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RHSA-2026:39179

Vulnerability from csaf_opensuse - Published: 2026-07-14 00:00 - Updated: 2026-09-16 18:37
Summary
security update for kernel
Severity
Important
Notes
Title of the patch: security update for kernel
Description of the patch: This security update provides a functional equivalent of RHSA-2026:39179. The original Red Hat(R) advisory is available from the Red Hat web site at https://access.redhat.com/errata/RHSA-2026:39179.
Patchnames: RHSA-2026:39179
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
CVE-2026-46086
5.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H
Affected products
Product Identifier Version Remediation
Unresolved product id: SUSE Liberty Linux 8:bpftool-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-abi-stablelists-4.18.0-553.144.1.el8_10.noarch —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-core-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-cross-headers-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-debug-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-debug-core-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-debug-devel-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-debug-modules-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-debug-modules-extra-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-devel-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-doc-4.18.0-553.144.1.el8_10.noarch —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-headers-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-modules-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-modules-extra-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-tools-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-tools-libs-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:kernel-tools-libs-devel-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:perf-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:python3-perf-4.18.0-553.144.1.el8_10.x86_64 —
Vendor Fix
Threats
Impact moderate
CVE-2026-46116
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Recommended 20 products, the same list as for CVE-2026-46086
Threats
Impact important
CVE-2026-64600
7.8 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
Recommended 20 products, the same list as for CVE-2026-46086
Threats
Impact important
References
To clipboard 

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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: use a stable FDB dst snapshot in RCU readers\n\nLocal FDB entries can be rewritten in place by `fdb_delete_local()`, which\nupdates `f-\u003edst` to another port or to `NULL` while keeping the entry\nalive. Several bridge RCU readers inspect `f-\u003edst`, including\n`br_fdb_fillbuf()` through the `brforward_read()` sysfs path.\n\nThese readers currently load `f-\u003edst` multiple times and can therefore\nobserve inconsistent values across the check and later dereference.\nIn `br_fdb_fillbuf()`, this means a concurrent local-FDB update can change\n`f-\u003edst` after the NULL check and before the `port_no` dereference,\nleading to a NULL-ptr-deref.\n\nFix this by taking a single `READ_ONCE()` snapshot of `f-\u003edst` in each\naffected RCU reader and using that snapshot for the rest of the access\nsequence. Also publish the in-place `f-\u003edst` updates in `fdb_delete_local()`\nwith `WRITE_ONCE()` so the readers and writer use matching access patterns.",
          "title": "CVE description"
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      "title": "CVE-2026-46086"
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    {
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: defensively unhash xfrm_state lists in __xfrm_state_delete\n\nKASAN reproduces a slab-use-after-free in __xfrm_state_delete()\u0027s\nhlist_del_rcu calls under syzkaller load on linux-6.12.y stable\n(reproduced on 6.12.47, also reachable via the same code path on\ntorvalds/master and on the ipsec tree). Nine unique signatures cluster\nin the xfrm_state lifecycle, the load-bearing one being:\n\n  BUG: KASAN: slab-use-after-free in __hlist_del include/linux/list.h:990 [inline]\n  BUG: KASAN: slab-use-after-free in hlist_del_rcu include/linux/rculist.h:516 [inline]\n  BUG: KASAN: slab-use-after-free in __xfrm_state_delete net/xfrm/xfrm_state.c\n  Write of size 8 at addr ffff8881198bcb70 by task kworker/u8:9/435\n\n  Workqueue: netns cleanup_net\n  Call Trace:\n   __hlist_del / hlist_del_rcu\n   __xfrm_state_delete\n   xfrm_state_delete\n   xfrm_state_flush\n   xfrm_state_fini\n   ops_exit_list\n   cleanup_net\n\nThe other observed signatures hit the same slab object from\n__xfrm_state_lookup, xfrm_alloc_spi, __xfrm_state_insert and an OOB\nwrite variant of __xfrm_state_delete, all on the byseq/byspi\nhash chains.\n\n__xfrm_state_delete() guards its byseq and byspi unhashes with\nvalue-based predicates:\n\n\tif (x-\u003ekm.seq)\n\t\thlist_del_rcu(\u0026x-\u003ebyseq);\n\tif (x-\u003eid.spi)\n\t\thlist_del_rcu(\u0026x-\u003ebyspi);\n\nwhile everywhere else in the file (e.g. state_cache, state_cache_input)\nthe safer hlist_unhashed() check is used. xfrm_alloc_spi() sets\nx-\u003eid.spi = newspi inside xfrm_state_lock and then immediately inserts\ninto byspi, but a path that observes x-\u003eid.spi != 0 outside of\nxfrm_state_lock can still skip-or-hit the byspi unhash inconsistently\nwith whether x is actually on the list. The same holds for x-\u003ekm.seq\nversus byseq, and the bydst/bysrc unhashes have no predicate at all,\nso a second __xfrm_state_delete() on the same object writes through\nLIST_POISON pprev.\n\nThe defensive change here:\n\n  - Use hlist_del_init_rcu() instead of hlist_del_rcu() on bydst,\n    bysrc, byseq and byspi so a second deletion is a no-op rather\n    than a write through LIST_POISON pprev. The byseq/byspi nodes\n    are already initialised in xfrm_state_alloc().\n  - Test hlist_unhashed() rather than the value predicate for\n    byseq/byspi, so the unhash decision tracks list state rather than\n    mutable scalar fields.\n\nEmpirical verification: applied this patch on top of v6.12.47, rebuilt,\nand re-ran the same syzkaller harness for 1h16m on a previously-crashy\nconfiguration that produced ~100 hits each of slab-use-after-free\nRead in xfrm_alloc_spi / Read in __xfrm_state_lookup / Write in\n__xfrm_state_delete. After the patch, 7.1M execs across 32 VMs at\n~1550 exec/sec produced zero xfrm_state UAF/OOB hits. /proc/slabinfo\nconfirms the xfrm_state slab is actively allocated and freed during\nthe run (~143 KiB resident), so the fuzzer is still exercising those\ncode paths -- they just no longer crash.\n\nReproduction:\n\n  - Linux 6.12.47 x86_64 + KASAN_GENERIC + KASAN_INLINE + KCOV\n  - syzkaller @ 746545b8b1e4c3a128db8652b340d3df90ce61db\n  - 32 QEMU/KVM VMs x 2 vCPU on AWS c5.metal bare metal\n  - 9 unique signatures collected in ~9h, all within xfrm_state\n    lifecycle",
          "title": "CVE description"
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      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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      "threats": [
        {
          "category": "impact",
          "date": "2026-07-14T00:00:00Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-46116"
    },
    {
      "cve": "CVE-2026-64600",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-64600"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: resample the data fork mapping after cycling ILOCK\n\nxfs_reflink_fill_{cow_hole,delalloc} are both presented with an inode,\na data fork mapping, and a cow fork mapping.  Unfortunately, these two\nhelpers cycle the ILOCK to grab a transaction, which means that the\nmappings are stale as soon as we reacquire the ILOCK.  Currently we\nrefresh the cow fork mapping by re-calling xfs_find_trim_cow_extent, but\nwe don\u0027t refresh the data fork mapping beforehand, which means that the\nxfs_bmap_trim_cow in that function queries the refcount btree about the\nwrong physical blocks and returns an inaccurate value in *shared.\n\nIf *shared is now false, the directio write proceeds with a stale data\nfork mapping.  Fix this by querying the data fork mapping if the\nsequence counter changes across the ILOCK cycle.",
          "title": "CVE description"
        }
      ],
      "product_status": {
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        ]
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      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-64600",
          "url": "https://www.suse.com/security/cve/CVE-2026-64600"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1271526 for CVE-2026-64600",
          "url": "https://bugzilla.suse.com/1271526"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1271543 for CVE-2026-64600",
          "url": "https://bugzilla.suse.com/1271543"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
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      "scores": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
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      "threats": [
        {
          "category": "impact",
          "date": "2026-07-14T00:00:00Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-64600"
    }
  ]
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.