In the Linux kernel, the following vulnerability has been resolved: btrfs: handle case when repair happens with dev-replace [BUG] There is a bug report that a BUG_ON() in btrfs_repair_io_failure() (originally repair_io_failure() in v6.0 kernel) got triggered when replacing a unreliable disk: BTRFS warning (device sda1): csum failed root 257 ino 2397453 off 39624704 csum 0xb0d18c75 expected csum 0x4dae9c5e mirror 3 kernel BUG at fs/btrfs/extent_io.c:2380! invalid opcode: 0000 [#1] PREEMPT SMP NOPTI CPU: 9 PID: 3614331 Comm: kworker/u257:2 Tainted: G OE 6.0.0-5-amd64 #1 Debian 6.0.10-2 Hardware name: Micro-Star International Co., Ltd. MS-7C60/TRX40 PRO WIFI (MS-7C60), BIOS 2.70 07/01/2021 Workqueue: btrfs-endio btrfs_end_bio_work [btrfs] RIP: 0010:repair_io_failure+0x24a/0x260 [btrfs] Call Trace: <TASK> clean_io_failure+0x14d/0x180 [btrfs] end_bio_extent_readpage+0x412/0x6e0 [btrfs] ? __switch_to+0x106/0x420 process_one_work+0x1c7/0x380 worker_thread+0x4d/0x380 ? rescuer_thread+0x3a0/0x3a0 kthread+0xe9/0x110 ? kthread_complete_and_exit+0x20/0x20 ret_from_fork+0x22/0x30 [CAUSE] Before the BUG_ON(), we got some read errors from the replace target first, note the mirror number (3, which is beyond RAID1 duplication, thus it's read from the replace target device). Then at the BUG_ON() location, we are trying to writeback the repaired sectors back the failed device. The check looks like this: ret = btrfs_map_block(fs_info, BTRFS_MAP_WRITE, logical, &map_length, &bioc, mirror_num); if (ret) goto out_counter_dec; BUG_ON(mirror_num != bioc->mirror_num); But inside btrfs_map_block(), we can modify bioc->mirror_num especially for dev-replace: if (dev_replace_is_ongoing && mirror_num == map->num_stripes + 1 && !need_full_stripe(op) && dev_replace->tgtdev != NULL) { ret = get_extra_mirror_from_replace(fs_info, logical, *length, dev_replace->srcdev->devid, &mirror_num, &physical_to_patch_in_first_stripe); patch_the_first_stripe_for_dev_replace = 1; } Thus if we're repairing the replace target device, we're going to trigger that BUG_ON(). But in reality, the read failure from the replace target device may be that, our replace hasn't reached the range we're reading, thus we're reading garbage, but with replace running, the range would be properly filled later. Thus in that case, we don't need to do anything but let the replace routine to handle it. [FIX] Instead of a BUG_ON(), just skip the repair if we're repairing the device replace target device.

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4892-1 advisory.

    The SUSE Linux Enterprise 12 SP5 kernel was updated to fix various security issues:

    The following security issues were fixed:

    - CVE-2023-54158: btrfs: don't free qgroup space unless specified (bsc#1256076).
    - CVE-2023-54180: btrfs: handle case when repair happens with dev-replace (bsc#1255995).
    - CVE-2025-68358: btrfs: fix racy bitfield write in btrfs_clear_space_info_full() (bsc#1255531).
    - CVE-2026-43299: btrfs: do not ASSERT() when the fs flips RO inside btrfs_repair_io_failure()     (bsc#1264851).
    - CVE-2026-63948: Bluetooth: L2CAP: fix chan ref leak in l2cap_chan_timeout() on !conn (bsc#1272670).
    - CVE-2026-63983: net: Introduce skb tc depth field to track packet loops (bsc#1273040).
    - CVE-2026-64012: net/sched: sch_sfb: Replace direct dequeue call with peek and qdisc_dequeue_peeked     (bsc#1273764).
    - CVE-2026-64280: fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region() (bsc#1273599).
    - CVE-2026-64422: net: ipv4: bound TCP reordering sysctl writes and MTU probe sizes (bsc#1273290).
    - CVE-2026-64456: hwrng: virtio: clamp device-reported used.len at copy_data() (bsc#1273288).
    - CVE-2026-64593: btrfs: do not trim a device which is not writeable (bsc#1274497).
    - CVE-2026-68106: drm/amdgpu: fix division by zero with invalid uvd dimensions (bsc#1274853).
    - CVE-2026-68233: drm/vc4: Shut down BO cache timer before teardown (bsc#1275644).
    - CVE-2026-68236: drm/amd/display: set new_stream to NULL after release (bsc#1275659).
    - CVE-2026-68303: drm/vc4: hvs/v3d: Fix null dereference in unbind (bsc#1275080).
    - CVE-2026-68323: tipc: serialize udp bearer replicast list updates (bsc#1274653).
    - CVE-2026-68430: drm/amdgpu/gfx8: drop unecessary BUG_ON() (bsc#1276273).
    - CVE-2026-72015: fs/resctrl: Fix double-add of pseudo-locked region's RMID to free list (bsc#1276791).
    - CVE-2026-72236: s390/perf_cpum_cf: Add missing array_index_nospec() to __hw_perf_event_init()     (bsc#1277614).
    - CVE-2026-72319: ipvs: ensure inner headers in ICMP errors are in headroom (bsc#1275964).
    - CVE-2026-72476: dmaengine: Fix possible use after free (bsc#1276844).
    - CVE-2026-72493: net: serialize netif_running() check in enqueue_to_backlog() (bsc#1276951).
    - CVE-2026-74408: wifi: ath9k: fix OOB access from firmware tx status queue ID (bsc#1276387).
    - CVE-2026-74544: net/sched: cls_u32: validate offshift to prevent shift-out-of-bounds (bsc#1277894).
    - CVE-2026-74578: crypto: algif_skcipher - force synchronous processing on trees without ctx->state     (bsc#1275564).
    - CVE-2026-74583: net/sched: cls_route: fix fastmap use-after-free on filter (bsc#1277889).
    - CVE-2026-74587: sctp: fix use-after-free of cached ASCONF chunk (bsc#1277821).
    - CVE-2026-74653: serial: 8250_of: clear stuck empty-FIFO RX-timeout on LPC32xx (bsc#1277310).
    - CVE-2026-74675: vt: stabilize tty reference in kbd_keycode with tty_port_tty_get (bsc#1278313).
    - CVE-2026-80977: net: skbuff: don't touch shared zerocopy state in skb_tx_error() (bsc#1280259).
    - CVE-2026-89542: SUNRPC: harden gss_krb5_unwrap_v2 against short tokens (bsc#1280387).
    - CVE-2026-89726: lib/ucs2_string.c: fix out-of-bounds read in ucs2_strnlen() (bsc#1281058).
    - CVE-2026-89778: isofs: fix out-of-bounds page array access on empty zisofs block (bsc#1280966).
    - CVE-2026-89987: mm/huge_memory: transfer the pmd dirty bit to the folio on zap (bsc#1281819).
    - CVE-2026-90011: scsi: target: iscsi: Reserve a terminator byte for the login payload (bsc#1281280).
    - CVE-2026-90283: hugetlbfs: release subpool on fill_super failure (bsc#1281771).
    - CVE-2026-93252: ocfs2: make ocfs2_set_acl() static (bsc#1282784).
    - CVE-2026-93287: i2c: smbus: reject oversized block transfers in the common path (bsc#1282744).
    - CVE-2026-93800: btrfs: fix use-after-free on reloc root after error in insert_dirty_subvol()     (bsc#1282808).
    - CVE-2026-93820: PCI: rockchip: Protect root bus removal with rescan lock (bsc#1282755).
    - CVE-2026-93822: PCI: iproc: Protect root bus removal with rescan lock (bsc#1282762).
    - CVE-2026-97416: btrfs: balance: fix potential bg lookup failure in btrfs_may_alloc_data_chunk()     (bsc#1282770).
    - CVE-2026-97491: net/rds: Don't sleep inside rds_ib_conn_path_shutdown (bsc#1283142).
    - CVE-2026-98010: net/sched: drr: clamp quantum in change class (bsc#1283823).
    - CVE-2026-98077: netfilter: nf_conntrack_sip: fix OOB read in sip_skip_whitespace() (bsc#1283979).
    - CVE-2026-98130: sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START (bsc#1283835).
    - CVE-2026-98252: RDMA/core: fix refcount bug in iwpm_get_nlmsg_request() (bsc#1284581).
    - CVE-2026-98269: btrfs: abort transaction on failure to update inode for hole punching and reflinking     (bsc#1284606).
    - CVE-2026-98347: IB/IPoIB: Avoid restoring OPER_UP after multicast flush (bsc#1284295).
    - CVE-2026-98354: RDMA/mad: Fix receive buffer leak when PKey enforcement fails (bsc#1284291).
    - CVE-2026-98357: IB/isert: wait for deferred control PDU completions before releasing the connection     (bsc#1284791).
    - CVE-2026-98358: IB/iser: reject a remote invalidation of an unregistered direction (bsc#1284289).
    - CVE-2026-98359: RDMA/core: Reject unregistering netdevs in ib_get_eth_speed (bsc#1284746).
    - CVE-2026-98365: RDMA/rxe: Fix integer overflow in mr_check_range() leading to OOB access (bsc#1284288).
    - CVE-2026-99999: ipv4: validate checksum_start before completing checksum (bsc#1285684).

    The following non security issues were fixed:

    - kernel-binary.spec.in: Emulate kabi.pl error when suse-kabi-tools is used.
    - net: add inline function skb_csum_is_sctp (bsc#1285684).
    - netfilter: nfnetlink_queue: unbreak SCTP traffic (bsc#1285684).
    - vc_screen: reload vc pointer before if (ret) in vcs_write() to avoid UAF (git-fixes).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - btrfs: handle case when repair happens with dev-replace [BUG] There is a bug report that a BUG_ON() in     btrfs_repair_io_failure() (originally repair_io_failure() in v6.0 kernel) got triggered when replacing a     unreliable disk: BTRFS warning (device sda1): csum failed root 257 ino 2397453 off 39624704 csum     0xb0d18c75 expected csum 0x4dae9c5e mirror 3 kernel BUG at fs/btrfs/extent_io.c:2380! invalid opcode: 0000     [#1] PREEMPT SMP NOPTI CPU: 9 PID: 3614331 Comm: kworker/u257:2 Tainted: G OE 6.0.0-5-amd64 #1 Debian     6.0.10-2 Hardware name: Micro-Star International Co., Ltd. MS-7C60/TRX40 PRO WIFI (MS-7C60), BIOS 2.70     07/01/2021 Workqueue: btrfs-endio btrfs_end_bio_work [btrfs] RIP: 0010:repair_io_failure+0x24a/0x260     [btrfs] Call Trace: <TASK> clean_io_failure+0x14d/0x180 [btrfs] end_bio_extent_readpage+0x412/0x6e0     [btrfs] ? __switch_to+0x106/0x420 process_one_work+0x1c7/0x380 worker_thread+0x4d/0x380 ?     rescuer_thread+0x3a0/0x3a0 kthread+0xe9/0x110 ? kthread_complete_and_exit+0x20/0x20     ret_from_fork+0x22/0x30 [CAUSE] Before the BUG_ON(), we got some read errors from the replace target     first, note the mirror number (3, which is beyond RAID1 duplication, thus it's read from the replace     target device). Then at the BUG_ON() location, we are trying to writeback the repaired sectors back the     failed device. The check looks like this: ret = btrfs_map_block(fs_info, BTRFS_MAP_WRITE, logical,     &map_length, &bioc, mirror_num); if (ret) goto out_counter_dec; BUG_ON(mirror_num != bioc->mirror_num);
    But inside btrfs_map_block(), we can modify bioc->mirror_num especially for dev-replace: if     (dev_replace_is_ongoing && mirror_num == map->num_stripes + 1 && !need_full_stripe(op) &&     dev_replace->tgtdev != NULL) { ret = get_extra_mirror_from_replace(fs_info, logical, *length,     dev_replace->srcdev->devid, &mirror_num, &physical_to_patch_in_first_stripe);
    patch_the_first_stripe_for_dev_replace = 1; } Thus if we're repairing the replace target device, we're     going to trigger that BUG_ON(). But in reality, the read failure from the replace target device may be     that, our replace hasn't reached the range we're reading, thus we're reading garbage, but with replace     running, the range would be properly filled later. Thus in that case, we don't need to do anything but let     the replace routine to handle it. [FIX] Instead of a BUG_ON(), just skip the repair if we're repairing the     device replace target device. (CVE-2023-54180)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
371818	SUSE SLES12: cluster-md-kmp-default / dlm-kmp-default / gfs2-kmp-default / etc (SUSE-SU-2026:4892-1)	Nessus	SuSE Local Security Checks	Local	medium
280720	Linux Distros Unpatched Vulnerability : CVE-2023-54180	Nessus	Misc.	Local	medium

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