CVE-2023-53669
published 2025-10-07CVE-2023-53669: In the Linux kernel, the following vulnerability has been resolved: tcp: fix skb_copy_ubufs() vs BIG TCP David Ahern reported crashes in skb_copy_ubufs()…
PriorityP420medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.14%
4.0th percentile
In the Linux kernel, the following vulnerability has been resolved:
tcp: fix skb_copy_ubufs() vs BIG TCP
David Ahern reported crashes in skb_copy_ubufs() caused by TCP tx zerocopy
using hugepages, and skb length bigger than ~68 KB.
skb_copy_ubufs() assumed it could copy all payload using up to
MAX_SKB_FRAGS order-0 pages.
This assumption broke when BIG TCP was able to put up to 512 KB per skb.
We did not hit this bug at Google because we use CONFIG_MAX_SKB_FRAGS=45
and limit gso_max_size to 180000.
A solution is to use higher order pages if needed.
v2: add missing __GFP_COMP, or we leak memory.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.1.37-1 (bookworm) | linux 6.1.37-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 7c4e983c4f3cf94fcd879730c6caa877e0768a4d < 7fa93e39fbb0566019c388a8038a4d58552e0910 | 7fa93e39fbb0566019c388a8038a4d58552e0910 |
| linux | linux | >= 7c4e983c4f3cf94fcd879730c6caa877e0768a4d < 3c77a377877acbaf03cd7caa21d3644a5dd16301 | 3c77a377877acbaf03cd7caa21d3644a5dd16301 |
| linux | linux | >= 7c4e983c4f3cf94fcd879730c6caa877e0768a4d < 9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f | 9cd62f0ba465cf647c7d8c2ca7b0d99ea0c1328f |
| linux | linux | >= 7c4e983c4f3cf94fcd879730c6caa877e0768a4d < 7e692df3933628d974acb9f5b334d2b3e885e2a6 | 7e692df3933628d974acb9f5b334d2b3e885e2a6 |
| linux | linux_kernel | >= 0 < 6.1.37-1 | 6.1.37-1 |
| linux | linux_kernel | >= 0 < 6.4.4-1 | 6.4.4-1 |
| linux | linux_kernel | >= 0 < 6.4.4-1 | 6.4.4-1 |
| linux | linux_kernel | >= 5.19 < 6.1.29 | 6.1.29 |
| linux | linux_kernel | >= 6.2 < 6.2.16 | 6.2.16 |
| linux | linux_kernel | >= 6.3 < 6.3.3 | 6.3.3 |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
GHSA-3p8v-593f-mgx8: In the Linux kernel, the following vulnerability has been resolved:
tcp: fix skb_copy_ubufs() vs BIG TCP
David Ahern reported crashes in skb_copy_ub
ghsa_unreviewed·2025-10-07
CVE-2023-53669 [MEDIUM] CWE-401 GHSA-3p8v-593f-mgx8: In the Linux kernel, the following vulnerability has been resolved:
tcp: fix skb_copy_ubufs() vs BIG TCP
David Ahern reported crashes in skb_copy_ub
In the Linux kernel, the following vulnerability has been resolved:
tcp: fix skb_copy_ubufs() vs BIG TCP
David Ahern reported crashes in skb_copy_ubufs() caused by TCP tx zerocopy
using hugepages, and skb length bigger than ~68 KB.
skb_copy_ubufs() assumed it could copy all payload using up to
MAX_SKB_FRAGS order-0 pages.
This assumption broke when BIG TCP was able to put up to 512 KB per skb.
We did not hit this bug at Google because we use CONFIG_MAX_SKB_FRAGS=45
and limit gso_max_size to 180000.
A solution is to use higher order pages if needed.
v2: add missing __GFP_COMP, or we leak memory.
OSV
CVE-2023-53669: In the Linux kernel, the following vulnerability has been resolved: tcp: fix skb_copy_ubufs() vs BIG TCP David Ahern reported crashes in skb_copy_ubuf
osv·2025-10-07·CVSS 5.5
CVE-2023-53669 [MEDIUM] CVE-2023-53669: In the Linux kernel, the following vulnerability has been resolved: tcp: fix skb_copy_ubufs() vs BIG TCP David Ahern reported crashes in skb_copy_ubuf
In the Linux kernel, the following vulnerability has been resolved: tcp: fix skb_copy_ubufs() vs BIG TCP David Ahern reported crashes in skb_copy_ubufs() caused by TCP tx zerocopy using hugepages, and skb length bigger than ~68 KB. skb_copy_ubufs() assumed it could copy all payload using up to MAX_SKB_FRAGS order-0 pages. This assumption broke when BIG TCP was able to put up to 512 KB per skb. We did not hit this bug at Google because we use CONFIG_MAX_SKB_FRAGS=45 and limit gso_max_size to 180000. A solution is to use higher order pages if needed. v2: add missing __GFP_COMP, or we leak memory.
Red Hat
kernel: tcp: fix skb_copy_ubufs() vs BIG TCP
vendor_redhat·2025-10-07·CVSS 5.5
CVE-2023-53669 [MEDIUM] CWE-131 kernel: tcp: fix skb_copy_ubufs() vs BIG TCP
kernel: tcp: fix skb_copy_ubufs() vs BIG TCP
In the Linux kernel, the following vulnerability has been resolved:
tcp: fix skb_copy_ubufs() vs BIG TCP
David Ahern reported crashes in skb_copy_ubufs() caused by TCP tx zerocopy
using hugepages, and skb length bigger than ~68 KB.
skb_copy_ubufs() assumed it could copy all payload using up to
MAX_SKB_FRAGS order-0 pages.
This assumption broke when BIG TCP was able to put up to 512 KB per skb.
We did not hit this bug at Google because we use CONFIG_MAX_SKB_FRAGS=45
and limit gso_max_size to 180000.
A solution is to use higher order pages if needed.
v2: add missing __GFP_COMP, or we leak memory.
Statement: The bug could happen in skb_copy_ubufs() when BIG TCP allows very large skbs (e.g., ~512 KB) and TCP TX zerocopy with hugepages is used. Lea
Debian
CVE-2023-53669: linux - In the Linux kernel, the following vulnerability has been resolved: tcp: fix sk...
vendor_debian·2023·CVSS 5.5
CVE-2023-53669 [MEDIUM] CVE-2023-53669: linux - In the Linux kernel, the following vulnerability has been resolved: tcp: fix sk...
In the Linux kernel, the following vulnerability has been resolved: tcp: fix skb_copy_ubufs() vs BIG TCP David Ahern reported crashes in skb_copy_ubufs() caused by TCP tx zerocopy using hugepages, and skb length bigger than ~68 KB. skb_copy_ubufs() assumed it could copy all payload using up to MAX_SKB_FRAGS order-0 pages. This assumption broke when BIG TCP was able to put up to 512 KB per skb. We did not hit this bug at Google because we use CONFIG_MAX_SKB_FRAGS=45 and limit gso_max_size to 180000. A solution is to use higher order pages if needed. v2: add missing __GFP_COMP, or we leak memory.
Scope: local
bookworm: resolved (fixed in 6.1.37-1)
bullseye: resolved
forky: resolved (fixed in 6.4.4-1)
sid: resolved (fixed in 6.4.4-1)
trixie: resolved (fixed in 6.4.4-1)
No detection rules found.
No public exploits indexed.
2025-10-07
Published