CVE-2026-80798nfc: llcp: reject PDUs shorter than the LLCP header
- —Not scoredno CVSS score yet
- 0.23%Exploitation in 30 daysEPSS · top 86% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: reject PDUs shorter than the LLCP header Every LLCP PDU begins with a two-byte header (DSAP/SSAP + PTYPE), but the receive path never checked that a frame is at least LLCP_HEADER_SIZE bytes before parsing it. nfc_llcp_rx_skb() reads the header via nfc_llcp_ptype()/nfc_llcp_dsap()/ nfc_llcp_ssap(), which dereference pdu->data[0] and pdu->data[1], and a CONNECT or CC PDU then computes tlv_array_len = skb->len - LLCP_HEADER_SIZE; as a size_t and hands it to the TLV walk. When the frame is shorter than the header the subtraction wraps to a huge value and the walk runs far past the buffer, an out-of-bounds read. A nearby NFC device can reach this without authentication; LLCP link activation happens automatically after NFC-DEP. Guard the common receive choke point __nfc_llcp_recv(), shared by both the target (nfc_llcp_data_received()) and initiator (nfc_llcp_recv()) paths, so a short skb is dropped before the rx_work worker parses it. Use pskb_may_pull() rather than a skb->len test so the two header bytes are guaranteed to sit in the skb linear area even for a non-linear skb, matching how the sibling NCI and HCI receive paths validate their headers. Reproduced with a KFENCE out-of-bounds read via /dev/virtual_nci on linux-next. Found by 0sec automated security-research tooling (https://0sec.ai).
Timeline
ID reserved
By Linux
- 9 days later
· 9 days later
Published
- 45 days later
· 45 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.23% · top 86% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a – < e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82
- affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a – < f36cffea24bf3e2cc29a00d4b51dbcadc087d810
- affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a – < a7b9b449f5a5132221fff6adc11a9431ab8cd914
- affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a – < 3793d768b40f38bb97265dd5b9a8b8655c4e1b1d
- affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a – < eab47618e282602197db287ecbd1b09d356a2515
- affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a – < e969e98410051b1ef8cc318bfe0c7e3f24ec766d
- affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a – < ae5f20f5842f440b72d030e3a34fe182dd8eae42
- affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a – < d3d90243393c48146911c67fd3792b549d21d9e6
- affected d646960f7986fefb460a2b062d5ccc8ccfeacc3a – < 95674f506c6376d6722a23144c9acd26609771ed
- affected 3.3
- unaffected < 3.3
- unaffected 5.10.267 – ≤ 5.10.*
- unaffected 5.15.218 – ≤ 5.15.*
- unaffected 6.1.185 – ≤ 6.1.*
- unaffected 6.6.154 – ≤ 6.6.*
- unaffected 6.12.106 – ≤ 6.12.*
- unaffected 6.18.47 – ≤ 6.18.*
- unaffected 7.1.11 – ≤ 7.1.*
- unaffected 7.2.1 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References9
- https://git.kernel.org/stable/c/e6ec76a68dce04884dfeccfe5a5f0e9f67c0ec82 (opens in a new tab)
- https://git.kernel.org/stable/c/f36cffea24bf3e2cc29a00d4b51dbcadc087d810 (opens in a new tab)
- https://git.kernel.org/stable/c/a7b9b449f5a5132221fff6adc11a9431ab8cd914 (opens in a new tab)
- https://git.kernel.org/stable/c/3793d768b40f38bb97265dd5b9a8b8655c4e1b1d (opens in a new tab)
- https://git.kernel.org/stable/c/eab47618e282602197db287ecbd1b09d356a2515 (opens in a new tab)
- https://git.kernel.org/stable/c/e969e98410051b1ef8cc318bfe0c7e3f24ec766d (opens in a new tab)
- https://git.kernel.org/stable/c/ae5f20f5842f440b72d030e3a34fe182dd8eae42 (opens in a new tab)
- https://git.kernel.org/stable/c/d3d90243393c48146911c67fd3792b549d21d9e6 (opens in a new tab)
- https://git.kernel.org/stable/c/95674f506c6376d6722a23144c9acd26609771ed (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-71441 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-80798)Record last updated .