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Red Hat Product Errata RHSA-2026:9515 - Security Advisory
Issued:
2026-04-22
Updated:
2026-04-22

RHSA-2026:9515 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Moderate: kernel security update

Type/Severity

Security Advisory: Moderate

Red Hat Lightspeed patch analysis

Identify and remediate systems affected by this advisory.

View affected systems

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

  • kernel: net/sched: cls_u32: use skb_header_pointer_careful() (CVE-2026-23204)
  • kernel: kernel: Privilege escalation or denial of service via use-after-free in nf_tables_addchain() (CVE-2026-23231)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Affected Products

  • Red Hat Enterprise Linux for x86_64 - Extended Update Support Extension 8.8 x86_64
  • Red Hat Enterprise Linux Server - TUS 8.8 x86_64
  • Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.8 ppc64le
  • Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.8 x86_64

Fixes

  • BZ - 2439931 - CVE-2026-23204 kernel: net/sched: cls_u32: use skb_header_pointer_careful()
  • BZ - 2444376 - CVE-2026-23231 kernel: kernel: Privilege escalation or denial of service via use-after-free in nf_tables_addchain()

CVEs

  • CVE-2026-23204
  • CVE-2026-23231

References

  • https://access.redhat.com/security/updates/classification/#moderate
Note: More recent versions of these packages may be available. Click a package name for more details.

Red Hat Enterprise Linux for x86_64 - Extended Update Support Extension 8.8

SRPM
kernel-4.18.0-477.136.1.el8_8.src.rpm SHA-256: 7eeb2e1e34e1ae1bf6717c5cdadf4fd16674c11828c1e27b1ced9df650148829
x86_64
bpftool-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: de6427febcc2a049bbf907b3be86bbfd24ad1e08dab7982ace655a138db42ee1
bpftool-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: e1fd76493a9e88b1ad7a6bee3052cc4bce49edd5568718e4a53f82ad6b24cf2e
kernel-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 35a2491ffa2d88ddce794318422451f50dc17ee1a7c155eb8767d987b016ab31
kernel-abi-stablelists-4.18.0-477.136.1.el8_8.noarch.rpm SHA-256: 73cce08677e7adf88e3d200ce0291e1373cd36398ce45f0a6f0296d0f86cf12a
kernel-core-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 52a38eccb58077fbf030883cabaa35fe187a8b74e0c9198d72158bee0a390c91
kernel-cross-headers-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: c55c782f89ae1151d5a39d1e485fae1c991e24e929c8d447a965030780783bc9
kernel-debug-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 735c4f6555980a53e58e3cf66678c8f056a67521c65c3bb9a16a27da44ab2983
kernel-debug-core-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 2b18c12ca73544c3915c84d6dbd1a49c98bbf79d862bda05c4ae59c5ef964d06
kernel-debug-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: b6af409c7c9bee7dce261bbeedd1b796dbc81a90909a8505e62229da11242a55
kernel-debug-devel-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 2f5da9de413fa2dcdfb562dc41ae399bef06f12b91e985e691b52c60965e88b1
kernel-debug-modules-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 995abd036b23bd2fe3eec015f89868d54b64201f9c4151bbe48ae35f9e72fc44
kernel-debug-modules-extra-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 72779a4443371dff3dc8120ab4191432ecae17d68584a6a956db9112675a47c3
kernel-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 40001521e672bd7a9f6879202085bb967a2856bdfd15bf0cee2d4c1282eacf76
kernel-debuginfo-common-x86_64-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: d5edae962277694953a82b2d576919fa1dc036208ce9eaa86eee9b382d74e08e
kernel-devel-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 251992e671c8d8e5b6de833d9176dc3e74424bf255db5734bbbb59ff0f486a59
kernel-doc-4.18.0-477.136.1.el8_8.noarch.rpm SHA-256: 8b5df5b309d2dc16cde2352e8be677484e7c6ab171d660c0b944175d3a7ab51d
kernel-headers-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: ab5e782c0c93e50613874dcb9026604085357edc049f50e52c271e44208b41cd
kernel-modules-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 44084cb3352e525390189f7ec625429d01a951702e7f54e9595f704e41d42a30
kernel-modules-extra-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: c8c56139d3798ba572e3877e0d2bc7c0d8a16700ae8b7224ac5f22b016fa7521
kernel-tools-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 2f7cc92485e595c9db6b6f7512f5e6890e64dad432a337f7ffd1cce4f1856006
kernel-tools-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: c121c9fc91c63b150b2480dcb9544f0178adf3fa19f31880e6dd653d95c0c5a6
kernel-tools-libs-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 22cfdcef2b141ba0e1a2aa2c3e08997ae02465b699d39c16c4ae95c712c78167
perf-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 3db23bed6aed6318ca65c3f5c2ab896c56a9acd077b417687f28e49e2e710354
perf-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 51627b1ab31cc6c4ecdd63cf9f631a208dd14ff879c1c789cd17cf4d4d72e1e4
python3-perf-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: be3a5bf01f11fd0c4da9258734e9ae3f6cbe2974e57f7d3679399d991238f407
python3-perf-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 48f59c3f43805dcf6b079235865e3e4fd96b0e464de862a0aee536f899c43abf

Red Hat Enterprise Linux Server - TUS 8.8

SRPM
kernel-4.18.0-477.136.1.el8_8.src.rpm SHA-256: 7eeb2e1e34e1ae1bf6717c5cdadf4fd16674c11828c1e27b1ced9df650148829
x86_64
bpftool-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: de6427febcc2a049bbf907b3be86bbfd24ad1e08dab7982ace655a138db42ee1
bpftool-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: e1fd76493a9e88b1ad7a6bee3052cc4bce49edd5568718e4a53f82ad6b24cf2e
kernel-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 35a2491ffa2d88ddce794318422451f50dc17ee1a7c155eb8767d987b016ab31
kernel-abi-stablelists-4.18.0-477.136.1.el8_8.noarch.rpm SHA-256: 73cce08677e7adf88e3d200ce0291e1373cd36398ce45f0a6f0296d0f86cf12a
kernel-core-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 52a38eccb58077fbf030883cabaa35fe187a8b74e0c9198d72158bee0a390c91
kernel-cross-headers-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: c55c782f89ae1151d5a39d1e485fae1c991e24e929c8d447a965030780783bc9
kernel-debug-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 735c4f6555980a53e58e3cf66678c8f056a67521c65c3bb9a16a27da44ab2983
kernel-debug-core-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 2b18c12ca73544c3915c84d6dbd1a49c98bbf79d862bda05c4ae59c5ef964d06
kernel-debug-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: b6af409c7c9bee7dce261bbeedd1b796dbc81a90909a8505e62229da11242a55
kernel-debug-devel-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 2f5da9de413fa2dcdfb562dc41ae399bef06f12b91e985e691b52c60965e88b1
kernel-debug-modules-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 995abd036b23bd2fe3eec015f89868d54b64201f9c4151bbe48ae35f9e72fc44
kernel-debug-modules-extra-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 72779a4443371dff3dc8120ab4191432ecae17d68584a6a956db9112675a47c3
kernel-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 40001521e672bd7a9f6879202085bb967a2856bdfd15bf0cee2d4c1282eacf76
kernel-debuginfo-common-x86_64-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: d5edae962277694953a82b2d576919fa1dc036208ce9eaa86eee9b382d74e08e
kernel-devel-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 251992e671c8d8e5b6de833d9176dc3e74424bf255db5734bbbb59ff0f486a59
kernel-doc-4.18.0-477.136.1.el8_8.noarch.rpm SHA-256: 8b5df5b309d2dc16cde2352e8be677484e7c6ab171d660c0b944175d3a7ab51d
kernel-headers-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: ab5e782c0c93e50613874dcb9026604085357edc049f50e52c271e44208b41cd
kernel-modules-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 44084cb3352e525390189f7ec625429d01a951702e7f54e9595f704e41d42a30
kernel-modules-extra-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: c8c56139d3798ba572e3877e0d2bc7c0d8a16700ae8b7224ac5f22b016fa7521
kernel-tools-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 2f7cc92485e595c9db6b6f7512f5e6890e64dad432a337f7ffd1cce4f1856006
kernel-tools-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: c121c9fc91c63b150b2480dcb9544f0178adf3fa19f31880e6dd653d95c0c5a6
kernel-tools-libs-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 22cfdcef2b141ba0e1a2aa2c3e08997ae02465b699d39c16c4ae95c712c78167
perf-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 3db23bed6aed6318ca65c3f5c2ab896c56a9acd077b417687f28e49e2e710354
perf-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 51627b1ab31cc6c4ecdd63cf9f631a208dd14ff879c1c789cd17cf4d4d72e1e4
python3-perf-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: be3a5bf01f11fd0c4da9258734e9ae3f6cbe2974e57f7d3679399d991238f407
python3-perf-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 48f59c3f43805dcf6b079235865e3e4fd96b0e464de862a0aee536f899c43abf

Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.8

SRPM
kernel-4.18.0-477.136.1.el8_8.src.rpm SHA-256: 7eeb2e1e34e1ae1bf6717c5cdadf4fd16674c11828c1e27b1ced9df650148829
ppc64le
bpftool-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 86373c812f80646755c261272d15b5dc49f840ea265b5bc1279dbd711bc7d33c
bpftool-debuginfo-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 423b872c0cfaeeff11455bbcce62058758f8303baadccf8b8752a612fb17d533
kernel-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 26ab2cf80f0bab13123fcedeb99bb61b4e12a9da2dc5b967f584fd43941c4a33
kernel-abi-stablelists-4.18.0-477.136.1.el8_8.noarch.rpm SHA-256: 73cce08677e7adf88e3d200ce0291e1373cd36398ce45f0a6f0296d0f86cf12a
kernel-core-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 792979f1373556e041ab061985212faec822f0ff475e63b9e988d75a6decd0b2
kernel-cross-headers-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 30f695f78748046d814e1f91ae0e3912fe86b095443d975d2c44729601088b11
kernel-debug-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: c56cc69fadc5de6853fcf2432ce4079974e7bb33cb4c31d22f991819434fc5d4
kernel-debug-core-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 963f52bdd6894be9a57ba8f55c10bfd259f01f38298b7de06ef4c4ad32822c76
kernel-debug-debuginfo-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: b1cd160b7a22a25144323df65c1503288f51cec2b27feefa6290c0910d75a422
kernel-debug-devel-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 709acbb084173486c1a60fabe5f96e646acec512b6cac35bff7bd5e7952ac8dc
kernel-debug-modules-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 2954bebfd30ae757053a81e77fefe2ab832111cc8b5ababcdd9792dc97281150
kernel-debug-modules-extra-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 336ca7433f97a867566cdd9bf1cb358991c1ca95d9770ee6055976404711a64b
kernel-debuginfo-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 2c847dbe65422576f3ae389a66335126923e47155049a178a218fda44f1b7304
kernel-debuginfo-common-ppc64le-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 30ef2947b8132bef2efe881499464f96b2e81c295aaa561c7c08d9e4faf3baaa
kernel-devel-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 07b851df7aa06046cc2af821250e63339fa3eee1342cc293d2dc17b89bd7e8e4
kernel-doc-4.18.0-477.136.1.el8_8.noarch.rpm SHA-256: 8b5df5b309d2dc16cde2352e8be677484e7c6ab171d660c0b944175d3a7ab51d
kernel-headers-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: db4358e38d390a397725c325ca547d29f79ef095faa80ca0f3158e5bf2497c81
kernel-modules-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 03d2b1f2601d847363a9eb51fb1a3ce563302184765e2b8cfa780b7c08e4bbb0
kernel-modules-extra-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 5dbc00569a65d99bccfdf6b1857c77b21af6d3d23c2e3fcbfcae6a54befff646
kernel-tools-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: f068b3eb2eb60291dc1d42cb4ab2c13e208efdd4a8ef069b0e3c4edb08fae7e9
kernel-tools-debuginfo-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 1163f70364ddb3b98cf6db6fd867f614afe58884c40100a664ffae6b45632e31
kernel-tools-libs-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: d69235a0d99ab043c43bca5207b67cb83ebe5386cce9090d1db9e5aecbf547b9
perf-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: fc6d70a609a33726cac8e7d2e3a933742ecec3f3c305a0903b9024ffec7f4130
perf-debuginfo-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 3305115584c80a0920cfebb451aa9dae42da1ccfe7341e1b196d56bfdf785f8f
python3-perf-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: a4b8529c264a02f268b4c6fd57e5512fddab84392857a57748e4180e9113cae3
python3-perf-debuginfo-4.18.0-477.136.1.el8_8.ppc64le.rpm SHA-256: 512110e3ae7593366b04689f9f2478e1dba96d621f3985859ef4e807113ffd33

Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.8

SRPM
kernel-4.18.0-477.136.1.el8_8.src.rpm SHA-256: 7eeb2e1e34e1ae1bf6717c5cdadf4fd16674c11828c1e27b1ced9df650148829
x86_64
bpftool-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: de6427febcc2a049bbf907b3be86bbfd24ad1e08dab7982ace655a138db42ee1
bpftool-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: e1fd76493a9e88b1ad7a6bee3052cc4bce49edd5568718e4a53f82ad6b24cf2e
kernel-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 35a2491ffa2d88ddce794318422451f50dc17ee1a7c155eb8767d987b016ab31
kernel-abi-stablelists-4.18.0-477.136.1.el8_8.noarch.rpm SHA-256: 73cce08677e7adf88e3d200ce0291e1373cd36398ce45f0a6f0296d0f86cf12a
kernel-core-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 52a38eccb58077fbf030883cabaa35fe187a8b74e0c9198d72158bee0a390c91
kernel-cross-headers-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: c55c782f89ae1151d5a39d1e485fae1c991e24e929c8d447a965030780783bc9
kernel-debug-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 735c4f6555980a53e58e3cf66678c8f056a67521c65c3bb9a16a27da44ab2983
kernel-debug-core-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 2b18c12ca73544c3915c84d6dbd1a49c98bbf79d862bda05c4ae59c5ef964d06
kernel-debug-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: b6af409c7c9bee7dce261bbeedd1b796dbc81a90909a8505e62229da11242a55
kernel-debug-devel-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 2f5da9de413fa2dcdfb562dc41ae399bef06f12b91e985e691b52c60965e88b1
kernel-debug-modules-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 995abd036b23bd2fe3eec015f89868d54b64201f9c4151bbe48ae35f9e72fc44
kernel-debug-modules-extra-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 72779a4443371dff3dc8120ab4191432ecae17d68584a6a956db9112675a47c3
kernel-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 40001521e672bd7a9f6879202085bb967a2856bdfd15bf0cee2d4c1282eacf76
kernel-debuginfo-common-x86_64-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: d5edae962277694953a82b2d576919fa1dc036208ce9eaa86eee9b382d74e08e
kernel-devel-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 251992e671c8d8e5b6de833d9176dc3e74424bf255db5734bbbb59ff0f486a59
kernel-doc-4.18.0-477.136.1.el8_8.noarch.rpm SHA-256: 8b5df5b309d2dc16cde2352e8be677484e7c6ab171d660c0b944175d3a7ab51d
kernel-headers-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: ab5e782c0c93e50613874dcb9026604085357edc049f50e52c271e44208b41cd
kernel-modules-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 44084cb3352e525390189f7ec625429d01a951702e7f54e9595f704e41d42a30
kernel-modules-extra-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: c8c56139d3798ba572e3877e0d2bc7c0d8a16700ae8b7224ac5f22b016fa7521
kernel-tools-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 2f7cc92485e595c9db6b6f7512f5e6890e64dad432a337f7ffd1cce4f1856006
kernel-tools-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: c121c9fc91c63b150b2480dcb9544f0178adf3fa19f31880e6dd653d95c0c5a6
kernel-tools-libs-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 22cfdcef2b141ba0e1a2aa2c3e08997ae02465b699d39c16c4ae95c712c78167
perf-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 3db23bed6aed6318ca65c3f5c2ab896c56a9acd077b417687f28e49e2e710354
perf-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 51627b1ab31cc6c4ecdd63cf9f631a208dd14ff879c1c789cd17cf4d4d72e1e4
python3-perf-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: be3a5bf01f11fd0c4da9258734e9ae3f6cbe2974e57f7d3679399d991238f407
python3-perf-debuginfo-4.18.0-477.136.1.el8_8.x86_64.rpm SHA-256: 48f59c3f43805dcf6b079235865e3e4fd96b0e464de862a0aee536f899c43abf

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