CVE-2024-38544 RDMA/rxe: Fix seg fault in rxe_comp_queue_pkt

2024-06-1913:35:18

Linux

www.cve.org

linux kernel

vulnerability

rdma

rxe_comp_queue_pkt

seg fault

skb

completer task

performance counter

0.0004 Low

EPSS

Percentile

15.8%

JSON

In the Linux kernel, the following vulnerability has been resolved:

RDMA/rxe: Fix seg fault in rxe_comp_queue_pkt

In rxe_comp_queue_pkt() an incoming response packet skb is enqueued to the
resp_pkts queue and then a decision is made whether to run the completer
task inline or schedule it. Finally the skb is dereferenced to bump a ‘hw’
performance counter. This is wrong because if the completer task is
already running in a separate thread it may have already processed the skb
and freed it which can cause a seg fault. This has been observed
infrequently in testing at high scale.

This patch fixes this by changing the order of enqueuing the packet until
after the counter is accessed.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/infiniband/sw/rxe/rxe_comp.c"
    ],
    "versions": [
      {
        "version": "0b1e5b99a48b",
        "lessThan": "faa8d0ecf6c9",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "0b1e5b99a48b",
        "lessThan": "21b4c6d4d890",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "0b1e5b99a48b",
        "lessThan": "bbad88f111a1",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "0b1e5b99a48b",
        "lessThan": "30df4bef8b8e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "0b1e5b99a48b",
        "lessThan": "2b23b6097303",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/infiniband/sw/rxe/rxe_comp.c"
    ],
    "versions": [
      {
        "version": "4.12",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.12",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.93",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.33",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.12",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9.3",
        "lessThanOrEqual": "6.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10-rc1",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]