Incorrect Calculation Affecting kernel-doc package, versions *


Severity

Recommended
low

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (12th percentile)

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  • Snyk IDSNYK-RHEL8-KERNELDOC-8481210
  • published5 Dec 2024
  • disclosed4 Dec 2024

Introduced: 4 Dec 2024

NewCVE-2024-53125  (opens in a new tab)
CWE-682  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 kernel-doc.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-doc package and not the kernel-doc package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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

bpf: sync_linked_regs() must preserve subreg_def

Range propagation must not affect subreg_def marks, otherwise the following example is rewritten by verifier incorrectly when BPF_F_TEST_RND_HI32 flag is set:

0: call bpf_ktime_get_ns call bpf_ktime_get_ns 1: r0 &= 0x7fffffff after verifier r0 &= 0x7fffffff 2: w1 = w0 rewrites w1 = w0 3: if w0 < 10 goto +0 --------------> r11 = 0x2f5674a6 (r) 4: r1 >>= 32 r11 <<= 32 (r) 5: r0 = r1 r1 |= r11 (r) 6: exit; if w0 < 0xa goto pc+0 r1 >>= 32 r0 = r1 exit

(or zero extension of w1 at (2) is missing for architectures that require zero extension for upper register half).

The following happens w/o this patch:

  • r0 is marked as not a subreg at (0);
  • w1 is marked as subreg at (2);
  • w1 subreg_def is overridden at (3) by copy_register_state();
  • w1 is read at (5) but mark_insn_zext() does not mark (2) for zero extension, because w1 subreg_def is not set;
  • because of BPF_F_TEST_RND_HI32 flag verifier inserts random value for hi32 bits of (2) (marked (r));
  • this random value is read at (5).

CVSS Scores

version 3.1