CVE-2026-98850net/packet: prevent TX_RING byte count overflow
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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
- 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 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 before be12b221c0301111eeb023be04add3c6ad7c21fe; 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 builds before 69ca64bbb528898916f309552053c32a04a36ebc; 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 builds before 9fd63d284e251332f4874ef9023cde472f315f86; 69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 builds before 2cf81fc9505b148b1b70068303ea6ea4b1212403 | CNA record |
References
- https://git.kernel.org/stable/c/be12b221c0301111eeb023be04add3c6ad7c21fe
- https://git.kernel.org/stable/c/69ca64bbb528898916f309552053c32a04a36ebc
- https://git.kernel.org/stable/c/9fd63d284e251332f4874ef9023cde472f315f86
- https://git.kernel.org/stable/c/2cf81fc9505b148b1b70068303ea6ea4b1212403
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.