CVE-2026-53151: rxrpc: Fix the ACK parser to extract the SACK table for parsing
Vulnerability summary
CVE-2026-53151 is a critical (CVSS 9.8) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.67% chance of exploitation in the next 30 days, higher than 52% of scored vulnerabilities.
Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 20 · Related 19Timeline
- 25-06-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
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 metrics
6 scores · 5 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · ChainguardEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.67%
Chance of exploitation in the next 30 days
Percentile
52%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.67% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu141 products
- linux< 6.8.0-137.137 | All versions (No fix recorded) | < 7.0.0-29.29
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 6.8.0-1062.65 | All versions (No fix recorded) | < 7.0.0-1010.10
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Chainguard13 products
- linux-aws-6.12< 6.12.96-r0
- linux-aws-6.18< 6.18.38-r0
- linux-azure-6.12< 6.12.96-r0
- linux-azure-6.18< 6.18.38-r0
- linux-gcp-6.12< 6.12.96-r0
Linux2 products
- linux≥ d57a3a151660902091491ac2633134e1be92557f, < 5d1ae4e17a3ecd8561cdb4f4f70152f41039c4e1 | ≥ d57a3a151660902091491ac2633134e1be92557f, < 775c5e89272a2615b72bb84f611ba66fa3b7493e | ≥ d57a3a151660902091491ac2633134e1be92557f, < 566c4c1244de50fbff1f89ff93c9d7b0fc256db4 | ≥ d57a3a151660902091491ac2633134e1be92557f, < 224298450be5c04d2a6ea1c2a94669d7ebf65d00 | ≥ d57a3a151660902091491ac2633134e1be92557f, < 333b6d5bb9f87827ac2639c737bf9613dbae7253 | 6.2
- linux_kernel≥ 6.2, < 6.6.144 | ≥ 6.7, < 6.12.95 | ≥ 6.13, < 6.18.36 | ≥ 6.19, < 7.0.13 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4 | 7.1:rc5 | 7.1:rc6 | 7.1:rc7
Debian1 product
- linux< 6.12.95-1 | < 7.0.13-1
4 vendors · 157 products
