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CVE-2026-98850

net/packet: prevent TX_RING byte count overflow PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 before ae169d318d5d23bac76ece90a7e2b5cb760ed043; affected 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 before be12b221c0301111eeb023be04add3c6ad7c21fe; affected 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 before 69ca64bbb528898916f309552053c32a04a36ebc; affected 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 before 9fd63d284e251332f4874ef9023cde472f315f86; affected 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 before 2cf81fc9505b148b1b70068303ea6ea4b1212403
Linux / Linuxaffected 2.6.31; unaffected 0 before 2.6.31; unaffected 6.6.160 through 6.6.*; unaffected 6.12.113 through 6.12.*; unaffected 6.18.56 through 6.18.*; unaffected 7.2.10 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References