CVE-2024-26739

high

Published 2024-09-24 · Modified 2024-11-03

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CVSS v3

—

CVSS v4 NEW

—

not yet in upstream

VIR risk

8.0

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: act_mirred: don't override retval if we already lost the skb If we're redirecting the skb, and haven't called tcf_mirred_forward(), yet, we need to tell the core to drop the skb by setting the retcode to SHOT. If we have called tcf_mirred_forward(), however, the skb is out of our hands and returning SHOT will lead to UaF. Move the retval override to the error path which actually need it.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Mitigation details

Source: Red Hat Errata — Red Hat Inc. · View original ↗ · Open-Errata-API

Description kernel: net/sched: act_mirred: don't override retval if we already lost the skb CVSS v3: 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) Errata / fixed releases ProductPackageAdvisoryReleased Red Hat Enterprise Linux 9kernel-0:5.14.0-427.37.1.el9_4RHSA-2024:69972024-09-24T00:00:00Z Red Hat Enterprise Linux 9kernel-0:5.14.0-427.37.1.el9_4RHSA-2024:69972024-09-24T00:00:00Z Red Hat…

Description

kernel: net/sched: act_mirred: don't override retval if we already lost the skb

CVSS v3: 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)

Errata / fixed releases

Product	Package	Advisory	Released
Red Hat Enterprise Linux 9	`kernel-0:5.14.0-427.37.1.el9_4`	RHSA-2024:6997	2024-09-24T00:00:00Z
Red Hat Enterprise Linux 9	`kernel-0:5.14.0-427.37.1.el9_4`	RHSA-2024:6997	2024-09-24T00:00:00Z
Red Hat Enterprise Linux 9.2 Extended Update Support	`kernel-0:5.14.0-284.75.1.el9_2`	RHSA-2024:4823	2024-07-24T00:00:00Z
Red Hat Enterprise Linux 9.2 Extended Update Support	`kernel-rt-0:5.14.0-284.75.1.rt14.360.el9_2`	RHSA-2024:4831	2024-07-24T00:00:00Z

Package state

Product	Package	State
Red Hat Enterprise Linux 6	`kernel`	Out of support scope
Red Hat Enterprise Linux 7	`kernel`	Out of support scope
Red Hat Enterprise Linux 7	`kernel-rt`	Out of support scope
Red Hat Enterprise Linux 8	`kernel`	Not affected
Red Hat Enterprise Linux 8	`kernel-rt`	Not affected
Red Hat Enterprise Linux 9	`kernel-rt`	Affected

Apply commands

bash fix

Apply RHSA-2024:6997 for Red Hat Enterprise Linux 9

yum update -y kernel
# or:
dnf upgrade -y kernel

Affected

Vendor	Product	Version
redhat	Red Hat Enterprise Linux 8	`Not affected`
redhat	Red Hat Enterprise Linux 8	`Not affected`
redhat	Red Hat Enterprise Linux 9	`Affected`

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

AlmaLinux Fixed 1 release

Version	Status	Fixed in
9	Fixed	`kernel-64k-devel-matched-5.14.0-427.37.1.el9_4.aarch64.rpm`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`6.7.7-1`
sid	Fixed	`6.7.7-1`
forky	Fixed	`6.7.7-1`
bullseye	Fixed	`5.10.244-1`
bookworm	Fixed	`6.1.137-1`

Red Hat Fixed 1 release

Version	Status	Fixed in
9	Fixed	—

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.