nlattr.c:117 Modules linked in: CPU: 0 PID: 17743 Comm: syz-executor.0 Not tainted 6.1.0-rc8 #3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014 RIP: 0010:nla_get_range_unsigned+0x1d8/0x1e0 lib/nlattr.c:117 [...] Call Trace: <TASK> __netlink_policy_dump_write_attr+0x23d/0x990 net/netlink/policy.c:310 netlink_policy_dump_write_attr+0x22/0x30 net/netlink/policy.c:411 netlink_ack_tlv_fill net/netlink/af_netlink.c:2454 [inline] netlink_ack+0x546/0x760 net/netlink/af_netlink.c:2506 netlink_rcv_skb+0x1b7/0x240 net/netlink/af_netlink.c:2546 rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:6109 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x5e9/0x6b0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x739/0x860 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0x38f/0x500 net/socket.c:2482 ___sys_sendmsg net/socket.c:2536 [inline] __sys_sendmsg+0x197/0x230 net/socket.c:2565 __do_sys_sendmsg net/socket.c:2574 [inline] __se_sys_sendmsg net/socket.c:2572 [inline] __x64_sys_sendmsg+0x42/0x50 net/socket.c:2572 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd
References
Impacted products
Vendor Product Version
Linux Linux Version: 2a2ea50870baa3fb4de0872c5b60828138654ca7
Version: 2a2ea50870baa3fb4de0872c5b60828138654ca7
Version: 2a2ea50870baa3fb4de0872c5b60828138654ca7
Version: 2a2ea50870baa3fb4de0872c5b60828138654ca7
Version: 2a2ea50870baa3fb4de0872c5b60828138654ca7
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              "content": {
                "id": "CVE-2023-52906",
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                "timestamp": "2024-09-10T16:03:11.641593Z",
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_mpls: Fix warning during failed attribute validation\n\nThe \u0027TCA_MPLS_LABEL\u0027 attribute is of \u0027NLA_U32\u0027 type, but has a\nvalidation type of \u0027NLA_VALIDATE_FUNCTION\u0027. This is an invalid\ncombination according to the comment above \u0027struct nla_policy\u0027:\n\n\"\nMeaning of `validate\u0027 field, use via NLA_POLICY_VALIDATE_FN:\n   NLA_BINARY           Validation function called for the attribute.\n   All other            Unused - but note that it\u0027s a union\n\"\n\nThis can trigger the warning [1] in nla_get_range_unsigned() when\nvalidation of the attribute fails. Despite being of \u0027NLA_U32\u0027 type, the\nassociated \u0027min\u0027/\u0027max\u0027 fields in the policy are negative as they are\naliased by the \u0027validate\u0027 field.\n\nFix by changing the attribute type to \u0027NLA_BINARY\u0027 which is consistent\nwith the above comment and all other users of NLA_POLICY_VALIDATE_FN().\nAs a result, move the length validation to the validation function.\n\nNo regressions in MPLS tests:\n\n # ./tdc.py -f tc-tests/actions/mpls.json\n [...]\n # echo $?\n 0\n\n[1]\nWARNING: CPU: 0 PID: 17743 at lib/nlattr.c:118\nnla_get_range_unsigned+0x1d8/0x1e0 lib/nlattr.c:117\nModules linked in:\nCPU: 0 PID: 17743 Comm: syz-executor.0 Not tainted 6.1.0-rc8 #3\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\nrel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014\nRIP: 0010:nla_get_range_unsigned+0x1d8/0x1e0 lib/nlattr.c:117\n[...]\nCall Trace:\n \u003cTASK\u003e\n __netlink_policy_dump_write_attr+0x23d/0x990 net/netlink/policy.c:310\n netlink_policy_dump_write_attr+0x22/0x30 net/netlink/policy.c:411\n netlink_ack_tlv_fill net/netlink/af_netlink.c:2454 [inline]\n netlink_ack+0x546/0x760 net/netlink/af_netlink.c:2506\n netlink_rcv_skb+0x1b7/0x240 net/netlink/af_netlink.c:2546\n rtnetlink_rcv+0x18/0x20 net/core/rtnetlink.c:6109\n netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]\n netlink_unicast+0x5e9/0x6b0 net/netlink/af_netlink.c:1345\n netlink_sendmsg+0x739/0x860 net/netlink/af_netlink.c:1921\n sock_sendmsg_nosec net/socket.c:714 [inline]\n sock_sendmsg net/socket.c:734 [inline]\n ____sys_sendmsg+0x38f/0x500 net/socket.c:2482\n ___sys_sendmsg net/socket.c:2536 [inline]\n __sys_sendmsg+0x197/0x230 net/socket.c:2565\n __do_sys_sendmsg net/socket.c:2574 [inline]\n __se_sys_sendmsg net/socket.c:2572 [inline]\n __x64_sys_sendmsg+0x42/0x50 net/socket.c:2572\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd"
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      "providerMetadata": {
        "dateUpdated": "2026-05-11T19:35:16.748Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2b157c3c5d6b8ddca48d53c9e662032f65af8d61"
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        {
          "url": "https://git.kernel.org/stable/c/453277feb41c2235cf2c0de9209eef962c401457"
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        {
          "url": "https://git.kernel.org/stable/c/9e2c38827cdc6fdd3bb375c8607fc04d289756f9"
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        {
          "url": "https://git.kernel.org/stable/c/8a97b544b98e44f596219ebb290fd2ba2fd5d644"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e17f99220d111ea031b44153fdfe364b0024ff2"
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      "title": "net/sched: act_mpls: Fix warning during failed attribute validation",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-52906",
    "datePublished": "2024-08-21T06:10:47.121Z",
    "dateReserved": "2024-08-21T06:07:11.015Z",
    "dateUpdated": "2026-05-11T19:35:16.748Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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