CVE-2026-98850
UnratedPublished 2026-10-18
CVSS
—
Unrated
EPSS
—
exploit probability
Active Exploit
No
not yet listed
What is CVE-2026-98850?
In the Linux kernel, the following vulnerability has been resolved: net/packet: prevent TX_RING byte count overflow tpacket_snd() drains every SEND_REQUEST frame in a TX ring and adds each valid packet length to the signed int len_sum. Userspace can recycle completed frames concurrently, so a single blocking send call is not bounded by the ring size. After enough successful transmissions len_sum wraps into the negative range. In particular, 65536 65535-byte frames followed by a 65007-byte frame produce 0xfffffdef, or -EIOCBQUEUED. sock_sendmsg_nosec() treats that as an impossible return and triggers a BUG. On systems configured to panic on oops, a CAP_NET_RAW holder can panic the host kernel. Stop before the next frame would make the byte count exceed INT_MAX. The positive short count leaves that frame pending for a later send call. A two-thread TPACKET_V2 reproducer triggered the BUG on an arm64 build of Linux 7.3-rc4. With this change, the same reproducer returned the expected positive short count without an oops.
CVSS Score Explained
No CVSS score available for this CVE yet.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- ›https://git.kernel.org/stable/c/2cf81fc9505b148b1b70068303ea6ea4b1212403
- ›https://git.kernel.org/stable/c/69ca64bbb528898916f309552053c32a04a36ebc
- ›https://git.kernel.org/stable/c/9fd63d284e251332f4874ef9023cde472f315f86
- ›https://git.kernel.org/stable/c/be12b221c0301111eeb023be04add3c6ad7c21fe
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