Skip to content
CVE PROGRAM SOURCE RECORD7.1 High

CVE-2026-64403

Bluetooth: L2CAP: validate option length before reading conf opt value

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: validate option length before reading conf opt value l2cap_get_conf_opt() derives the option length from the attacker-controlled opt->len field and immediately dereferences opt->val (as u8, get_unaligned_le16() or get_unaligned_le32(), or a raw pointer for the default case) before any caller has confirmed that opt->len bytes are present in the buffer. The callers (l2cap_parse_conf_req(), l2cap_parse_conf_rsp() and l2cap_conf_rfc_get()) only detect a malformed option afterwards, once the running length has gone negative, by which point the out-of-bounds read has already executed. An existing post-hoc length check keeps the garbage value from being consumed, so this is not a data leak in the current control flow. It is still a validate-after-use ordering bug: up to 4 bytes are read past the end of the buffer before it is known to contain them, and it is fragile to future changes in the callers. Fix it at the source. Pass the end of the buffer into l2cap_get_conf_opt() and refuse to touch opt->val unless the full option (header + value) fits. Each caller computes an end pointer once before the loop and checks the return value directly instead of inferring the error from a negative length.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 to < cca81b4bc672604a84f6d224a55cc77ec7dee619affected
  • 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 to < f70d4aa88068096f35d73e3a05eff33c0a16b9cdaffected
  • 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 to < 7d871e969b941ce25653f7716203a0ea4d07ad4baffected
  • 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 to < 98d93c226bdfaa79bbdd86981921d7f106374225affected
  • 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 to < 996d3da39899aceb8f4910911a3f19a45a7d9d1baffected
  • 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 to < 73abbaf91aa33da87c008fb62c148ade561bb606affected
  • 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 to < 6b47bdaacfd0045687880177e0987055d8f4765aaffected
  • 7c9cbd0b5e38a1672fcd137894ace3b042dfbf69 to < 687617555cedfb74c9e3cb85d759b908dcb17856affected
  • 78c2887130f1a7d1883195732be1b6cdab667487affected
  • ac7c597c465eb09391e40febbe088bdad601080baffected
  • ade4560e4fea198866e033fe1c02f063d6d7db2eaffected
  • 99665dcf6ff803351b5e658f3a929cb498561e36affected
  • 2b59d36f22622c92c0b06aee7571f0a86a217188affected
  • 15d6538a0d6e0f6de5116081a948cba7cc3e1d3daffected
  • a556547bae00528f24b42786b41a14047db14b84affected
  • 3.16.66 to < 3.17affected
  • 3.18.138 to < 3.19affected
  • 4.4.178 to < 4.5affected
  • 4.9.167 to < 4.10affected
  • 4.14.110 to < 4.15affected
  • 4.19.33 to < 4.20affected
  • 5.0.6 to < 5.1affected

Linux Linux

Default version status: affected

  • 5.1affected
  • 0 to < 5.1unaffected
  • 5.10.261 to ≤ 5.10.*unaffected
  • 5.15.212 to ≤ 5.15.*unaffected
  • 6.1.178 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.96 to ≤ 6.12.*unaffected
  • 6.18.39 to ≤ 6.18.*unaffected
  • 7.1.4 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References