In the Linux kernel, the following vulnerability has been resolved:
bpf: consider that tail calls invalidate packet pointers
Tail-called programs could execute any of the helpers that invalidate
packet pointers. Hence, conservatively assume that each tail call
invalidates packet pointers.
Making the change in bpf_helper_changes_pkt_data() automatically makes
use of check_cfg() logic that computes 'changes_pkt_data' effect for
global sub-programs, such that the following program could be
rejected:
int tail_call(struct __sk_buff *sk)
{
bpf_tail_call_static(sk, &jmp_table, 0);
return 0;
}
SEC("tc")
int not_safe(struct __sk_buff *sk)
{
int *p = (void *)(long)sk->data;
... make p valid ...
tail_call(sk);
*p = 42; /* this is unsafe */
...
}
The tc_bpf2bpf.c:subprog_tc() needs change: mark it as a function that
can invalidate packet pointers. Otherwise, it can't be freplaced with
tailcall_freplace.c:entry_freplace() that does a tail call.
References
Configurations
Configuration 1 (hide)
|
History
10 Nov 2025, 17:35
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:* |
|
| First Time |
Linux linux Kernel
Linux |
|
| References | () https://git.kernel.org/stable/c/1a4607ffba35bf2a630aab299e34dd3f6e658d70 - Patch | |
| References | () https://git.kernel.org/stable/c/1c2244437f9ad3dd91215f920401a14f2542dbfc - Patch | |
| References | () https://git.kernel.org/stable/c/f1692ee23dcaaddc24ba407b269707ee5df1301f - Patch | |
| CWE | CWE-476 | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
Information
Published : 2025-05-05 15:15
Updated : 2025-11-10 17:35
NVD link : CVE-2024-58237
Mitre link : CVE-2024-58237
CVE.ORG link : CVE-2024-58237
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-476
NULL Pointer Dereference