{"api_version":"1","generated_at":"2026-05-13T02:24:19+00:00","cve":"CVE-2026-31551","urls":{"html":"https://cve.report/CVE-2026-31551","api":"https://cve.report/api/cve/CVE-2026-31551.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31551","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31551"},"summary":{"title":"wifi: mac80211: Fix static_branch_dec() underflow for aql_disable.","description":"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(&aql_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's 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 <0f> 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 <TASK>\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 <48> 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 </TASK>","state":"PUBLISHED","assigner":"Linux","published_at":"2026-04-24 15:16:29","updated_at":"2026-04-27 20:15:30"},"problem_types":["CWE-191"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}}],"references":[{"url":"https://git.kernel.org/stable/c/8bb90ff77326c34e75b573b1febdd9586fec5aba","name":"https://git.kernel.org/stable/c/8bb90ff77326c34e75b573b1febdd9586fec5aba","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5ba05436f15d16ae7ab04b880e8bf8d440be892b","name":"https://git.kernel.org/stable/c/5ba05436f15d16ae7ab04b880e8bf8d440be892b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/256f7d4c11235d0569f78413c41dc89d2dc1557c","name":"https://git.kernel.org/stable/c/256f7d4c11235d0569f78413c41dc89d2dc1557c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b94ae8e0d5fe1bdbbfdc3854ff6ce98f6876a828","name":"https://git.kernel.org/stable/c/b94ae8e0d5fe1bdbbfdc3854ff6ce98f6876a828","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/29a1a350afcd28a2150bd73b8bd83eac3480f13e","name":"https://git.kernel.org/stable/c/29a1a350afcd28a2150bd73b8bd83eac3480f13e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/787152497ac763deab16f6f4b7ce79aaeb3eb7e8","name":"https://git.kernel.org/stable/c/787152497ac763deab16f6f4b7ce79aaeb3eb7e8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b24763d32d5b4ada766deca4b42d6766272fef0c","name":"https://git.kernel.org/stable/c/b24763d32d5b4ada766deca4b42d6766272fef0c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31551","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31551","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e908435e402aff23c9b0b3c59c7cd12b08b681b0 787152497ac763deab16f6f4b7ce79aaeb3eb7e8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e908435e402aff23c9b0b3c59c7cd12b08b681b0 8bb90ff77326c34e75b573b1febdd9586fec5aba git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e908435e402aff23c9b0b3c59c7cd12b08b681b0 256f7d4c11235d0569f78413c41dc89d2dc1557c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e908435e402aff23c9b0b3c59c7cd12b08b681b0 29a1a350afcd28a2150bd73b8bd83eac3480f13e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e908435e402aff23c9b0b3c59c7cd12b08b681b0 5ba05436f15d16ae7ab04b880e8bf8d440be892b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e908435e402aff23c9b0b3c59c7cd12b08b681b0 b24763d32d5b4ada766deca4b42d6766272fef0c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e908435e402aff23c9b0b3c59c7cd12b08b681b0 b94ae8e0d5fe1bdbbfdc3854ff6ce98f6876a828 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.12","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.12 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.203 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.167 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.130 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.78 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.20 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.10 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2026","cve_id":"31551","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"31551","cve":"CVE-2026-31551","epss":"0.000240000","percentile":"0.067850000","score_date":"2026-04-27","updated_at":"2026-04-28 00:06:44"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/mac80211/debugfs.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"787152497ac763deab16f6f4b7ce79aaeb3eb7e8","status":"affected","version":"e908435e402aff23c9b0b3c59c7cd12b08b681b0","versionType":"git"},{"lessThan":"8bb90ff77326c34e75b573b1febdd9586fec5aba","status":"affected","version":"e908435e402aff23c9b0b3c59c7cd12b08b681b0","versionType":"git"},{"lessThan":"256f7d4c11235d0569f78413c41dc89d2dc1557c","status":"affected","version":"e908435e402aff23c9b0b3c59c7cd12b08b681b0","versionType":"git"},{"lessThan":"29a1a350afcd28a2150bd73b8bd83eac3480f13e","status":"affected","version":"e908435e402aff23c9b0b3c59c7cd12b08b681b0","versionType":"git"},{"lessThan":"5ba05436f15d16ae7ab04b880e8bf8d440be892b","status":"affected","version":"e908435e402aff23c9b0b3c59c7cd12b08b681b0","versionType":"git"},{"lessThan":"b24763d32d5b4ada766deca4b42d6766272fef0c","status":"affected","version":"e908435e402aff23c9b0b3c59c7cd12b08b681b0","versionType":"git"},{"lessThan":"b94ae8e0d5fe1bdbbfdc3854ff6ce98f6876a828","status":"affected","version":"e908435e402aff23c9b0b3c59c7cd12b08b681b0","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/mac80211/debugfs.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.12"},{"lessThan":"5.12","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"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},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.167","versionStartIncluding":"5.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.130","versionStartIncluding":"5.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.78","versionStartIncluding":"5.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.20","versionStartIncluding":"5.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.10","versionStartIncluding":"5.12","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"5.12","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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(&aql_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's 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 <0f> 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 <TASK>\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 <48> 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 </TASK>"}],"providerMetadata":{"dateUpdated":"2026-04-24T14:33:18.230Z","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":"2026-04-24T14:33:18.230Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-24 15:16:29","lastModifiedDate":"2026-04-27 20:15:30","problem_types":["CWE-191"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12.1","versionEndExcluding":"5.15.203","matchCriteriaId":"AA3D6441-4F2E-41AB-A26D-388B03A5932F"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.167","matchCriteriaId":"2EDC6BAF-B710-4E26-B6AA-D68922EE7B43"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.130","matchCriteriaId":"C57BB918-DF28-46B3-94F7-144176841267"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.78","matchCriteriaId":"28D591F5-B196-4CC9-905C-DC80F116E7A8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.20","matchCriteriaId":"E5571059-6552-48E7-9BEF-3E358C387171"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"6.19.10","matchCriteriaId":"96D34333-38BE-4414-9E79-6EB764329581"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:5.12:-:*:*:*:*:*:*","matchCriteriaId":"75EB504D-4A83-4C67-9C8D-FD9C6C8EB4CD"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*","matchCriteriaId":"F253B622-8837-4245-BCE5-A7BF8FC76A16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*","matchCriteriaId":"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*","matchCriteriaId":"F666C8D8-6538-46D4-B318-87610DE64C34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*","matchCriteriaId":"02259FDA-961B-47BC-AE7F-93D7EC6E90C2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*","matchCriteriaId":"58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*","matchCriteriaId":"1D2315C0-D46F-4F85-9754-F9E5E11374A6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*","matchCriteriaId":"512EE3A8-A590-4501-9A94-5D4B268D6138"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31551","Ordinal":"1","Title":"wifi: mac80211: Fix static_branch_dec() underflow for aql_disabl","CVE":"CVE-2026-31551","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31551","Ordinal":"1","NoteData":"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(&aql_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's 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 <0f> 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 <TASK>\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 <48> 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 </TASK>","Type":"Description","Title":"wifi: mac80211: Fix static_branch_dec() underflow for aql_disabl"}]}}}