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net/sched: cls_api: remove block_cb from driver_list before freeing

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_api: remove block_cb from driver_list before freeing Error handler of tcf_block_bind() frees the whole bo->cb_list on error. However, by that time the flow_block_cb instances are already in the driver list because driver ndo_setup_tc() callback is called before that up the call chain in tcf_block_offload_cmd(). This leaves dangling pointers to freed objects in the list and causes use-after-free[0]. Fix it by also removing flow_block_cb instances from driver_list before deallocating them. [0]: [ 279.868433] ================================================================== [ 279.869964] BUG: KASAN: slab-use-after-free in flow_block_cb_setup_simple+0x631/0x7c0 [ 279.871527] Read of size 8 at addr ffff888147e2bf20 by task tc/2963 [ 279.873151] CPU: 6 PID: 2963 Comm: tc Not tainted 6.3.0-rc6+ #4 [ 279.874273] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 [ 279.876295] Call Trace: [ 279.876882] [ 279.877413] dump_stack_lvl+0x33/0x50 [ 279.878198] print_report+0xc2/0x610 [ 279.878987] ? flow_block_cb_setup_simple+0x631/0x7c0 [ 279.879994] kasan_report+0xae/0xe0 [ 279.880750] ? flow_block_cb_setup_simple+0x631/0x7c0 [ 279.881744] ? mlx5e_tc_reoffload_flows_work+0x240/0x240 [mlx5_core] [ 279.883047] flow_block_cb_setup_simple+0x631/0x7c0 [ 279.884027] tcf_block_offload_cmd.isra.0+0x189/0x2d0 [ 279.885037] ? tcf_block_setup+0x6b0/0x6b0 [

Announced Source revision 1
Original source ↗

CVE-2023-54193

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2023-54193

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
        "lessThan": "cc5fe387c6294d0471cb7ed064efac97fac65ccc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
        "lessThan": "7311c8be3755611bf6edea4dfbeb190b4bdd489f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
        "lessThan": "cb145932fcf6814e7e95e467eb70e7849a845ae9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
        "lessThan": "55866fe3fded3ce94ac3fc1bb3dfce654282f483",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
        "lessThan": "26aec72429a05e917d574eca0efc5306c63a8862",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
        "lessThan": "7b7a74ed303d532fb73ae4b1697f16a0fea89cd0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
        "lessThan": "da94a7781fc3c92e7df7832bc2746f4d39bc624e",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sched/cls_api.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.3"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.3",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.4.243",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.180",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.112",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.29",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.2.16",
        "versionType": "semver",
        "lessThanOrEqual": "6.2.*"
      },
      {
        "status": "unaffected",
        "version": "6.3.3",
        "versionType": "semver",
        "lessThanOrEqual": "6.3.*"
      },
      {
        "status": "unaffected",
        "version": "6.4",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sched/cls_api.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2023-54193

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30357 · Revision 1
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Publisher date
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