{"id":"CVE-2026-31510","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-31510","generatedAt":"2026-10-28T03:42:15.945Z","title":"In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix null-ptr-deref on l2cap_sock_ready_cb Before using sk pointer, check if it is null.","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix null-ptr-deref on l2cap_sock_ready_cb\n\nBefore using sk pointer, check if it is null.\n\nFix the following:\n\n KASAN: null-ptr-deref in range [0x0000000000000260-0x0000000000000267]\n CPU: 0 UID: 0 PID: 5985 Comm: kworker/0:5 Not tainted 7.0.0-rc4-00029-ga989fde763f4 #1 PREEMPT(full)\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.17.0-9.fc43 06/10/2025\n Workqueue: events l2cap_info_timeout\n RIP: 0010:kasan_byte_accessible+0x12/0x30\n Code: 79 ff ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 c3 cc cce\n veth0_macvtap: entered promiscuous mode\n RSP: 0018:ffffc90006e0f808 EFLAGS: 00010202\n RAX: dffffc0000000000 RBX: ffffffff89746018 RCX: 0000000080000001\n RDX: 0000000000000000 RSI: ffffffff89746018 RDI: 000000000000004c\n RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000\n R10: dffffc0000000000 R11: ffffffff8aae3e70 R12: 0000000000000000\n R13: 0000000000000260 R14: 0000000000000260 R15: 0000000000000001\n FS:  0000000000000000(0000) GS:ffff8880983c2000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00005582615a5008 CR3: 000000007007e000 CR4: 0000000000752ef0\n PKRU: 55555554\n Call Trace:\n  <TASK>\n  __kasan_check_byte+0x12/0x40\n  lock_acquire+0x79/0x2e0\n  lock_sock_nested+0x48/0x100\n  ? l2cap_sock_ready_cb+0x46/0x160\n  l2cap_sock_ready_cb+0x46/0x160\n  l2cap_conn_start+0x779/0xff0\n  ? __pfx_l2cap_conn_start+0x10/0x10\n  ? l2cap_info_timeout+0x60/0xa0\n  ? __pfx___mutex_lock+0x10/0x10\n  l2cap_info_timeout+0x68/0xa0\n  ? process_scheduled_works+0xa8d/0x18c0\n  process_scheduled_works+0xb6e/0x18c0\n  ? __pfx_process_scheduled_works+0x10/0x10\n  ? assign_work+0x3d5/0x5e0\n  worker_thread+0xa53/0xfc0\n  kthread+0x388/0x470\n  ? __pfx_worker_thread+0x10/0x10\n  ? __pfx_kthread+0x10/0x10\n  ret_from_fork+0x51e/0xb90\n  ? __pfx_ret_from_fork+0x10/0x10\n veth1_macvtap: entered promiscuous mode\n  ? __switch_to+0xc7d/0x1450\n  ? __pfx_kthread+0x10/0x10\n  ret_from_fork_asm+0x1a/0x30\n  </TASK>\n Modules linked in:\n ---[ end trace 0000000000000000 ]---\n batman_adv: batadv0: Interface activated: batadv_slave_0\n batman_adv: batadv0: Interface activated: batadv_slave_1\n netdevsim netdevsim7 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0\n netdevsim netdevsim7 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0\n netdevsim netdevsim7 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0\n netdevsim netdevsim7 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0\n RIP: 0010:kasan_byte_accessible+0x12/0x30\n Code: 79 ff ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 c3 cc cce\n ieee80211 phy39: Selected rate control algorithm 'minstrel_ht'\n RSP: 0018:ffffc90006e0f808 EFLAGS: 00010202\n RAX: dffffc0000000000 RBX: ffffffff89746018 RCX: 0000000080000001\n RDX: 0000000000000000 RSI: ffffffff89746018 RDI: 000000000000004c\n RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000\n R10: dffffc0000000000 R11: ffffffff8aae3e70 R12: 0000000000000000\n R13: 0000000000000260 R14: 0000000000000260 R15: 0000000000000001\n FS:  0000000000000000(0000) GS:ffff8880983c2000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f7e16139e9c CR3: 000000000e74e000 CR4: 0000000000752ef0\n PKRU: 55555554\n Kernel panic - not syncing: Fatal exception","published":"2026-04-22T14:16:50.000Z","lastModified":"2026-06-17T10:33:53.000Z","status":"Analyzed","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","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"},"cwe":["CWE-476"],"affected":["linux/linux kernel"],"epss":{"score":0.00123,"percentile":0.02025,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.12%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/03d4eafb0f3788239df63575951f6b4c97bbfda4","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0780f9333852971ca77d110019e3a66ce5a7b100","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1dc6db047919ecd59493cd51248b37381bbabcbb","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3c821bc0fbeaa27910a20d0b43c6008d099792af","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/898b89c90ff9496e64b9331040778cc4e1b28c9d","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a04a760c06bb591989db659439efdf106f0bae76","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b6552e0503973daf6f23bd6ed9273ef131ee364f","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d34776c7fa1f2c510f1cdd14823aba701babb4ad","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31510","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}