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Fencer Intel
medium 4.7

CVE-2009-4895 json

Race condition in the tty_fasync function in drivers/char/tty_io.c in the Linux kernel before 2.6.32.6 allows local users to cause a denial…

published 16y ago modified 4mo ago also EUVD-2009-4858

cvss
4.7
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

Race condition in the tty_fasync function in drivers/char/tty_io.c in the Linux kernel before 2.6.32.6 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via unknown vectors, related to the put_tty_queue and __f_setown functions. NOTE: the vulnerability was addressed in a different way in 2.6.32.9.

Patch / fix

  • linux linux_kernel 2.6.32.6
  • kernel-rt enterprise mrg 1 2.6.24.7-149.el5rt
  • kernel-rt-trace enterprise mrg 1 2.6.24.7-149.el5rt
  • kernel-rt-vanilla enterprise mrg 1 2.6.24.7-149.el5rt
  • kernel-rt-debuginfo-common enterprise mrg 1 2.6.24.7-149.el5rt

red hat advisories RHSA-2010:0161

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-4895 updated cvss 4.9

kernel: tty->pgrp races

  • Red Hat MRG Realtime for RHEL 5 Server kernel-rt 2.6.24.7-149.el5rt, kernel-rt-trace 2.6.24.7-149.el5rt, kernel-rt-vanilla 2.6.24.7-149.el5rt, kernel-rt-debuginfo-common 2.6.24.7-149.el5rt
    fixed: vendor fix RHSA-2010:0161

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.7 AV:L/AC:M/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
  • CWE-476 NULL Pointer Dereference
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.