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Review reviewHigh

CVE-2024-26958

Linux Linux, SIMATIC S7-1500 TM MFP - GNU/Linux subsystem, linux kernel

In the Linux kernel, the following vulnerability has been resolved: nfs: fix UAF in direct writes In production we have been hitting the following warning consistently ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 17 PID: 1800359 at lib/refcount.c:28 refcount_warn_saturate+0x9c/0xe0 Workqueue: nfsiod nfs_direct_write_schedule_work [nfs] RIP: 0010:refcount_warn_saturate+0x9c/0xe0 PKRU: 55555554 Call Trace: <TASK> ? __warn+0x9f/0x130 ? refcount_warn_saturate+0x9c/0xe0 ? report_bug+0xcc/0x150 ? handle_bug+0x3d/0x70 ? exc_invalid_op+0x16/0x40 ? asm_ex...

CVSS
7.8
EPSS
0.24%
15.6% percentile
CISA KEV
Not listed
Published
2024.05.01
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.24%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: nfs: fix UAF in direct writes In production we have been hitting the following warning consistently ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 17 PID: 1800359 at lib/refcount.c:28 refcount_warn_saturate+0x9c/0xe0 Workqueue: nfsiod nfs_direct_write_schedule_work [nfs] RIP: 0010:refcount_warn_saturate+0x9c/0xe0 PKRU: 55555554 Call Trace: <TASK> ? __warn+0x9f/0x130 ? refcount_warn_saturate+0x9c/0xe0 ? report_bug+0xcc/0x150 ? handle_bug+0x3d/0x70 ? exc_invalid_op+0x16/0x40 ? asm_ex...

Affected product and versions

Product
Linux Linux, SIMATIC S7-1500 TM MFP - GNU/Linux subsystem, linux kernel
Affected versions
>= af7cf057933f01dc7f33ddfb5e436ad598ed17ad < 6cd3f13aaa62970b5169d990e936b2e96943bc6a, >= af7cf057933f01dc7f33ddfb5e436ad598ed17ad < 4595d90b5d2ea5fa4d318d13f59055aa4bf3e7f5, >= af7cf057933f01dc7f33ddfb5e436ad598ed17ad < 80d24b308b7ee7037fc90d8ac99f6f78df0a256f, >= af7cf057933f01dc7f33ddfb5e436ad598ed17ad < 3abc2d160ed8213948b147295d77d44a22c88fa3, >= af7cf057933f01dc7f33ddfb5e436ad598ed17ad < e25447c35f8745337ea8bc0c9697fcac14df8605, >= af7cf057933f01dc7f33ddfb5e436ad598ed17ad < 1daf52b5ffb24870fbeda20b4967526d8f9e12ab, >= af7cf057933f01dc7f33ddfb5e436ad598ed17ad < cf54f66e1dd78990ec6b32177bca7e6ea2144a95, >= af7cf057933f01dc7f33ddfb5e436ad598ed17ad < 17f46b803d4f23c66cacce81db35fef3adb8f2af, >= 4.5, < 5.10.215, >= 5.11 < 5.15.154, >= 5.16 < 6.1.84, >= 6.2 < 6.6.24, >= 6.7 < 6.7.12, >= 6.8 < 6.8.3, 10.0
Fixed versions
5.10.215, 5.15.154, 6.1.84, 6.6.24, 6.7.12, 6.8.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, SIMATIC S7-1500 TM MFP - GNU/Linux subsystem, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416