CVE-2026-52929: sctp: stream: fully roll back denied add-stream state
Vulnerability summary
CVE-2026-52929 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.87% chance of exploitation in the next 30 days, higher than 58.9% of scored vulnerabilities.
Severe, CVSS 7.5 (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 41 · Related 41Timeline
- 24-06-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: sctp: stream: fully roll back denied add-stream state When ADD_OUT_STREAMS is denied, SCTP only shrinks the queued chunks and then lowers outcnt. That leaves removed stream metadata behind, so a later re-add can reuse a stale ext and hit a null-pointer dereference in the scheduler get path. Fix the rollback by tearing down the removed stream state the same way other stream resizes do. Unschedule the current scheduler state, drop the removed stream ext state with sctp_stream_outq_migrate(), and then reschedule the remaining streams. This keeps scheduler-private RR/FC/PRIO lists consistent while fully rolling back denied outgoing stream additions.
CVSS metrics
5 scores · 5 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.87%
Chance of exploitation in the next 30 days
Percentile
59%
Versus all other CVEs
30-day change
Increase +0.41 pp
From 0.47% 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.
Ubuntu167 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-146.146 | < 7.0.0-31.31
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1066.69 | < 7.0.0-1012.12
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Chainguard6 products
- linux-azure-6.18< 6.18.38-r0
- linux-gcp-6.18< 6.18.38-r0
- linux-gcp-6.18-bootc-boot-installed< 6.18.38-r0
- linux-qemu-6.18< 6.18.38-r0
- linux-qemu-6.18-bootc-boot-installed< 6.18.38-r0
Linux2 products
- linux≥ 637784ade221a3c8a7ecd0f583eddd95d6276b9a, < 0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85 | ≥ 637784ade221a3c8a7ecd0f583eddd95d6276b9a, < a6724b7b812ac8793514a1d5938db5d9d29ae725 | ≥ 637784ade221a3c8a7ecd0f583eddd95d6276b9a, < 9662eb0401518f0b4681f10e7fbf688f504f24cf | ≥ 637784ade221a3c8a7ecd0f583eddd95d6276b9a, < 7dd9a42b044aad2dbe037db1c1e2943582485b44 | ≥ 637784ade221a3c8a7ecd0f583eddd95d6276b9a, < 39dc2b0eb5371a669ebc9ec6072b9184eac95418 | ≥ 637784ade221a3c8a7ecd0f583eddd95d6276b9a, < d5ea0b3e261fcb2cfff142675516165244cab1da | ≥ 637784ade221a3c8a7ecd0f583eddd95d6276b9a, < 1c6773b8c081509dcd5cd2954f2b02c50c00f151 | ≥ 637784ade221a3c8a7ecd0f583eddd95d6276b9a, < a5f8a90ac9f77c678a9781c0a464b635e0d63e49 | 4.15
- linux_kernel≥ 4.15, < 5.10.259 | ≥ 5.11, < 5.15.210 | ≥ 5.16, < 6.1.176 | ≥ 6.2, < 6.6.143 | ≥ 6.7, < 6.12.94 | ≥ 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< 6.1.176-1 | < 6.12.94-1 | < 7.0.13-1
4 vendors · 176 products
