CVE-2026-53091: net: pull headers in qdisc_pkt_len_segs_init()
Vulnerability summary
CVE-2026-53091 is a high (CVSS 8.4) Incorrect Calculation of Buffer Size vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.2% of scored vulnerabilities.
Not severe (CVSS 8.4, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 30 · Related 24Timeline
- 24-06-2026PublishedVulnerability first disclosed.
- 21-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: net: pull headers in qdisc_pkt_len_segs_init() Most ndo_start_xmit() methods expects headers of gso packets to be already in skb->head. net/core/tso.c users are particularly at risk, because tso_build_hdr() does a memcpy(hdr, skb->data, hdr_len); qdisc_pkt_len_segs_init() already does a dissection of gso packets. Use pskb_may_pull() instead of skb_header_pointer() to make sure drivers do not have to reimplement this. Some malicious packets could be fed, detect them so that we can drop them sooner with a new SKB_DROP_REASON_SKB_BAD_GSO drop_reason.
CVSS metrics
6 scores · 5 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated8.4HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated8.4HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated8.4HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H
- NVDNIST8.4HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H
EPSS trend
Probability
0.14%
Chance of exploitation in the next 30 days
Percentile
3%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.14% 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: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu149 products
- linuxAll versions (No fix recorded) | < 7.0.0-28.28
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 7.0.0-1009.9
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Chainguard50 products
- hyperv-daemons-6.18All versions (No fix recorded)
- linux-aws-6.12All versions (No fix recorded)
- linux-aws-6.18All versions (No fix recorded)
- linux-aws-6.18-boot-installedAll versions (No fix recorded)
- linux-aws-6.18-bootcAll versions (No fix recorded)
Debian1 product
- linuxAll versions (No fix recorded) | < 6.12.115-2 | < 7.0.10-1
3 vendors · 200 products · Showing 200 of 221
References
30 links- access.redhat.com/security/cve/CVE-2026-53091VDB EntryX Refsource REDHATAdvisoryThird Party Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2492270Issue TrackingX Refsource REDHATREPORTThird Party Advisory
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53091.jsonX Sadp Csaf VexWEBThird Party Advisory
