CVE-2026-98555llc: fix skb UAF and leaks on llc_mac_hdr_init() failure
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 18, 2026
- First seen by InfoSec Signals
- Oct 18, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before fec0fe6838a7f45175667701fb51abb23a6ffb1e; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before b859ba18b5a1067f71db5618c6a4a70d55fa308b; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 8b855b645841b5a04e20339a22bb6d593c9b790d; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before d360b31f1a3666579422872aa7d1a751e20b76f9; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 060f827aa3dc47939ee306da715cd6700d129616; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 41dcae82bece9f106b4dff0ee777bba8d157c8a8; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before cb3528ad8bb46fa6252f5d14ced7febddc18515d; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 72f9dd522f8d6c5a00be9695c7bb74631eb5069e | CNA record |
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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.