bpf: Limit bpf program signature size
Published May 27, 2026
5.5
MEDIUMCVSS 3.1
EPSS 0.16%
Description
Practical BPF signatures are significantly smaller than KMALLOC_MAX_CACHE_SIZE
Allowing larger sizes opens the door for abuse by passing excessive size values and forcing the kernel into expensive allocation paths (via kmalloc_large or vmalloc).
Affected products
-
Affected
- ≥ , <
- ≥ , <
- ≥ , <
-
Affected
- 6.18
Unaffected
- ≥ 0, < 6.18
- ≥ 6.18.14, ≤ 6.18.*
- ≥ 6.19.4, ≤ 6.19.*
- 7.0
Default status is the baseline for the product. Each version can override it (patched versions can be marked unaffected).
- ≥ 6.18 · < 6.18.14
- ≥ 6.19 · < 6.19.4
No data.
Red Hat Enterprise Linux 10
kernel
Fix deferred
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise Linux 8
kernel-rt
Not affected
Red Hat Enterprise Linux 9
kernel
Not affected
Red Hat Enterprise Linux 9
kernel-rt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Fix deferred | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
References (9)
- https://access.redhat.com/security/cve/CVE-2026-45971 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2482145 Issue Tracking
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-32255 Advisory
- https://git.kernel.org/stable/c/5835a077c6f5c565d525eaca9fac01572b97a9b9 Patch
- https://git.kernel.org/stable/c/ea1535e28bb3773fc0b3cbd1f3842b808016990c Patch
- https://git.kernel.org/stable/c/eb8166c79097996396468a341de258a798789d36 Patch
- https://lore.kernel.org/linux-cve-announce/2026052736-CVE-2026-45971-592c@gregkh/T
- https://nvd.nist.gov/vuln/detail/CVE-2026-45971
- https://www.cve.org/CVERecord?id=CVE-2026-45971
Change history (0)
No recorded changes yet.
CVE.org / MITRE
CISA Vulnrichment
No data
GitHub
No data