Description
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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 to < 1e6ee93cea4b77253b1b81eb5759899f959ebee3affected69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 to < 70fefff0801d4c5405e515592d1e7ad1351530cdaffected69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 to < 4848c175b5984e6358bcca794ac1dee4d527efccaffected69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 to < ae169d318d5d23bac76ece90a7e2b5cb760ed043affected69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 to < be12b221c0301111eeb023be04add3c6ad7c21feaffected69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 to < 69ca64bbb528898916f309552053c32a04a36ebcaffected69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 to < 9fd63d284e251332f4874ef9023cde472f315f86affected69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1 to < 2cf81fc9505b148b1b70068303ea6ea4b1212403affected
Linux Linux
Default version status: affected
2.6.31affected0 to < 2.6.31unaffected5.10.273 to ≤ 5.10.*unaffected5.15.224 to ≤ 5.15.*unaffected6.1.191 to ≤ 6.1.*unaffected6.6.160 to ≤ 6.6.*unaffected6.12.113 to ≤ 6.12.*unaffected6.18.56 to ≤ 6.18.*unaffected7.2.10 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/1e6ee93cea4b77253b1b81eb5759899f959ebee3 ↗
- https://git.kernel.org/stable/c/70fefff0801d4c5405e515592d1e7ad1351530cd ↗
- https://git.kernel.org/stable/c/4848c175b5984e6358bcca794ac1dee4d527efcc ↗
- https://git.kernel.org/stable/c/ae169d318d5d23bac76ece90a7e2b5cb760ed043 ↗
- 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 ↗