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CVE-2026-98579: nfc: llcp: fix sdreq TLV list leak on parse/alloc/send failure

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-18 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: fix sdreq TLV list leak on parse/alloc/send failure nfc_genl_llc_sdreq() builds a list of TLV nodes while walking nested netlink attrs, but 3 error paths (nested-attr parse failure, TLV alloc ENOMEM, nfc_llcp_send_snl_sdreq() failure) all skip freeing what was already queued. Route them through a new free_list label, mirroring the SDRES path in the same file which already does this. Harmless on the success path too -- send_snl_sdreq() drains the list as it moves nodes, so it's already empty by the time free_list runs.

Affected products

• Linux kernel: 3.10 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/08d2c069239ab425fdd333784a6a3b3e034e4aa0
• https://git.kernel.org/stable/c/0b01a946b0f234f5badd25968610b585a4895f08
• https://git.kernel.org/stable/c/5b1eca82085134bd92cd3810b0ef003c91e3f668
• https://git.kernel.org/stable/c/66f4300206b82b0b143ef0d9be90cd8d29f23a47
• https://git.kernel.org/stable/c/755bfc409748d8f3df64eb0eb26926270de3dd77
• https://git.kernel.org/stable/c/cbde7f5d326172d6dbb55cca0df42fa7e1ed8115
• https://git.kernel.org/stable/c/d3f60a7fc291d08cd9192a3b4cd5d3a223fa7d02
• https://git.kernel.org/stable/c/e43ec0191c1630f41e7043ac729ea6f1b8044a7f

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