High 7.5Published Oct 18, 2026

CVE-2026-98555llc: fix skb UAF and leaks on llc_mac_hdr_init() failure

Updated under an hour ago (Oct 27, 2026, 6:30 AM ET)

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It affects Linux. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.21%, higher than 11% of scored CVEs.

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Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.21% (percentile 11)
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 24, 2026
First seen by InfoSec Signals: Oct 18, 2026

Affected products

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

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.