CVE-2024-26591

bpf: Fix re-attachment branch in bpf_tracing_prog_attach

Published Feb 22, 2024 CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Description
In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix re-attachment branch in bpf_tracing_prog_attach

The following case can cause a crash due to missing attach_btf:

1) load rawtp program
2) load fentry program with rawtp as target_fd
3) create tracing link for fentry program with target_fd = 0
4) repeat 3

In the end we have:

- prog->aux->dst_trampoline == NULL
- tgt_prog == NULL (because we did not provide target_fd to link_create)
- prog->aux->attach_btf == NULL (the program was loaded with attach_prog_fd=X)
- the program was loaded for tgt_prog but we have no way to find out which one

BUG: kernel NULL pointer dereference, address: 0000000000000058
Call Trace:
<TASK>
? __die+0x20/0x70
? page_fault_oops+0x15b/0x430
? fixup_exception+0x22/0x330
? exc_page_fault+0x6f/0x170
? asm_exc_page_fault+0x22/0x30
? bpf_tracing_prog_attach+0x279/0x560
? btf_obj_id+0x5/0x10
bpf_tracing_prog_attach+0x439/0x560
__sys_bpf+0x1cf4/0x2de0
__x64_sys_bpf+0x1c/0x30
do_syscall_64+0x41/0xf0
entry_SYSCALL_64_after_hwframe+0x6e/0x76

Return -EINVAL in this situation.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Ubuntu USN Ubuntu USN USN-6688-1 Linux kernel (OEM) vulnerabilities
Ubuntu USN Ubuntu USN USN-6725-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-6725-2 Linux kernel (AWS) vulnerabilities
Ubuntu USN Ubuntu USN USN-6743-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-6743-2 Linux kernel (Low Latency) vulnerabilities
Ubuntu USN Ubuntu USN USN-6743-3 Linux kernel (Azure) vulnerabilities
History
Type Values Removed Values Added
First Time appeared Redhat
Redhat enterprise Linux
CPEs cpe:/a:redhat:enterprise_linux:9
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Weaknesses

Sources

Status
PUBLISHED
Assigner
Linux
Published
Updated
May 11, 2026, 8:00 PM
Reserved
Feb 19, 2024, 2:20 PM
Status
Modified
Published
Feb 22, 2024, 5:15 PM
Modified
Jun 17, 2026, 7:17 AM
Severity
Low
Public date
Feb 22, 2024, 12:00 AM