Riskcovery

CVE-2026-90210

bpf: Fix UAF in bpf_trampoline_multi_attach_free on update failure

State
Published
Severity
7.8 High
Published
Sep 17, 2026
Updated
Oct 19, 2026
Reserved
Sep 11, 2026

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix UAF in bpf_trampoline_multi_attach_free on update failure

When bpf_trampoline_update() fails before modify_fentry_multi()/ unregister_fentry_multi() is called, cur_image is unchanged (cur_image == old_image) and ftrace still calls into it. Freeing old_image in that case causes a UAF.

Only free old_image when it differs from cur_image.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • aef4dfa790b22d8052cfb78044eadbe03c876c39 to before 65c3939656fd7848e9274faa07c26748b5bf049cAffected
  • aef4dfa790b22d8052cfb78044eadbe03c876c39 to before 0253073fb7d79a2dd2eae9581ea16db2aef395a6Affected
LinuxLinux
  • 7.2Affected
  • before 7.2Not affected
  • 7.2.6 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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