llc: fix skb UAF and leaks on llc_mac_hdr_init() failure (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.31 % · percentile 24 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
Description
In the Linux kernel, the following vulnerability has been resolved: llc: fix skb UAF and leaks on llc_mac_hdr_init() failure In llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(), if llc_mac_hdr_init() fails, kfree_skb(skb) is called instead of kfree_skb(nskb). This leaks the newly allocated nskb, reads from the freed skb via LLC_I_GET_NR(pdu), and double-frees skb when llc_conn_state_process() drops its reference. In llc_sap_action_send_xid_r() and llc_sap_action_send_test_r(), nskb is leaked if llc_mac_hdr_init() returns an error. Free nskb in all three error paths.
References
- https://git.kernel.org/stable/c/fec0fe6838a7f45175667701fb51abb23a6ffb1e
- https://git.kernel.org/stable/c/b859ba18b5a1067f71db5618c6a4a70d55fa308b
- https://git.kernel.org/stable/c/8b855b645841b5a04e20339a22bb6d593c9b790d
- https://git.kernel.org/stable/c/d360b31f1a3666579422872aa7d1a751e20b76f9
- https://git.kernel.org/stable/c/060f827aa3dc47939ee306da715cd6700d129616
- https://git.kernel.org/stable/c/41dcae82bece9f106b4dff0ee777bba8d157c8a8
- https://git.kernel.org/stable/c/cb3528ad8bb46fa6252f5d14ced7febddc18515d
- https://git.kernel.org/stable/c/72f9dd522f8d6c5a00be9695c7bb74631eb5069e
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | Linux |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-103600
- GCVE · GCVE-0-2026-98555
CERT-FR advisories
- CERTFR-2026-AVI-1375 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fec0fe6838a7f45175667701fb51abb23a6ffb1e ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b859ba18b5a1067f71db5618c6a4a70d55fa308b ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8b855b645841b5a04e20339a22bb6d593c9b790d ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d360b31f1a3666579422872aa7d1a751e20b76f9 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 060f827aa3dc47939ee306da715cd6700d129616 ; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 41dcae82bece9f106b4dff0ee777bba8d157c8a8 |
| Linux · Linux | affected 2.6.12 ; unaffected 0 < 2.6.12 ; unaffected 5.10.271 ≤ 5.10.* ; unaffected 5.15.222 ≤ 5.15.* ; unaffected 6.1.189 ≤ 6.1.* ; unaffected 6.6.158 ≤ 6.6.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |