CVE-2026-52941 (GCVE-0-2026-52941)

Vulnerability from cvelistv5 – Published: 2026-06-24 07:14 – Updated: 2026-06-24 07:14
VLAI
Title
net/smc: avoid NULL deref of conn->lnk in smc_msg_event tracepoint
Summary
In the Linux kernel, the following vulnerability has been resolved: net/smc: avoid NULL deref of conn->lnk in smc_msg_event tracepoint The smc_msg_event tracepoint class, shared by smc_tx_sendmsg and smc_rx_recvmsg, unconditionally dereferences smc->conn.lnk: __string(name, smc->conn.lnk->ibname) conn->lnk is only set for SMC-R; for SMC-D it is NULL. Other code on these paths already handles this (e.g. !conn->lnk in SMC_STAT_RMB_TX_SIZE_SMALL()). With the tracepoint enabled, the first sendmsg()/recvmsg() on an SMC-D socket crashes: Oops: general protection fault, probably for non-canonical address KASAN: null-ptr-deref in range [...] RIP: 0010:strlen+0x1e/0xa0 Call Trace: trace_event_raw_event_smc_msg_event (net/smc/smc_tracepoint.h:44) smc_rx_recvmsg (net/smc/smc_rx.c:515) smc_recvmsg (net/smc/af_smc.c:2859) __sys_recvfrom (net/socket.c:2315) __x64_sys_recvfrom (net/socket.c:2326) do_syscall_64 The faulting address 0x3e0 is offsetof(struct smc_link, ibname), confirming the NULL ->lnk deref. Enabling the tracepoint requires root, but the trigger itself is unprivileged: socket(AF_SMC, ...) has no capability check, and SMC-D negotiation needs no admin step on s390 or on x86 with the loopback ISM device loaded. Log an empty device name for SMC-D instead of dereferencing NULL.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 , < 68200112534bb2acd1d7117dc2d5c124868d866d (git)
Affected: aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 , < 720c76b930c52cd58f50eb6b10569d03dccc7959 (git)
Affected: aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 , < b706d6d76a2a2793fe5ad0fbc2a75b6a460094ef (git)
Affected: aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 , < d2ea0b8aef8746e147602eac87ca8538f4bc7e66 (git)
Affected: aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 , < 561cf66fa9b6c86dfe4e687d2d1aeaaa6739917f (git)
Affected: aff3083f10bff7a37eaa2b4e6bc5fb627ddd5f84 , < 7bf563badd37cb796df5477d2b78bb64148a1268 (git)
Create a notification for this product.
Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: avoid NULL deref of conn-\u003elnk in smc_msg_event tracepoint\n\nThe smc_msg_event tracepoint class, shared by smc_tx_sendmsg and\nsmc_rx_recvmsg, unconditionally dereferences smc-\u003econn.lnk:\n\n\t__string(name, smc-\u003econn.lnk-\u003eibname)\n\nconn-\u003elnk is only set for SMC-R; for SMC-D it is NULL. Other code on\nthese paths already handles this (e.g. !conn-\u003elnk in\nSMC_STAT_RMB_TX_SIZE_SMALL()). With the tracepoint enabled, the first\nsendmsg()/recvmsg() on an SMC-D socket crashes:\n\n  Oops: general protection fault, probably for non-canonical address\n  KASAN: null-ptr-deref in range [...]\n  RIP: 0010:strlen+0x1e/0xa0\n  Call Trace:\n   trace_event_raw_event_smc_msg_event (net/smc/smc_tracepoint.h:44)\n   smc_rx_recvmsg (net/smc/smc_rx.c:515)\n   smc_recvmsg (net/smc/af_smc.c:2859)\n   __sys_recvfrom (net/socket.c:2315)\n   __x64_sys_recvfrom (net/socket.c:2326)\n   do_syscall_64\n\nThe faulting address 0x3e0 is offsetof(struct smc_link, ibname),\nconfirming the NULL -\u003elnk deref. Enabling the tracepoint requires\nroot, but the trigger itself is unprivileged: socket(AF_SMC, ...) has\nno capability check, and SMC-D negotiation needs no admin step on\ns390 or on x86 with the loopback ISM device loaded.\n\nLog an empty device name for SMC-D instead of dereferencing NULL."
        }
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        "dateUpdated": "2026-06-24T07:14:29.943Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "dateReserved": "2026-06-09T07:44:35.370Z",
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      "version": "2"
    },
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With the tracepoint enabled, the first\\nsendmsg()/recvmsg() on an SMC-D socket crashes:\\n\\n  Oops: general protection fault, probably for non-canonical address\\n  KASAN: null-ptr-deref in range [...]\\n  RIP: 0010:strlen+0x1e/0xa0\\n  Call Trace:\\n   trace_event_raw_event_smc_msg_event (net/smc/smc_tracepoint.h:44)\\n   smc_rx_recvmsg (net/smc/smc_rx.c:515)\\n   smc_recvmsg (net/smc/af_smc.c:2859)\\n   __sys_recvfrom (net/socket.c:2315)\\n   __x64_sys_recvfrom (net/socket.c:2326)\\n   do_syscall_64\\n\\nThe faulting address 0x3e0 is offsetof(struct smc_link, ibname),\\nconfirming the NULL -\u003elnk deref. Enabling the tracepoint requires\\nroot, but the trigger itself is unprivileged: socket(AF_SMC, ...) has\\nno capability check, and SMC-D negotiation needs no admin step on\\ns390 or on x86 with the loopback ISM device loaded.\\n\\nLog an empty device name for SMC-D instead of dereferencing 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-08T19:29:06+00:00",
      "cve": "CVE-2026-52941",
      "id": "CVE-2026-52941",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/smc: avoid NULL deref of conn-\u003elnk in smc_msg_event tracepoint",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52941.json",
      "version": "3"
    }
  }
}



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