CVE-2026-31682: linux Out-of-bounds Read
Vulnerability summary
CVE-2026-31682 is a critical (CVSS 9.1) Out-of-bounds Read vulnerability in linux. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 40.4% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 26 · Related 37Timeline
- 25-04-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: bridge: br_nd_send: linearize skb before parsing ND options br_nd_send() parses neighbour discovery options from ns->opt[] and assumes that these options are in the linear part of request. Its callers only guarantee that the ICMPv6 header and target address are available, so the option area can still be non-linear. Parsing ns->opt[] in that case can access data past the linear buffer. Linearize request before option parsing and derive ns from the linear network header.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- NVDNIST9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS trend
Probability
0.48%
Chance of exploitation in the next 30 days
Percentile
40%
Versus all other CVEs
30-day change
0.00 pp
From 0.48% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu156 products
- linux< 4.15.0-253.265 | < 5.4.0-233.253 | < 5.15.0-185.195 | < 6.8.0-134.134 | < 6.17.0-40.40
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 4.15.0-1194.207 | < 5.4.0-1161.172 | < 5.15.0-1111.118 | < 6.8.0-1060.63 | < 6.17.0-1019.19
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ ed842faeb2bd49256f00485402f3113205f91d30, < c68433fd291c9e88c00292095172c62d1997d662 | ≥ ed842faeb2bd49256f00485402f3113205f91d30, < 4f397b950c916e9a1f8a4fce04ea0110206cad47 | ≥ ed842faeb2bd49256f00485402f3113205f91d30, < bd91ec85aa4c77d645bd2739fc56784157a88ca2 | ≥ ed842faeb2bd49256f00485402f3113205f91d30, < 658261898130da620fc3d0fbb0523efb3366cb55 | ≥ ed842faeb2bd49256f00485402f3113205f91d30, < 2ba4caba423ed94d63006eb1d2227b0332ab7fcd | ≥ ed842faeb2bd49256f00485402f3113205f91d30, < 9c55e41c73af5c4511070933b1bd25248521270c | ≥ ed842faeb2bd49256f00485402f3113205f91d30, < 3a30f6469b058574f49efde61cd6f5d79e576053 | ≥ ed842faeb2bd49256f00485402f3113205f91d30, < a01aee7cafc575bb82f5529e8734e7052f9b16ea | 4.15
- linux_kernel≥ 4.15, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.168 | ≥ 6.2, < 6.6.134 | ≥ 6.7, < 6.12.81 | ≥ 6.13, < 6.18.22 | ≥ 6.19, < 6.19.12 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6
Debian1 product
- linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.12-1
3 vendors · 159 products
