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net/sched: teql: Fix double-free in teql_master_xmit

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net/sched: teql: Fix double-free in teql_master_xmit Whenever a TEQL devices has a lockless Qdisc as root, qdisc_reset should be called using the seq_lock to avoid racing with the datapath. Failure to do so may cause crashes like the following: [ 238.028993][ T318] BUG: KASAN: double-free in skb_release_data (net/core/skbuff.c:1139) [ 238.029328][ T318] Free of addr ffff88810c67ec00 by task poc_teql_uaf_ke/318 [ 238.029749][ T318] [ 238.029900][ T318] CPU: 3 UID: 0 PID: 318 Comm: poc_teql_ke Not tainted 7.0.0-rc3-00149-ge5b31d988a41 #704 PREEMPT(full) [ 238.029906][ T318] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 238.029910][ T318] Call Trace: [ 238.029913][ T318] [ 238.029916][ T318] dump_stack_lvl (lib/dump_stack.c:122) [ 238.029928][ T318] print_report (mm/kasan/report.c:379 mm/kasan/report.c:482) [ 238.029940][ T318] ? skb_release_data (net/core/skbuff.c:1139) [ 238.029944][ T318] ? srso_alias_return_thunk (arch/x86/lib/retpoline.S:221) ... [ 238.029957][ T318] ? skb_release_data (net/core/skbuff.c:1139) [ 238.029969][ T318] kasan_report_invalid_free (mm/kasan/report.c:221 mm/kasan/report.c:563) [ 238.029979][ T318] ? skb_release_data (net/core/skbuff.c:1139) [ 238.029989][ T318] check_slab_allocation (mm/kasan/common.c:231) [ 238.029995][ T318] kmem_cache_free (mm/slub.c:2637 (discriminator 1) mm/slub.c:6168 (discriminator 1) mm/slub.c:6298 (discriminator 1)) [ 238.030004][ T318] skb_release_da

Announced Source revision 1
Original source ↗

CVE-2026-23449

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-2026-23449

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": "96009c7d500efdd5534e83b2e3eb2c58d4b137ae",
        "lessThan": "4e8ebc4c18ea8213d28e6cb867d18fcc67daca21",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "96009c7d500efdd5534e83b2e3eb2c58d4b137ae",
        "lessThan": "21c89a0a8de7eadad8d385645a95b3233f23130e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "96009c7d500efdd5534e83b2e3eb2c58d4b137ae",
        "lessThan": "afbc79a7770b230a9f24bd39271209d6b3682c5f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "96009c7d500efdd5534e83b2e3eb2c58d4b137ae",
        "lessThan": "e9c66d3e7d8557b3308e55c613aa07254fe97611",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "96009c7d500efdd5534e83b2e3eb2c58d4b137ae",
        "lessThan": "4a233447b941db451ea5f5a0942cffd0f7f7eaae",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "96009c7d500efdd5534e83b2e3eb2c58d4b137ae",
        "lessThan": "66360460cab63c248ca5b1070a01c0c29133b960",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "include/net/sch_generic.h",
      "net/sched/sch_generic.c",
      "net/sched/sch_teql.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.18"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.18",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.167",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.130",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.78",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.20",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.10",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/net/sch_generic.h",
      "net/sched/sch_generic.c",
      "net/sched/sch_teql.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-23449

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#39854 · Revision 1
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Publisher date
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