CVE-2026-31551 (GCVE-0-2026-31551)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:33 – Updated: 2026-05-11 22:10
VLAI
Title
wifi: mac80211: Fix static_branch_dec() underflow for aql_disable.
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: Fix static_branch_dec() underflow for aql_disable. syzbot reported static_branch_dec() underflow in aql_enable_write(). [0] The problem is that aql_enable_write() does not serialise concurrent write()s to the debugfs. aql_enable_write() checks static_key_false(&aql_disable.key) and later calls static_branch_inc() or static_branch_dec(), but the state may change between the two calls. aql_disable does not need to track inc/dec. Let's use static_branch_enable() and static_branch_disable(). [0]: val == 0 WARNING: kernel/jump_label.c:311 at __static_key_slow_dec_cpuslocked.part.0+0x107/0x120 kernel/jump_label.c:311, CPU#0: syz.1.3155/20288 Modules linked in: CPU: 0 UID: 0 PID: 20288 Comm: syz.1.3155 Tainted: G U L syzkaller #0 PREEMPT(full) Tainted: [U]=USER, [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:__static_key_slow_dec_cpuslocked.part.0+0x107/0x120 kernel/jump_label.c:311 Code: f2 c9 ff 5b 5d c3 cc cc cc cc e8 54 f2 c9 ff 48 89 df e8 ac f9 ff ff eb ad e8 45 f2 c9 ff 90 0f 0b 90 eb a2 e8 3a f2 c9 ff 90 <0f> 0b 90 eb 97 48 89 df e8 5c 4b 33 00 e9 36 ff ff ff 0f 1f 80 00 RSP: 0018:ffffc9000b9f7c10 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffffff9b3e5d40 RCX: ffffffff823c57b4 RDX: ffff8880285a0000 RSI: ffffffff823c5846 RDI: ffff8880285a0000 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000000a R13: 1ffff9200173ef88 R14: 0000000000000001 R15: ffffc9000b9f7e98 FS: 00007f530dd726c0(0000) GS:ffff8881245e3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001140 CR3: 000000007cc4a000 CR4: 00000000003526f0 Call Trace: <TASK> __static_key_slow_dec_cpuslocked kernel/jump_label.c:297 [inline] __static_key_slow_dec kernel/jump_label.c:321 [inline] static_key_slow_dec+0x7c/0xc0 kernel/jump_label.c:336 aql_enable_write+0x2b2/0x310 net/mac80211/debugfs.c:343 short_proxy_write+0x133/0x1a0 fs/debugfs/file.c:383 vfs_write+0x2aa/0x1070 fs/read_write.c:684 ksys_pwrite64 fs/read_write.c:793 [inline] __do_sys_pwrite64 fs/read_write.c:801 [inline] __se_sys_pwrite64 fs/read_write.c:798 [inline] __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:798 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f530cf9aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f530dd72028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007f530d215fa0 RCX: 00007f530cf9aeb9 RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000010 RBP: 00007f530d008c1f R08: 0000000000000000 R09: 0000000000000000 R10: 4200000000000005 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f530d216038 R14: 00007f530d215fa0 R15: 00007ffde89fb978 </TASK>
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e908435e402aff23c9b0b3c59c7cd12b08b681b0 , < 787152497ac763deab16f6f4b7ce79aaeb3eb7e8 (git)
Affected: e908435e402aff23c9b0b3c59c7cd12b08b681b0 , < 8bb90ff77326c34e75b573b1febdd9586fec5aba (git)
Affected: e908435e402aff23c9b0b3c59c7cd12b08b681b0 , < 256f7d4c11235d0569f78413c41dc89d2dc1557c (git)
Affected: e908435e402aff23c9b0b3c59c7cd12b08b681b0 , < 29a1a350afcd28a2150bd73b8bd83eac3480f13e (git)
Affected: e908435e402aff23c9b0b3c59c7cd12b08b681b0 , < 5ba05436f15d16ae7ab04b880e8bf8d440be892b (git)
Affected: e908435e402aff23c9b0b3c59c7cd12b08b681b0 , < b24763d32d5b4ada766deca4b42d6766272fef0c (git)
Affected: e908435e402aff23c9b0b3c59c7cd12b08b681b0 , < b94ae8e0d5fe1bdbbfdc3854ff6ce98f6876a828 (git)
Create a notification for this product.
Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/debugfs.c"
          ],
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          "vendor": "Linux",
          "versions": [
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          "programFiles": [
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          "vendor": "Linux",
          "versions": [
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              "version": "5.12"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "version": "5.15.203",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.20",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.1.167",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.6.130",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.78",
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                },
                {
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                  "versionEndExcluding": "6.18.20",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.0",
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                }
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              "negate": false,
              "operator": "OR"
            }
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: Fix static_branch_dec() underflow for aql_disable.\n\nsyzbot reported static_branch_dec() underflow in aql_enable_write(). [0]\n\nThe problem is that aql_enable_write() does not serialise concurrent\nwrite()s to the debugfs.\n\naql_enable_write() checks static_key_false(\u0026aql_disable.key) and\nlater calls static_branch_inc() or static_branch_dec(), but the\nstate may change between the two calls.\n\naql_disable does not need to track inc/dec.\n\nLet\u0027s use static_branch_enable() and static_branch_disable().\n\n[0]:\nval == 0\nWARNING: kernel/jump_label.c:311 at __static_key_slow_dec_cpuslocked.part.0+0x107/0x120 kernel/jump_label.c:311, CPU#0: syz.1.3155/20288\nModules linked in:\nCPU: 0 UID: 0 PID: 20288 Comm: syz.1.3155 Tainted: G     U       L      syzkaller #0 PREEMPT(full)\nTainted: [U]=USER, [L]=SOFTLOCKUP\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026\nRIP: 0010:__static_key_slow_dec_cpuslocked.part.0+0x107/0x120 kernel/jump_label.c:311\nCode: f2 c9 ff 5b 5d c3 cc cc cc cc e8 54 f2 c9 ff 48 89 df e8 ac f9 ff ff eb ad e8 45 f2 c9 ff 90 0f 0b 90 eb a2 e8 3a f2 c9 ff 90 \u003c0f\u003e 0b 90 eb 97 48 89 df e8 5c 4b 33 00 e9 36 ff ff ff 0f 1f 80 00\nRSP: 0018:ffffc9000b9f7c10 EFLAGS: 00010293\nRAX: 0000000000000000 RBX: ffffffff9b3e5d40 RCX: ffffffff823c57b4\nRDX: ffff8880285a0000 RSI: ffffffff823c5846 RDI: ffff8880285a0000\nRBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000000 R12: 000000000000000a\nR13: 1ffff9200173ef88 R14: 0000000000000001 R15: ffffc9000b9f7e98\nFS:  00007f530dd726c0(0000) GS:ffff8881245e3000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000200000001140 CR3: 000000007cc4a000 CR4: 00000000003526f0\nCall Trace:\n \u003cTASK\u003e\n __static_key_slow_dec_cpuslocked kernel/jump_label.c:297 [inline]\n __static_key_slow_dec kernel/jump_label.c:321 [inline]\n static_key_slow_dec+0x7c/0xc0 kernel/jump_label.c:336\n aql_enable_write+0x2b2/0x310 net/mac80211/debugfs.c:343\n short_proxy_write+0x133/0x1a0 fs/debugfs/file.c:383\n vfs_write+0x2aa/0x1070 fs/read_write.c:684\n ksys_pwrite64 fs/read_write.c:793 [inline]\n __do_sys_pwrite64 fs/read_write.c:801 [inline]\n __se_sys_pwrite64 fs/read_write.c:798 [inline]\n __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:798\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f530cf9aeb9\nCode: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f530dd72028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012\nRAX: ffffffffffffffda RBX: 00007f530d215fa0 RCX: 00007f530cf9aeb9\nRDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000010\nRBP: 00007f530d008c1f R08: 0000000000000000 R09: 0000000000000000\nR10: 4200000000000005 R11: 0000000000000246 R12: 0000000000000000\nR13: 00007f530d216038 R14: 00007f530d215fa0 R15: 00007ffde89fb978\n \u003c/TASK\u003e"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:10:57.880Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/787152497ac763deab16f6f4b7ce79aaeb3eb7e8"
        },
        {
          "url": "https://git.kernel.org/stable/c/8bb90ff77326c34e75b573b1febdd9586fec5aba"
        },
        {
          "url": "https://git.kernel.org/stable/c/256f7d4c11235d0569f78413c41dc89d2dc1557c"
        },
        {
          "url": "https://git.kernel.org/stable/c/29a1a350afcd28a2150bd73b8bd83eac3480f13e"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ba05436f15d16ae7ab04b880e8bf8d440be892b"
        },
        {
          "url": "https://git.kernel.org/stable/c/b24763d32d5b4ada766deca4b42d6766272fef0c"
        },
        {
          "url": "https://git.kernel.org/stable/c/b94ae8e0d5fe1bdbbfdc3854ff6ce98f6876a828"
        }
      ],
      "title": "wifi: mac80211: Fix static_branch_dec() underflow for aql_disable.",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31551",
    "datePublished": "2026-04-24T14:33:18.230Z",
    "dateReserved": "2026-03-09T15:48:24.115Z",
    "dateUpdated": "2026-05-11T22:10:57.880Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-31551",
      "date": "2026-05-25",
      "epss": "0.00013",
      "percentile": "0.02387"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31551\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-24T15:16:29.350\",\"lastModified\":\"2026-04-27T20:15:30.593\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nwifi: mac80211: Fix static_branch_dec() underflow for aql_disable.\\n\\nsyzbot reported static_branch_dec() underflow in aql_enable_write(). [0]\\n\\nThe problem is that aql_enable_write() does not serialise concurrent\\nwrite()s to the debugfs.\\n\\naql_enable_write() checks static_key_false(\u0026aql_disable.key) and\\nlater calls static_branch_inc() or static_branch_dec(), but the\\nstate may change between the two calls.\\n\\naql_disable does not need to track inc/dec.\\n\\nLet\u0027s use static_branch_enable() and static_branch_disable().\\n\\n[0]:\\nval == 0\\nWARNING: kernel/jump_label.c:311 at __static_key_slow_dec_cpuslocked.part.0+0x107/0x120 kernel/jump_label.c:311, CPU#0: syz.1.3155/20288\\nModules linked in:\\nCPU: 0 UID: 0 PID: 20288 Comm: syz.1.3155 Tainted: G     U       L      syzkaller #0 PREEMPT(full)\\nTainted: [U]=USER, [L]=SOFTLOCKUP\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026\\nRIP: 0010:__static_key_slow_dec_cpuslocked.part.0+0x107/0x120 kernel/jump_label.c:311\\nCode: f2 c9 ff 5b 5d c3 cc cc cc cc e8 54 f2 c9 ff 48 89 df e8 ac f9 ff ff eb ad e8 45 f2 c9 ff 90 0f 0b 90 eb a2 e8 3a f2 c9 ff 90 \u003c0f\u003e 0b 90 eb 97 48 89 df e8 5c 4b 33 00 e9 36 ff ff ff 0f 1f 80 00\\nRSP: 0018:ffffc9000b9f7c10 EFLAGS: 00010293\\nRAX: 0000000000000000 RBX: ffffffff9b3e5d40 RCX: ffffffff823c57b4\\nRDX: ffff8880285a0000 RSI: ffffffff823c5846 RDI: ffff8880285a0000\\nRBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000\\nR10: 0000000000000000 R11: 0000000000000000 R12: 000000000000000a\\nR13: 1ffff9200173ef88 R14: 0000000000000001 R15: ffffc9000b9f7e98\\nFS:  00007f530dd726c0(0000) GS:ffff8881245e3000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 0000200000001140 CR3: 000000007cc4a000 CR4: 00000000003526f0\\nCall Trace:\\n \u003cTASK\u003e\\n __static_key_slow_dec_cpuslocked kernel/jump_label.c:297 [inline]\\n __static_key_slow_dec kernel/jump_label.c:321 [inline]\\n static_key_slow_dec+0x7c/0xc0 kernel/jump_label.c:336\\n aql_enable_write+0x2b2/0x310 net/mac80211/debugfs.c:343\\n short_proxy_write+0x133/0x1a0 fs/debugfs/file.c:383\\n vfs_write+0x2aa/0x1070 fs/read_write.c:684\\n ksys_pwrite64 fs/read_write.c:793 [inline]\\n __do_sys_pwrite64 fs/read_write.c:801 [inline]\\n __se_sys_pwrite64 fs/read_write.c:798 [inline]\\n __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:798\\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\\n do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94\\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\\nRIP: 0033:0x7f530cf9aeb9\\nCode: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48\\nRSP: 002b:00007f530dd72028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012\\nRAX: ffffffffffffffda RBX: 00007f530d215fa0 RCX: 00007f530cf9aeb9\\nRDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000010\\nRBP: 00007f530d008c1f R08: 0000000000000000 R09: 0000000000000000\\nR10: 4200000000000005 R11: 0000000000000246 R12: 0000000000000000\\nR13: 00007f530d216038 R14: 00007f530d215fa0 R15: 00007ffde89fb978\\n 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  }
}


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Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.