CVE-2026-53151rxrpc: Fix the ACK parser to extract the SACK table for parsing
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix the ACK parser to extract the SACK table for parsing Fix modification of the received skbuff in rxrpc_input_soft_acks() and a potential incorrect access of the buffer in a fragmented UDP packet (the packet would probably have to be deliberately pre-generated as fragmented) when AF_RXRPC tries to extract the contents of the SACK table by copying out the contents of the SACK table into a buffer before attempting to parse AF_RXRPC assumes that it can just call skb_condense() and then validly access the SACK table from skb->data and that it will be a flat buffer - but skb_condense() can silently fail to do anything under some circumstances. Note that whilst rxrpc_input_soft_acks() should be able to parse extended ACKs, the rest of AF_RXRPC doesn't currently support that. Further, there's then no need to call skb_condense() in rxrpc_input_ack(), so don't.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- 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
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from d57a3a151660902091491ac2633134e1be92557f before 5d1ae4e17a3ecd8561cdb4f4f70152f41039c4e1; from d57a3a151660902091491ac2633134e1be92557f before 775c5e89272a2615b72bb84f611ba66fa3b7493e; from d57a3a151660902091491ac2633134e1be92557f before 566c4c1244de50fbff1f89ff93c9d7b0fc256db4; from d57a3a151660902091491ac2633134e1be92557f before 224298450be5c04d2a6ea1c2a94669d7ebf65d00; from d57a3a151660902091491ac2633134e1be92557f before 333b6d5bb9f87827ac2639c737bf9613dbae7253 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.2 before 6.6.144; from 6.7 before 6.12.95; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; 7.1; 7.1; 7.1; and 3 more ranges | NVD |
References
- https://git.kernel.org/stable/c/5d1ae4e17a3ecd8561cdb4f4f70152f41039c4e1patch
- https://git.kernel.org/stable/c/775c5e89272a2615b72bb84f611ba66fa3b7493epatch
- https://git.kernel.org/stable/c/566c4c1244de50fbff1f89ff93c9d7b0fc256db4patch
- https://git.kernel.org/stable/c/224298450be5c04d2a6ea1c2a94669d7ebf65d00patch
- https://git.kernel.org/stable/c/333b6d5bb9f87827ac2639c737bf9613dbae7253patch
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.