CVE-2026-23359bpf: Fix stack-out-of-bounds write in devmap
- 7.8HighCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 96% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix stack-out-of-bounds write in devmap get_upper_ifindexes() iterates over all upper devices and writes their indices into an array without checking bounds. Also the callers assume that the max number of upper devices is MAX_NEST_DEV and allocate excluded_devices[1+MAX_NEST_DEV] on the stack, but that assumption is not correct and the number of upper devices could be larger than MAX_NEST_DEV (e.g., many macvlans), causing a stack-out-of-bounds write. Add a max parameter to get_upper_ifindexes() to avoid the issue. When there are too many upper devices, return -EOVERFLOW and abort the redirect. To reproduce, create more than MAX_NEST_DEV(8) macvlans on a device with an XDP program attached using BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS. Then send a packet to the device to trigger the XDP redirect path.
Timeline
ID reserved
By Linux
- 2 months later
· 2 months later
Published
- 8 months later
· 8 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 96% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected aeea1b86f9363f3feabb496534d886f082a89f21 – < 88df604f0d16a692867582350ce3f2fcd22243f1
- affected aeea1b86f9363f3feabb496534d886f082a89f21 – < 5000e40acc8d0c36ab709662e32120986ac22e7e
- affected aeea1b86f9363f3feabb496534d886f082a89f21 – < 8a95fb9df1105b1618872c2846a6c01e3ba20b45
- affected aeea1b86f9363f3feabb496534d886f082a89f21 – < d2c31d8e03d05edc16656e5ffe187f0d1da763d7
- affected aeea1b86f9363f3feabb496534d886f082a89f21 – < 75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2
- affected aeea1b86f9363f3feabb496534d886f082a89f21 – < ca831567908fd3f73cf97d8a6c09a5054697a182
- affected aeea1b86f9363f3feabb496534d886f082a89f21 – < b7bf516c3ecd9a2aae2dc2635178ab87b734fef1
- affected 5.15
- unaffected < 5.15
- unaffected 5.15.203 – ≤ 5.15.*
- unaffected 6.1.167 – ≤ 6.1.*
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.77 – ≤ 6.12.*
- unaffected 6.18.17 – ≤ 6.18.*
- unaffected 6.19.7 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References11
- https://git.kernel.org/stable/c/88df604f0d16a692867582350ce3f2fcd22243f1 (opens in a new tab)
- https://git.kernel.org/stable/c/5000e40acc8d0c36ab709662e32120986ac22e7e (opens in a new tab)
- https://git.kernel.org/stable/c/8a95fb9df1105b1618872c2846a6c01e3ba20b45 (opens in a new tab)
- https://git.kernel.org/stable/c/d2c31d8e03d05edc16656e5ffe187f0d1da763d7 (opens in a new tab)
- https://git.kernel.org/stable/c/75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2 (opens in a new tab)
- https://git.kernel.org/stable/c/ca831567908fd3f73cf97d8a6c09a5054697a182 (opens in a new tab)
- https://git.kernel.org/stable/c/b7bf516c3ecd9a2aae2dc2635178ab87b734fef1 (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-15336 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-23359)Record last updated .