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TI-2026-47923 Aliases CVE-2026-68143GHSA-7xg5-v5hr-7r34

net: slip: serialize receive against buffer reallocation

Priority LOW 35CWE-362Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 14 fixed, 3 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

In the Linux kernel, the following vulnerability has been resolved: net: slip: serialize receive against buffer reallocation sl_realloc_bufs() replaces rbuff and updates buffsize while holding sl->lock. slip_receive_buf() reads those fields and writes through rbuff without holding the lock. An MTU change can therefore race with receive processing. An MTU shrink can expose the new smaller rbuff with the old larger bound, causing an out-of-bounds write. A receive callback which already loaded the old rbuff can instead continue writing after that buffer has been freed. Serialize receive processing with sl_realloc_bufs() by holding sl->lock while consuming each receive batch.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00107 1st percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.265, 5.15.216, 6.1.183 +5Red Hat: 4 advisoriesRed Hat: 14 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux2.6.12 and later5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2Patch availableCNA
  • Linux VendorLinux Affected 2.6.12 and later Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*——Linux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2

Red Hat 4 advisories

  • RHSA-2026:68531 Released 2026-09-17 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.164.1.el8_10, kernel-4.18.0-553.164.1.el8_10, kernel-abi-stablelists-4.18.0-553.164.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.164.1.el8_10
  • RHSA-2026:68532 Released 2026-09-17 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-core-4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-debug-4.18.0-553.164.1.rt7.505.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-core-4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-debug-4.18.0-553.164.1.rt7.505.el8_10 +7
  • RHSA-2026:68507 Released 2026-09-17 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.56.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.56.1.el10_2, kernel-64k-devel-6.12.0-211.56.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.56.1.el10_2, kernel-64k-6.12.0-211.56.1.el10_2, kernel-64k-core-6.12.0-211.56.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.56.1.el10_2, libperf-6.12.0-211.56.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.56.1.el10_2, kernel-rt-64k-6.12.0-211.56.1.el10_2, kernel-rt-64k-core-6.12.0-211.56.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.56.1.el10_2, kernel-rt-core-6.12.0-211.56.1.el10_2, kernel-rt-debug-6.12.0-211.56.1.el10_2 +9
Show 1 more Red Hat advisories
  • RHSA-2026:67470 Released 2026-09-15 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.48.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.48.1.el9_8, kernel-64k-devel-5.14.0-687.48.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.48.1.el9_8, kernel-64k-5.14.0-687.48.1.el9_8, kernel-64k-core-5.14.0-687.48.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.48.1.el9_8, libperf-5.14.0-687.48.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.48.1.el9_8, kernel-rt-64k-5.14.0-687.48.1.el9_8, kernel-rt-64k-core-5.14.0-687.48.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.48.1.el9_8, kernel-rt-core-5.14.0-687.48.1.el9_8, kernel-rt-debug-5.14.0-687.48.1.el9_8 +9

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix yet
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:68507
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:67470
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:68507
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:68531
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:67470
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:68531
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:68507
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:67470
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:68532
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:68532
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:68507
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:67470
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:68507
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:67470
Not affected: 1 product
  • Red Hat Enterprise Linux for NVIDIA 26

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-68143
  2. 2026-10-03 Alias added: GHSA-7xg5-v5hr-7r34
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-20 Weakness changed · CISA ADP

References

Other 8

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
See all 21741 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences