nfc: llcp: bound SNL TLV parsing to the skb and add length checks
Summary
| CVE | CVE-2026-90223 |
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| State | PUBLISHED |
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| Assigner | Linux |
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| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2026-09-17 17:17:17 UTC |
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| Updated | 2026-09-17 17:17:17 UTC |
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| Description | In the Linux kernel, the following vulnerability has been resolved:
nfc: llcp: bound SNL TLV parsing to the skb and add length checks
nfc_llcp_recv_snl() walked the SNL TLV list using a u16 offset/length
pair derived from skb->len, without bounding reads to the actual skb
data. Three problems followed:
- For a short frame (skb->len < LLCP_HEADER_SIZE), tlv_len underflowed.
- The per-TLV header (type, length) was read without checking that two
bytes remained.
- A declared TLV length could run past the end of the buffer, and an
SDREQ with length == 0 made "service_name_len = length - 1" underflow
(size_t), driving an out-of-bounds read in the following strncmp() /
nfc_llcp_sock_from_sn(). The SDRES case likewise read tlv[2]/tlv[3]
without a length check.
A nearby NFC device can reach this without authentication; LLCP link
activation happens automatically after NFC-DEP.
Walk the TLV list by pointer, bounded by skb_tail_pointer() over the
linear skb data, and validate each TLV declared length before use. Add
explicit length checks for SDREQ (>= 1) and SDRES (exactly 2).
Found by 0sec automated security-research tooling (https://0sec.ai). |
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Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| CNA |
Linux |
Linux |
affected 19cfe5843e86cc95542d9d875c9386e197956d75 88b36d36e12c9ba76decdb580d9c1907c084e587 git |
Not specified |
| CNA |
Linux |
Linux |
affected 19cfe5843e86cc95542d9d875c9386e197956d75 587fc2a5a35b41883b22b8f808fe5d345208914b git |
Not specified |
| CNA |
Linux |
Linux |
affected 19cfe5843e86cc95542d9d875c9386e197956d75 f04ac9bf2379f3e2470c400c235eb12f74891bef git |
Not specified |
| CNA |
Linux |
Linux |
affected 19cfe5843e86cc95542d9d875c9386e197956d75 02030f95820c42431280f4f945ff34247fb840ff git |
Not specified |
| CNA |
Linux |
Linux |
affected 19cfe5843e86cc95542d9d875c9386e197956d75 99fdb5c2522f365efa199d0117b641e35097041e git |
Not specified |
| CNA |
Linux |
Linux |
affected 19cfe5843e86cc95542d9d875c9386e197956d75 749a9048bf51a668ec3ab6c0392ba32325607281 git |
Not specified |
| CNA |
Linux |
Linux |
affected 19cfe5843e86cc95542d9d875c9386e197956d75 eeb16fb24cfe67947b832fd9ada5f488afc72579 git |
Not specified |
| CNA |
Linux |
Linux |
affected 19cfe5843e86cc95542d9d875c9386e197956d75 f4c7f37f0ab990952539dc68d931d65c3657600a git |
Not specified |
| CNA |
Linux |
Linux |
affected 3.8 |
Not specified |
| CNA |
Linux |
Linux |
unaffected 3.8 semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 5.10.270 5.10.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 5.15.221 5.15.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.1.188 6.1.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.6.157 6.6.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.12.110 6.12.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.18.52 6.18.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.2.6 7.2.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.3-rc1 * original_commit_for_fix |
Not specified |
References
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/eeb16fb24cfe67947b832fd9ada5f488afc72579 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/02030f95820c42431280f4f945ff34247fb840ff |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/f4c7f37f0ab990952539dc68d931d65c3657600a |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/749a9048bf51a668ec3ab6c0392ba32325607281 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/f04ac9bf2379f3e2470c400c235eb12f74891bef |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/99fdb5c2522f365efa199d0117b641e35097041e |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/88b36d36e12c9ba76decdb580d9c1907c084e587 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/587fc2a5a35b41883b22b8f808fe5d345208914b |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.