net/packet: prevent TX_RING byte count overflow
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.
CVE-2026-98850
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98850
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
"lessThan": "ae169d318d5d23bac76ece90a7e2b5cb760ed043",
"versionType": "git"
},
{
"status": "affected",
"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
"lessThan": "be12b221c0301111eeb023be04add3c6ad7c21fe",
"versionType": "git"
},
{
"status": "affected",
"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
"lessThan": "69ca64bbb528898916f309552053c32a04a36ebc",
"versionType": "git"
},
{
"status": "affected",
"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
"lessThan": "9fd63d284e251332f4874ef9023cde472f315f86",
"versionType": "git"
},
{
"status": "affected",
"version": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1",
"lessThan": "2cf81fc9505b148b1b70068303ea6ea4b1212403",
"versionType": "git"
}
],
"programFiles": [
"net/packet/af_packet.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.31"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.31",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/packet/af_packet.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98850
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #49005 · Revision 1
- Added to Heist Feed
- Publisher date