CVE-2024-50254

/// Technical description

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

bpf: Free dynamically allocated bits in bpf_iter_bits_destroy()

bpf_iter_bits_destroy() uses "kit->nr_bits <= 64" to check whether the

bits are dynamically allocated. However, the check is incorrect and may

cause a kmemleak as shown below:

unreferenced object 0xffff88812628c8c0 (size 32):

comm "swapper/0", pid 1, jiffies 4294727320

hex dump (first 32 bytes):

b0 c1 55 f5 81 88 ff ff f0 f0 f0 f0 f0 f0 f0 f0 ..U...........

f0 f0 f0 f0 f0 f0 f0 f0 00 00 00 00 00 00 00 00 ..............

backtrace (crc 781e32cc):

[<00000000c452b4ab>] kmemleak_alloc+0x4b/0x80

[<0000000004e09f80>] __kmalloc_node_noprof+0x480/0x5c0

[<00000000597124d6>] __alloc.isra.0+0x89/0xb0

[<000000004ebfffcd>] alloc_bulk+0x2af/0x720

[<00000000d9c10145>] prefill_mem_cache+0x7f/0xb0

[<00000000ff9738ff>] bpf_mem_alloc_init+0x3e2/0x610

[<000000008b616eac>] bpf_global_ma_init+0x19/0x30

[<00000000fc473efc>] do_one_initcall+0xd3/0x3c0

[<00000

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References